THE TANGANYIKA PROBLEM. 
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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 
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 Bathanalia howesii. 
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* 
