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"1. The whole animal with c, c, contractile vacuoles 2. Portion of periphery more magnified with a, four still pseudopodia and n, four nuclei or endoplasts. 3. A young actinosphærium."-Whitney, 1902

Actinosphærium

"1. The whole animal with c, c, contractile vacuoles 2. Portion of periphery more magnified with a,…

"Protozoa, common in all fresh water ponds and ditches."-Whitney, 1902

Amoeba

"Protozoa, common in all fresh water ponds and ditches."-Whitney, 1902

"Diagram showing an amoeba in successive stages of division." — Blaisedell, 1904

Amoeba

"Diagram showing an amoeba in successive stages of division." — Blaisedell, 1904

An illustration of the formation of the Cyclospora Cayetanensis egg-cell.

Formation of Cyclospora Cayetanensis Egg-cell

An illustration of the formation of the Cyclospora Cayetanensis egg-cell.

An illustration of the formation of the Cyclospora Cayetanensis egg-cell.

Formation of Cyclospora Cayetanensis Egg-cell

An illustration of the formation of the Cyclospora Cayetanensis egg-cell.

An illustration of the formation of the Cyclospora Cayetanensis egg-cell.

Formation of Cyclospora Cayetanensis Egg-cell

An illustration of the formation of the Cyclospora Cayetanensis egg-cell.

An illustration of the formation of the CCyclospora Cayetanensis spermatozooids

Formation of Cyclospora Cayetanensis Spermatozooids

An illustration of the formation of the CCyclospora Cayetanensis spermatozooids

An illustration of the growth of a Cyclospora Cayetanensis Spore in the nucleus.

Growth of Cyclospora Cayetanensis Spore in Nucleus

An illustration of the growth of a Cyclospora Cayetanensis Spore in the nucleus.

An illustration of the growth of spores of a Cyclospora Cayetanensis.

Formation of Cyclospora Cayetanensis Spores

An illustration of the growth of spores of a Cyclospora Cayetanensis.

An illustration of the growth of spores of a Cyclospora Cayetanensis.

Formation of Cyclospora Cayetanensis Spores

An illustration of the growth of spores of a Cyclospora Cayetanensis.

An illustration of the fertilization of the egg by the spermatozooids of a Cyclospora Cayetanensis.

Fertilization of Cyclospora Cayetanensis

An illustration of the fertilization of the egg by the spermatozooids of a Cyclospora Cayetanensis.

An illustration of the fusion of egg and sperm-nuclei of a Cyclospora Cayetanensis.

Fusion of Egg and Sperm-nuclei of Cyclospora Cayetanensis

An illustration of the fusion of egg and sperm-nuclei of a Cyclospora Cayetanensis.

These protozoans form colonies. A mature spherical colony of Eudorina.

Eudorina

These protozoans form colonies. A mature spherical colony of Eudorina.

These protozoans form colonies. Formation of the two kinds of reproductive cells of Eudorina.

Eudorina

These protozoans form colonies. Formation of the two kinds of reproductive cells of Eudorina.

An illustration of the formation of capsules about two sporoblasts of Cyclospora Cayetanensis.

Formation of Capsules about the Two Sporoblasts

An illustration of the formation of capsules about two sporoblasts of Cyclospora Cayetanensis.

Globigerina, a type of foraminiferan, has a kind of chalk-like shell.

Globigerina

Globigerina, a type of foraminiferan, has a kind of chalk-like shell.

These protozoans form colonies. Gonium pectorale colony seen from above.

Gonium

These protozoans form colonies. Gonium pectorale colony seen from above.

These protozoans form colonies. Gonium pectorale colony seen from the side.

Gonium

These protozoans form colonies. Gonium pectorale colony seen from the side.

"Gregarina, contents divided into pseudo-navicellae. GREGARINIDAE. A family or other major group of endoplastic protozoans, having spheroidal, ovoid, or elongated bodies, sometimes with a segmental constriction, and occasionally one end of the body beaked with an epimerite bearing curved horny spines." -Whitney, 1911

Gregarina

"Gregarina, contents divided into pseudo-navicellae. GREGARINIDAE. A family or other major group of…

"Gregarina, contents divided into pseudo-navicellae. GREGARINIDAE. A family or other major group of endoplastic protozoans, having spheroidal, ovoid, or elongated bodies, sometimes with a segmental constriction, and occasionally one end of the body beaked with an epimerite bearing curved horny spines." -Whitney, 1911

Gregarina

"Gregarina, contents divided into pseudo-navicellae. GREGARINIDAE. A family or other major group of…

"Gregarina, free pseudo-navicellae. GREGARINIDAE. A family or other major group of endoplastic protozoans, having spheroidal, ovoid, or elongated bodies, sometimes with a segmental constriction, and occasionally one end of the body beaked with an epimerite bearing curved horny spines." -Whitney, 1911

Gregarina

"Gregarina, free pseudo-navicellae. GREGARINIDAE. A family or other major group of endoplastic protozoans,…

"Gregarina of Earthworm, encysted. GREGARINIDAE. A family or other major group of endoplastic protozoans, having spheroidal, ovoid, or elongated bodies, sometimes with a segmental constriction, and occasionally one end of the body beaked with an epimerite bearing curved horny spines." -Whitney, 1911

Gregarina Encysted

"Gregarina of Earthworm, encysted. GREGARINIDAE. A family or other major group of endoplastic protozoans,…

"Gregarina of Earthworm. GREGARINIDAE. A family or other major group of endoplastic protozoans, having spheroidal, ovoid, or elongated bodies, sometimes with a segmental constriction, and occasionally one end of the body beaked with an epimerite bearing curved horny spines." -Whitney, 1911

Gregarina of Earthworm

"Gregarina of Earthworm. GREGARINIDAE. A family or other major group of endoplastic protozoans, having…

"Gregarina, their free amoebiform contents. GREGARINIDAE. A family or other major group of endoplastic protozoans, having spheroidal, ovoid, or elongated bodies, sometimes with a segmental constriction, and occasionally one end of the body beaked with an epimerite bearing curved horny spines." -Whitney, 1911

Amoebiform Gregarina

"Gregarina, their free amoebiform contents. GREGARINIDAE. A family or other major group of endoplastic…

These protozoans form colonies. Pandorina colony colony seen from above.

Pandorina

These protozoans form colonies. Pandorina colony colony seen from above.

These protozoans form colonies. Pandorina cells just fused.

Pandorina

These protozoans form colonies. Pandorina cells just fused.

These protozoans form colonies. Pandorina cells completely fused.

Pandorina

These protozoans form colonies. Pandorina cells completely fused.

Polystomella are grouped in the Bryozoan Phylum.

Polystomella

Polystomella are grouped in the Bryozoan Phylum.

Gregarina, a protozoan, various species which live in the alimentary canal of crayfishes, centipeds, and certain insects. is is a parasite living at the expense of the host in whose whose body it lives in. This is a Gregarinid (Actinocephalus oligacanthus) from the intestine of an insect.

Protozoan

Gregarina, a protozoan, various species which live in the alimentary canal of crayfishes, centipeds,…

Gregarina, a protozoan, various species which live in the alimentary canal of crayfishes, centipeds, and certain insects. It is a parasite living at the expense of the host in whose whose body it lives in. This is a spore forming by a Gregarinid (Cocidium oviforme) from the liver of a guinea-pig.

Protozoan

Gregarina, a protozoan, various species which live in the alimentary canal of crayfishes, centipeds,…

Gregarina, a protozoan, various species which live in the alimentary canal of crayfishes, centipeds, and certain insects. It is a parasite living at the expense of the host in whose whose body it lives in. This is a spore forming by a Gregarinid (Cocidium oviforme) from the liver of a guinea-pig.

Protozoan

Gregarina, a protozoan, various species which live in the alimentary canal of crayfishes, centipeds,…

Gregarina, a protozoan, various species which live in the alimentary canal of crayfishes, centipeds, and certain insects. It is a parasite living at the expense of the host in whose whose body it lives in. A stage in the conjugation and spore forming of Gregarina polymopha.

Protozoan

Gregarina, a protozoan, various species which live in the alimentary canal of crayfishes, centipeds,…

Gregarina, a protozoan, various species which live in the alimentary canal of crayfishes, centipeds, and certain insects. It is a parasite living at the expense of the host in whose whose body it lives in. A stage in the conjugation and spore forming of Gregarina polymopha.

Protozoan

Gregarina, a protozoan, various species which live in the alimentary canal of crayfishes, centipeds,…

Gregarina, a protozoan, various species which live in the alimentary canal of crayfishes, centipeds, and certain insects. It is a parasite living at the expense of the host in whose whose body it lives in. A stage in the conjugation and spore forming of Gregarina polymopha.

Protozoan

Gregarina, a protozoan, various species which live in the alimentary canal of crayfishes, centipeds,…

"Their bodies consist either of aa simple elementary cell, with its contents, or of an aggregation of several of these cells; each, however, still appearing to retain its independent existence. They are generally of a very minute size, and only to be observed with the microscope." — Goodrich, 1859

Protozoans

"Their bodies consist either of aa simple elementary cell, with its contents, or of an aggregation of…

Radiolarians exhibit a wide variey of shapes. They have a glassy skeleton.

Radiolaria

Radiolarians exhibit a wide variey of shapes. They have a glassy skeleton.

An illustration of the liberation of Cyclospora Cayetanensis spores.

Liberation of Spores

An illustration of the liberation of Cyclospora Cayetanensis spores.

These protozoans form colonies. The large spherical colonies of Volvox globator are composed of several thousand cells around a hollow center.

Volvox

These protozoans form colonies. The large spherical colonies of Volvox globator are composed of several…

These protozoans form colonies. The large spherical colonies of Volvox globator are composed of several thousand cells around a hollow center. This is a type of reproductive cell.

Volvox

These protozoans form colonies. The large spherical colonies of Volvox globator are composed of several…

An illustration of the division of a zygote of Cyclospora Cayetanensis into two sporoblasts.

Division of Zygote

An illustration of the division of a zygote of Cyclospora Cayetanensis into two sporoblasts.