GODWIN-ATJSTEIf : ON TEOCHONANINA, ETC. 287 



at all like that of the species I have described further back, especially 

 in the central teeth. 



Selix (?) conicoides is more difBcult to place in its correct subgeneric 

 position, and until I can obtain some of these species with conical 

 shells and solid spires preserved in spirit, I shall not attempt to do 

 so. The animal belongs certainly to the Zonitidce, and consequently 

 is widely separate from those other species, described above, in which 

 the mucous gland can hardly be discerned. 



EXPLANATION OF PLATE XIX. 



Fig. 1. Martensia Mozambicensis. Animal left side, x 4. 



,, \a. Extremity of foot, x 6 25. 



,, \b. ■ Generative organs, x 2. 



,, Ic. Spermatheca with spermatophore. x 12. 



,, \d. Male organ of another specimen, x 4. 



,, \e. Teeth of radula. x 196. 



,, 2. Discus trilineatus. Generative organs, x 8. 



,, 2a. ■ Part of male organ, x 6. 



^^ 2b. ■ Teeth of radula. x 368. 



,, 3. Discus bicolor. Generative organs, x 4. 



,, 4. Helix (?) conicoides. Generative organs, x 4. 



,, 4«. Portion of male organ showing spermatophore, 



in position of development, x 6. 



,, 45. Spermatophore, enlarged, x 6. 



,, 4c. Jaw. X 4. 



,, 4^d. Teeth of radula. x 368. 



,, 5. Sivella castra. Generative organs, after Stoliczka. 



,, ha. Jaw. 



,, bb. Teeth of radula. 



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