. Fresh-water biology. Freshwater biology. THE FREE-LIVING FLATWORMS (TURBELLARIA) 3SI 70 (67) With atrial copulatory apparatus. Castrada hofmanni (M. Braun) 1885. Length mm. Unpigmented. Colored green from zoocUo- rellae in mesenchyma. Cylindrical. Anterior end rounded, pos- terior end running out to a blunt point. Without eyes. Large rhabdoids in tracts. Pharynx somewhat before the middle of the body with genital pore shortly back of it. Testes are elon- gated oval to pear-shaped. Yolk glands are deeply lobed. The male copulatory organ and bursa copulatrix are entirely enclosed by the mu
. Fresh-water biology. Freshwater biology. THE FREE-LIVING FLATWORMS (TURBELLARIA) 3SI 70 (67) With atrial copulatory apparatus. Castrada hofmanni (M. Braun) 1885. Length mm. Unpigmented. Colored green from zoocUo- rellae in mesenchyma. Cylindrical. Anterior end rounded, pos- terior end running out to a blunt point. Without eyes. Large rhabdoids in tracts. Pharynx somewhat before the middle of the body with genital pore shortly back of it. Testes are elon- gated oval to pear-shaped. Yolk glands are deeply lobed. The male copulatory organ and bursa copulatrix are entirely enclosed by the muscular mantle of the atrium copidatorium. Rochester, N. Y. Fig. 623. Castrada hofmanni. Cirrus, bursa copulatrix, and atrium copulatorium. Diagram from preparations subjected to pressure: vs, vesicula seminalis; ks^ granular secretions; sp, spermatophore; rm, cir- cular muscles; /, teeth-like spines; ac, atrium copulatorium; de, ductus ejaculatorius. Much enlarged. (After Luther.) tbi.\. 71 (64) Testes dorsal or lateral to the yolk glands. Mesenchyma with rhabdoids outside of tracts. Tribe Mesostomatini . 72 Sexual pore lies in anterior two-thirds of body. Protonephridial ducts open through mouth to exterior as in most Typhloplanini and in some cases, mouth, protonephridia, and genital organs have a common external opening. Rhabdites play a very important part in classi- fication. The larger rhabdocoels belong to this group. 72 (73) With a ventral epidermal pouch and a ductus spermaticus which connects the bursa copulatrix with the female genital canal. Bothromesostoma. Only one species known in this country. Bothromesostoma personatum (O. Schmidt) 1848. Length 7 mm. Color on anterior and posterior ends and on lateral margins and ventral side a clear brown. In mature specimens the pigment is so massed that together with the dark color of the intestine it gives a dark brown to bluish-black color to the dorsal surface above the intestine. Some specimens show a mixture of brown an
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
