OCR Text |
Show each bears some five sessile spherical vesicles, which are non-muscular. The cells lining the walls of these vesicles project inwards, so that the vesicle is almost entirely filled up with a reticulum of protoplasmic material which contains numerous well-defined vacuoles ; in these coils of spermatozoa lie, and in two cases sperm-coils are seen passing between the uterus and a vesicle. Traunfelsia is altogether a remarkable form, but undoubtedly is most closely allied to Diposthus. Special features to which attention should be directed are, the presence of marginal tentacles combined with very elongated body; the remarkable pair of compound glands developed in connection with the terminal parts of the male ducts; and, thirdly, the coexistence of an accessory vesicle opening on the vagina with uterine glands along the course of the uteri. The genus shows affinities to Diposthus in the central position of the pharynx and in the structure of the genital glands, particularly in the possession of an intromittent muscular prostatic organ. It bears to Diposthus much the same relationship as Disparoplana does to Planocera, and should perhaps be made the type of a subfamily of the Diposthiidse. The genus Traunfelsia may be defined as follows:- A genus of the Diposthiidce o f a very elongated form. A pair of marginal tentacles present which bear no eye-spots. Eye-spots lie on the anterior margin and over the brain. Pharynx subcentral. Testes and ovaries dorsal. In addition to the penis and intromittent prostate ivhich lies behind it, there is a pair o f glandular structures opening on the ventral surface on either side o f the penial aperture. Female apparatus provided both with accessory vesicle and with uterine vesicles. iii. L it e r a t u r e . 1884. L a n g , A.-Fauna und Fora des Golfes von Neapel. xi. Polycladen. Leipzig, 1884. 1888. V e r r i l l , A. E.-" The Marine Planarians o f New England." Trans. Connect. Acad. viii. pp. 459-520, pis. 40-44. 1892. G r a f f , L. von.-" Pelagische Polycladen." Zeitsclir. f. wiss. Zool. vol. lv. pp. 189-220, pis. 7-10. 1892. 1893. G am b l e , F. W.-" British Marine Turbellaria." Q. J. M. S. xxxiv. pp. 433-515, pis. 10-12. 1893. 1895. S tum m er -T r a u n f e l s , R. von.-" Tropische Polycladen." Zeitschr. f. wiss. Zool. lx. pp. 689-725, pis. 35-37. 1895. 1896. P l e i in , M.-" Neue Polycladen." Jena. Zeitschr. xxx. pp. 137-176, pis. 8-13. 1895-1896. 1902. L a id l a w , F. F.-" The Marine Turbellaria" in Gardiner's ‘ Fauna and Geography of the Maldive and Laccadive Archipelagoes,' i. 3, pp. 282-311, pis. 14, 15. 1902. 1903 . . " A Collection of Polyclad Turbellaria from the Straits of Malacca (Skeat Expedition)." P. Z S 1903 i pp. 301-318, pi. 23. 7 1 8 POLYCLAD TURBELLARIA OF THE CAPE VERDE ISLANDS. [J u n e 19, |