256 



THE TANGANYIKA PROBLEM. 



similar to that of Typhobia, both male and female apparatus 

 occupying the same position as the body wall. In the male 

 the genital gland occupies the upper surface of the apical 

 whorl in the body, and is connected by several channels 

 with a nearly straight vas deferens. This latter structure 

 opens without any modifications along its course by a slit- 

 like aperture. In the female the ovary occupies the same 

 position as the male gland, and in like manner it is con- 



Fig- 39- — Shell of Spekia zonata. 



nected with the nearly straight oviduct, the lower portion 

 of which, or that which lies within the mantle cavity, 

 forming a brood chamber where the eggs go through 

 their later stages of development, the animal being vivi- 

 parous. 



SPEKIA, CROSS. S. ZONATA. (FIG. 39). 



The shell of this remarkable mollusc is represented 

 in Fig. 39, and it is certainly most curious that no 

 attention has been drawn by any of the conchologists to 



