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This illustration shows the features in the life history of Chlamydomonas: A, character of the motile plant. B, conjugation of isogamous gametes. C, a plant dividing to form numerous small male gametes. D, a plant forming two large female gametes. E, male and female gametes about to conjugate.

Chlamydomonas

This illustration shows the features in the life history of Chlamydomonas: A, character of the motile…

"Life history of Monocystis. 1. Young Gregarine lying within a sperm mother cell of earthworm. 2. Association of two Gregarines within a cyst, ready to form gametes. 3. Numerous spore-cases (sp.c., pseudonavicellae) within a cyst. 4. A spore-case with eight spores (sp.) and a residual core (rb)." -Thomson, 1916

Monocystis

"Life history of Monocystis. 1. Young Gregarine lying within a sperm mother cell of earthworm. 2. Association…

This illustration shows the features in the life history of Pandorina: A, a colony of plants. B, each plant of the colony dividing to form a new colony. C, the plants of a colony escaping as gametes. D, the conjugation of two gametes of unequal size. E, later stage in the conjugation. F, gametospore or resting spore. G, Large zoospore formed from the gametospore. H, a colony formed by the division of the zoospore, G.

Pandorina

This illustration shows the features in the life history of Pandorina: A, a colony of plants. B, each…

This illustration shows a diagram of the life history of Ricciocarpus. The upper portion of the figure represents the sexual generation and the lower portion, the asexual. The former generation begins with the formation of the spores, sp, from the mother-cell and ends with the formation of the gametes, g. The asexual generation begins with the gametospore, gm, and ends with the spore mother cells, sm.

Ricciocarpus

This illustration shows a diagram of the life history of Ricciocarpus. The upper portion of the figure…

"Spermatozoa of domestic cock, greatly magnified." The spermatozoam or seminal animalcules, or male Dynamamaebae (figs. 106, 107), are the exact counterparts of ovarian ova, in so far as they are single-celled animals of a very low grade of organization; but their activity and intelligence is marvelousm and still more so is the mysterious attribute with which they are endowed of assimilating their protoplasmic substance with that of the ovum; with the result that thus fecundated ovum is capable of procreating itself by fission for a period until a mass of similar creates in engendered; from which mass is then speedily evolved the complex body the bird." Elliot Coues, 1884

Rooster Seman

"Spermatozoa of domestic cock, greatly magnified." The spermatozoam or seminal animalcules, or male…

"Spermatozoa of domestic cock, greatly magnified." The spermatozoam or seminal animalcules, or male Dynamamaebae (figs. 106, 107), are the exact counterparts of ovarian ova, in so far as they are single-celled animals of a very low grade of organization; but their activity and intelligence is marvelousm and still more so is the mysterious attribute with which they are endowed of assimilating their protoplasmic substance with that of the ovum; with the result that thus fecundated ovum is capable of procreating itself by fission for a period until a mass of similar creates in engendered; from which mass is then speedily evolved the complex body the bird." Elliot Coues, 1884

Sparrow Seman

"Spermatozoa of domestic cock, greatly magnified." The spermatozoam or seminal animalcules, or male…