PLATE I. 

 Tethys dactylomela (Rang). 



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

 5oth rows of radula. x 62. 



Fig. 2. 8th, 9th and loth lateral teeth of 49th and 5oth rows of 

 radula. x 62. 



Fig. 3. 1 8th, i9th and 29th lateral teeth of soth 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 5oth rows, x 62. 



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

 rior margin, x 195. 



