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"Hydra vividis. ov, ovary; te, testis." — Encyclopedia Britannica, 1893

Hydra Vividis

"Hydra vividis. ov, ovary; te, testis." — Encyclopedia Britannica, 1893

From a section of the testis of a dog, showing portions of seminal tubes. A, seminal epithelial cells, and numerous small cells loosely arranged; B, the small cells or spermatoblasts converted into spermatozoa; groups of these is a further stage of development.

Testis of a Dog, Section of the

From a section of the testis of a dog, showing portions of seminal tubes. A, seminal epithelial cells,…

This is a diagram of transverse section of a Turbellarian through the region of the mouth. d.m., dermo-muscular wall containing longitudinal fibres; ex, excretory system; f, flame cells; g, gut; l.c., lateral nerve cord; m, mouth; m.f., muscle fibres; ph., pharynx; t, testis; u, uterus; y, yolk glands.

Turbellarian

This is a diagram of transverse section of a Turbellarian through the region of the mouth. d.m., dermo-muscular…