718 POLYCLAD TURBELLARIA OF THE CAPE VERDE ISLANDS. [Juiie 19, 



each bears some five sessile spherical vesicles, which are non- 

 muscular. The cells lining the walls of these vesicles j^roject 

 inwards, so that the vesicle is almost entirely filled up with a 

 reticulum of protoplasmic matei-ial 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 Dipostlixis in the central position 

 of the pharynx and in the structure of the genital glands, 

 particularly in the possession of an intromittent muscular pro- 

 static organ. It bears to Divostlius much the same relationship 

 as Disparoplana does to Planocera, and should perhaps be made 

 the type of a subfamily of the Diposthiidse. 



The genus Traimfelsia may be defined as follows : — 



A genus of the Diposthiidce of a very elongated form. A pair 

 of margioial tentacles present which, hear no eye-spots. Eye-sp>ots 

 lie on the anterior margin and over the brain. Pharynx suhcentral. 

 Testes and ovaries dorsal. In addition to the penis and intromittent 

 prostate which lies behind it, there is a pair of glandtdar structures 

 opening on the ventral surface on either side of the penial aperture. 

 Female apparatus provided both with accessory vesicle and with 

 uterine vesicles. 



iii. Literature. 



1884. Lang, A. — Fauna und. Fora des Golfes von Neapel. xi. 



Polycladen. Leipzig, 1884. 

 1888. Yerrill, a. E. — "The Marine Planarians of New England." 



Trans. Connect. Acad. viii. pp. 459-520, pis. 40-44. 



1892, Graff, L. von. — " Pelagische Polycladen." Zeitschr. f. wiss. 



Zool. vol. Iv. pp. 189-220, pis. 7-10. 1892. 



1893. Gamble, F.W.—" British Marine Turbellaria." Q.J. M.S. 

 xxxiv. pp. 433-515, pis. 10-12. 1893. 



1895. Stummer-Traunfels, R. von. — " Tropische Polycladen." 

 Zeitschr. f. wiss. Zool. Ix. pp. 689-725, pis. 35-37. 1895. 



1896. Plehn, M. — "Neue Polycladen." Jena. Zeitschr. xxx. 



pp. 137-176, pis. 8-13. 1895-1896. 

 1902. Laidlaw, 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 Poly clad Turbellaria fi-om the 



Straits of Malacca (Skeat Expedition)." P. Z. S. 1903, i. 



pp. 301-318, pi. 23. 



