PLATE LXXI. 

 [Part YllL—Januari/ 1898.] 



Pig. 1. Cryptosoma siamense, Haiines, x IS. Siam. 



1 a. Ditto, uat. size. 



2. View of part of left side, showing the left dorsal aud shell-lobes, x 15. 



2 a. Posterior side, foot. 



3. Jaw, X 8. 



4. Central teeth of odontophore, x 368. 

 4 a. 18th, 19th, and 20th median, x 368. 



4 6. 20th, 21st, 22nd, and 23rd uiediaa, x 368. 



4 c. Outermost teeth, x 308. 



5. Generative organs, x 4'5. 



5 a. The male organ, x 8. 



