156 



Transactions of the Royal Society of South Africa. 



distinct from one another, as may be seen from the figure. The right 

 parietal ganglion is, as usual, much larger than the left. 



B 



8 14 ^3 24 54 35 



Text-fig. 17. — Conulinus junodi (Conn.), Lebombo Mountains. 



A. Principal retractor muscles. 



B. Course of a transverse row of teeth in the radula. 



C. Representative teeth from the radula ; X 500. 



D. Roof of mantle-cavity seen from within, showing kidney, etc. (slightly diagram- 



matic) ; x8. 



Digestive system. — The jaw is regularly arched, and measures about 

 1-1 mm. in length. It is smooth except for a few slight traces of vertical 

 folds. 



