160 J. B. S. MOOEE. 



Reproductive Apparatus. 



In the female Tanganyikia rufofilosa the whole ar- 

 rangement of the genital apparatus is most interesting, and 

 there is little doubt that in both sexes of this species we are 

 dealing with one of the most archaic types of reproductive 

 apparatus that any of the Gastropods possess. The genital 

 gland is situated on the upper surface of the apical body-whorls, 

 and in the male (PL 14, fig. 4) it is united by a number of 

 small ducts to a rather long but not greatly coiled vas deferens, 

 which passes beneath the intestine, and opens by a fine aperture 

 immediately below the rectum (fig. 4, v. d.). Beyond this 

 aperture, in some male specimens, I was able to trace a fine 

 groove running forward along the lateral wall of the body, 

 and dying out beneath the eye (fig. 2, g. v.); while in others 

 this groove, which is well known in the males of several 

 Gastropods, was not to be found. Such grooves are known 

 to exist in the males of various representatives of the Struthio- 

 laridse, and many other forms. In the Strombidae and Litto- 

 rinidse they are to be traced in both the male and female. 



In the female T. rufofilosa the ovary lies in the same posi- 

 tion as the testis in the male (PI. 14, fig. 10), and the ova are 

 collected by a number of small channels into a common long 

 non-convoluted oviduct (PI. 14, fig. 10, g. d.). 



The aperture of the oviduct is somewhat further forward in 

 the female than the corresponding opening in the male; and I 

 was surprised to find that the aperture of the oviduct in T. 

 rufofilosa is always related to a very strongly marked furrow 

 which runs forward in the same position as the spermatic groove 

 in the male (PI. 14, fig. 14, g. v.), but it here terminates in a 

 little pit beneath the eye (fig. 14, x.). On the other side of the 

 head, that is on the left, there appeared in all the females that 

 were killed during the breeding season a relatively great pro- 

 tuberance, which had the appearance of a pathological swelling, 

 behind and below the left tentacle (PI. 14, fig. 14,6./>.). On being 

 opened this swelling was seen to be full of small round bodies, 

 which I at first took to be parasites, but which when more 



