Plate I. 

 Tethys dactylomela (Rang). 



Fig. I. Median and first lateral teeth of each side of 49th and 

 50th rows of radula. x 62. 



Fig. 2. 8th, 9th and loth lateral teeth of 49th and 50th rows of 

 radula. x 62. 



Fig. 3. i8th, 19th and 29th lateral teeth of 50th row of radula. 

 X 62. 



Fig. 4. Outermost teeth, the 32nd to 37th laterals of 54th 

 row. X 62. 



Fig. 5. A single typical lateral tooth, x no. 



Fig. 6. Side view of the outer face of 5th laterals of the 49th 

 and 50th rows, x 62. 



Fig. 7. Labial armature in surface view, a, anterior; p, poste- 

 rior margin, x 195. 



