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"The Foraminifera are enclosed in minute calcareous shells, early invisible to the naked eye; they are found among the sands of the sea. The, in common with corals, are great agents in helping to form islands, which rise out of the bosom of the deep in the warm regions of the globe."

Alveolina Ovoidea (d'Orbigny)

"The Foraminifera are enclosed in minute calcareous shells, early invisible to the naked eye; they are…

"These little creatures frequently have the appearance of small, rounded masses, like drops of water. They are naked, without any apparent organization."

Amoeba Princeps (Ehrenberg)

"These little creatures frequently have the appearance of small, rounded masses, like drops of water.…

"The Foraminifera are enclosed in minute calcareous shells, early invisible to the naked eye; they are found among the sands of the sea. The, in common with corals, are great agents in helping to form islands, which rise out of the bosom of the deep in the warm regions of the globe."

Calcarina Calcitrpoides (Lamarck)

"The Foraminifera are enclosed in minute calcareous shells, early invisible to the naked eye; they are…

One group will take the spherical form and produce a shell in the shape of the nautilus. In this case, the shell is spiral, with the chamber equilateral, with a larger and smaller side.

Cassidulina Laevigata

One group will take the spherical form and produce a shell in the shape of the nautilus. In this case,…

"The shell advances beyond this simple type by a process of linear budding, the first cell being spherical, with an opening through which a second segment is formed, generally a little larger than the first. This new growth is followed by others developed in the same way, until the organism attains its maturity."

Dentalina Subarcuata

"The shell advances beyond this simple type by a process of linear budding, the first cell being spherical,…

"This is the most common species of the <em>Euglenia</em>, and is among the most widely diffused of all the Infusioria. It is this animalcule which is often met with covering stagnant pools with a floating surface of green."

Euglena Viridis

"This is the most common species of the Euglenia, and is among the most widely diffused of…

"The Foraminifera are enclosed in minute calcareous shells, early invisible to the naked eye; they are found among the sands of the sea. The, in common with corals, are great agents in helping to form islands, which rise out of the bosom of the deep in the warm regions of the globe."

Fabularia Discolithus (Defrance)

"The Foraminifera are enclosed in minute calcareous shells, early invisible to the naked eye; they are…

The body is enclosed in a glassy shell composed of flint. The shell is perforated by numerous holes through which the pseudopodia are emitted, and it is usually of extreme beauty, being sculptured in various ways, and often adorned with spines.

Haliomma Hexacanthum

The body is enclosed in a glassy shell composed of flint. The shell is perforated by numerous holes…

Related to the Paramecians. These are remarkable for their size and voracity; they sometimes attain the length of a twelfth of an inch.

Kondylostoma Patens

Related to the Paramecians. These are remarkable for their size and voracity; they sometimes attain…

"The Monads are infusorial animalcules which make an early appearance in vegetable infusions. They have no skin; the substance of their bodies can shorten itself or draw itself out more or less; their organization is extremely simple."

Monas Lens

"The Monads are infusorial animalcules which make an early appearance in vegetable infusions. They have…

One group will take the spherical form and produce a shell in the shape of the nautilus. In this case, the external convolutions conceal those previously formed.

Nummulina Perforta

One group will take the spherical form and produce a shell in the shape of the nautilus. In this case,…

One group will take the spherical form and produce a shell in the shape of the nautilus. In this case, all the convolutions are visible.

Operculina

One group will take the spherical form and produce a shell in the shape of the nautilus. In this case,…

In this image, (a) represents the parasites in the various stages of development, and (b), the larger animalcule on which they have established themselves.

Paramecium Aurelia and its Parasites

In this image, (a) represents the parasites in the various stages of development, and (b), the larger…

"Paramecium Bursaria is the only species of Paramecium that forms symbiotic relationships with algae, and are often used in biology classrooms as examples of protozoans, and as examples of symbiosis."

Paramecium Bursaria (Pritchard)

"Paramecium Bursaria is the only species of Paramecium that forms symbiotic relationships with algae,…

"The singular phenomenon of spontaneous division may be witnessed by any one having patience to examine the creature long enough under the microscope, isolated from its innumerable companions. This process is represented here, A and B being the adult, C the same in course of separation, D after its completion."

Propagation of an Infusorian by Spontaneous Division

"The singular phenomenon of spontaneous division may be witnessed by any one having patience to examine…

One group will take the spherical form and produce a shell in the shape of the nautilus. Some are more or less oblong, each new segment being nearly equal to the entire length of the shell.

Rotalia

One group will take the spherical form and produce a shell in the shape of the nautilus. Some are more…

One group will take the spherical form and produce a shell in the shape of the nautilus. Some are more or less oblong, each new segment being nearly equal to the entire length of the shell.

Spiroloculina Depressa

One group will take the spherical form and produce a shell in the shape of the nautilus. Some are more…

"The pores of sponges are of two kinds, the larger ones called 'oscula'" and the smaller distinguished as 'pores.' In the living state of the sponge, water is being constantly absorbed by the pores, while currents of water will be seen issuing from the oscula."

Sponge Attached to its Rocky Bed

"The pores of sponges are of two kinds, the larger ones called 'oscula'" and the smaller distinguished…

One group will take the spherical form and produce a shell in the shape of the nautilus. In this case, the new segments are arranged alternately on opposite sides of the central line.

Textularia Variabilis

One group will take the spherical form and produce a shell in the shape of the nautilus. In this case,…

"The common Volvox is found in great abundance during the summer, and even in the depth of winter in lakes and ponds of fresh water."

Volvox Globular

"The common Volvox is found in great abundance during the summer, and even in the depth of winter in…

"The common Volvox is found in great abundance during the summer, and even in the depth of winter in lakes and ponds of fresh water."

Volvox Globular

"The common Volvox is found in great abundance during the summer, and even in the depth of winter in…