PLATE CIV. 

 [I'art X.—Ajml 1907.] 



Mackochlamys tugurium, Benson. Sikkim. 



Fi^. 1, la. Shell, natural size. 



1 Zi. Ditto, enlarged, X 2'5. 



2. Animal, with shell removed, to show right shell-lobe and visceral sac, x I'o. 



3. ]*]xtreinity of foot, x 8. 



4. Part of animal, showing mantle-edge, visceral sac, and I'haractor of its 



markings, x -I'S. 



5. (lenitalia, X -lo. 



5 a. Ditto of another specimen, penis and spermathcea, x i"5. 



") //. Ditto, male organ, reverse side, x 4'5. 



0. Jaw, X 12-5. 



7. Teeth of radula at various parts of a row, x 3G8. 



