158 VITRTNA. 



Y. COMORENSIS, Pfr. PI. 35, fig. 2. 



Globose, thin, rugosely striate, diaphanous, barely shining, 

 greenish corneous with dots and strigations of yellowish ; 

 whorls 3, the last inflated; aperture somewhat pearly, varie- 

 gated with white. Diam. and alt. about 20 mill. 



Ins. Mayotte, Comoro Is. 



Yery much resembling Helix aperta, Born. 



Y. CONQUISITA, Jickeli (unfigured). N. E. Africa. 



Y. RIEPIANA, Jickeli (unfigured). Abyssinia. 



Y. ABYSSINICA, Riippell (unfigured). Abyssinia. 



Y. PEROBLIQUA, Innes (unfigured). Abyssinia. 



Y. Polynesian Species. 



Y. SUBVIRIDIS, Pease. PI. 35, figs. 3-5. 



Imperforate, very thin, fragile, pellucid, smooth, vitreous, 

 suborbicular, greenish yellow; whorls 4, suture distinct; aper- 

 ture rounded-oval. Diam. 10, alt. t mill. 



Marquesas Is. 

 Y. FUSCA, Pease. PL 35, figs. 6-8. 



Thin, pellucid, shining, smooth, fuscous-olivaceous, suborbi- 

 cular; whorls 4, with impressed suture ; aperture rounded-oval. 



Diam. 10, alt. 7 mill. 



Marquesas Is. 



Besides the difference in color, the spire is more prominent 

 than in the preceding species. 



Y. ULTIMA, Mousson. PL 35, figs. 9, 10. 



Imperforate, depressed above, convex below, thin, very 

 sjiining, pellucid, amber- colored, very slightly striate ; whorls 

 3J, rapidly enlarging, the last large ; aperture obliquely oval, 

 columellar margin membraneous. Diam. 9, alt. 4-6 mill. 



Sunday Island, Kermandec Archipelago. 



V. Kermandecensis, Smith (unfigured), is a synonym. 



Y. FASCIATA, Souleyet; PL 35, figs. 26, 27. 



Shell somewhat auriform, very thin, pellucid, yellowish ; 



