THE TANGANYIKA PROBLEM. 



227 



characteristics. There is a secondary connection between 

 nerves springing from the supra-intestinal ganglion and the 

 left pleural, so that the animal is what has been termed 

 dyaloneurous on the left, and I have lately found that in 

 some specimens a similar dyaloneurous connection can be 



* \*s 



Fig. 8. — Back and front view of Bathanalia howesii. 



traced on the right. The animal is viviparous, and the 

 genital gland occupies the upper surface of the terminal 

 body coils, resting upon the liver. The sexes are distinct, 

 and in the male there are two forms of spermatozoa, as in 

 Murex and Vivipara. The genital duct is, in both cases, 



Fig. 9. — Operculum of Halhanalia hozucsii. 



not much coiled ; in the male, it runs along the angle 

 between the right side of the mantle and the body. Near 

 its extremity (Fig. 3) it is connected with, and sur- 

 mounted by, a hollow muscular organ and then opens 

 by a large slit-like aperture just beneath the anus. In the 



15* 



