176 



ZONITIDJE. 



whorls of the visceral sac and gives to the shell a similar tone of 

 coloration. There are no shell-lobes, and by this character alone, 

 without looking at any other, the genus and species may be 

 recognized. The dorsal lobes are very much reduced in size, 

 having regard to the size of the animal. The foot is not divided 

 on the sole. 



The lobe over the mucous gland is very small ; the peripodial 

 fringe is very small, below the usual parallel grooves. 



The generative organs. The penis has a coiled caecum, to the 

 side of which the retractor muscle is attached ; the kale-sac is 



[Fig. 62. Bensonia camura. 



A. Part of the animal, showing right dorsal lobe- 



B. Genitalia. X 2'4. 



C. Jaw. x 9. 



D. Teeth of the radula. x 276. 



X2. 



E. Shell. Nat. size. 



Bensonia wynnii. 



Bensonia jacqucmonti, var. kurramensis. 



F. Dorsal lobes. X 3. 



G. Extremity of foot, side view, contracted in spirit. X 3. 



viewed from above from life. Enlarged. 



H. Outermost lateral teeth of radula. X 276. 

 I. Genitalia. X 6.] 



