PLATE CXXXV. 



[Part XII.— December 1914.] 



Parvatella sogdiana, von Martens. Samarkand. 



Fig. 1. Animal seen from right side, x 1 5. 



Iff. Ditto, left side, x 1'5. 



16. Shell, xl-5. 



1 c. Part of generative organs, x 45. 



1 d. Male organ, x 4 •.5. 



1 e. Jaw, X 12. 



1/. Teeth of the radula at different parts of the row, x ^68. 



DURGELLA NAHARANIENSIS, G.-A. Assam. 



Fig. 2. Animal, right side of, x 45. 



2 II. Ditto, left side, x 4-5. 



2 b. Shell, front view witli animal in hardened state, x 4-.^. 

 2 c. Some teeth of the radula, much enlarged 



