PLATE CXI I. 



[Part X.— April 1907.] 



Philalaxka thwaitesi, Pfeitfer. Ceylon. 



Fig. 1. Generative organs, x 12"5. 



] a. Jaw, X 163. 



1 b. Jaw, the edge of. x 196. 



1 c. Teeth oi' rarlula at different parts of a row, x 1 lUO. 



TiiYSANOTA eaixiGERA, Bcusou. Southern India. 



Fig. 2. Animal removed from the shell, showing foot, visceral sac, and mantle-edge. 



2 a. Teeth of the radula at different parts, x 920. 

 2 b. Jaw, central part of, x 196. 



2 c. Jaw, X 21. 



2d. Buccal mass and salivary gland &c., x 12. 



Sykesia BiciLiATA, Pfcill'er. Ceylon. 



Fig. 3. Generative organs, x 12. 



3 a. Buccal mass, x 12. 



3 b. Teeth of radula at different parts of the row, x 920. 

 3 c. Spatulate epidermal hairs of shell, x 24. 



