PLATE CVII. 

 [Part X.—Ajpril 1907.] 



AusTENiA siLCHARENsis, D. sp. Cacliar. 



Fig. 1, 1 a, 1 /'. Shell, x 2-4. 



2. Animal, view of right side, showing the large shell-lobes, x 45. 



2 «. View of the left side, x 2. 



'i. Part of generative organs : amatorial organ, spermatheca, X 12'4. 



;J a. The male organ detached from above, X 12'4. 



AusTENiA ZEMOENSis, n. sp. Sikkim. 



F\g. 4, 4a. Shell, x 2-5. 



5. Animal, view of right side, x 4"5. 



5 a. Ditto, left side, x 4'5. 



G. Edge of mantle, detaehed, showing left shell-lobe and left dorsal lobe, 

 X 4-5. 



7. Extremity of foot, x 4"5. 



8. Anterior portion of the visceral sac, x 4'5. 

 D. The genitalia, x 12. 



