A, Malacozoa Cephalophoia. 



179 



cavimargo, Mrts. . 

 orithyia, Mrts. 

 przewalskyi, Mrts. 

 pulveratricula, Mrts. 

 pulveratrix, Mrts. . 

 stoliczkana, Nevill 



Faiiiilia Helicidae. 



Subfamilia Valloniinae. 



Geuus Vallonia, Risso. 



Subfamilia Helicodontinae. 



Genus Helicodoiita, (Fer), Risso. 



(Gonostoma Held, nee Raf.) 



a) Subgenus Helicodonta s. str. 

 (Trigonostoma, Fitz.j 



b) Subgenus Drepanostoma, Porro. 



nautiliformis, Porro 



triaria, Friv. 



constricta, Boubee 

 quadrasi, Hidalgo 



.1 V. 2 No. 613 



c) Subgenus Aspasita, Westerlund. 



.1 V. 2 No. eil 



d) Subgenus Trissexodon, Pilsbry. 



. I V. 5 No. 1413 



II 



8 



144() 



23* 



