256 
THE TANGANYIKA T ROB LEM. 
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 zonal a. 
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 
