The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . Fig. 28.—The shell and operculum of Tanganyiciarufofilosa. not all, the shells of the true Naticas. In the generalarrangement of the parts within the mantle cavity, thecharacter of the snout, head, and tentacles, in the positionof the renal, reproductive, and alimentary apertures, and inthe character of its gill, this animal (Fig. 29) very muchresembles Typhobia ; the osphradium is, however, somewhatfoliated at its outer end, and in the female the rectum isprovided wit
The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . Fig. 28.—The shell and operculum of Tanganyiciarufofilosa. not all, the shells of the true Naticas. In the generalarrangement of the parts within the mantle cavity, thecharacter of the snout, head, and tentacles, in the positionof the renal, reproductive, and alimentary apertures, and inthe character of its gill, this animal (Fig. 29) very muchresembles Typhobia ; the osphradium is, however, somewhatfoliated at its outer end, and in the female the rectum isprovided with a large rectal gland. In both sexes thegenital aperture is placed farther back than in any of thepreceding forms, and in the male we encounter, for the firsttime among the halolimnic gastropods, an unmistakable THE TANGANYIKA PROBLEM. 247 spermatic groove (Fig. 29) running from the opening ofthe genital duct along the body and on to the foot below. Fig. 29.—Semi diagram of the anatomy of Tangcuiyicia mantle opened from above, and the nerves in black ;ayst. s., crystalline style.; St., stomach ; b. p., brood pouch. the tentacles on the right side, just as it does in Strombus,Pteroceras, or Littorina. In the female Tanganyicia thisgenital groove is also present, and leads from the genital 248 THE TANGANYIKA PROBLEM. aperture to a small opening below the left eye. Theopening communicates with a canal, and the canal passes
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectm, booksubjectzoology
