ZONITID^E. 7 



Section ZJNGIS, Martens, 1878. 



Shell heliciform witli simple peristorae ; last whorl with rounded 

 periphery. 



Animal without shell lobes, but with two cervical lobes, with 

 horn over the mucous pore ; jaw smooth. Zanzibar. 



? Section HAMYA, Bourg., 1885. 



Shell Hyalina-like, strangulated near the aperture, as in 

 Alycseus. 



N. REVOILI, Bourg. Quaternary. East Africa. 



Section TROCHOZONITES, Pfeffer, 1883. West Africa. 



Section SITALA, H. Adams, 1856. 



Shell conoid, thin, whorls numerous, usually spirally ribbed 

 or striated ; base convex, narrowly or indistinctly umbilicated. 



Animal long and narrow ; tail gland surmounted by a distinct 

 horn ; two shell lobes and two cervical lobes on the mantle, all 

 of them small and with no separately produced appendages ; jaw 

 thin, smooth, concentrically striated in the middle. 



India, Bunnah, East Indies. 



Conulema. Stoliczka, 1871, is a synonym. 



Section KALIELLA, Blanford, 1863. 



Shell conical, with angulated periphery. 



Animal with well-defined caudal appendage. India. 



Subgenus ORPIELLA, Gray, 1855. 



Shell thin, rounded, depressed, whorls convex, the last some- 

 what flattened basally. 



Animal without shell lobes ; a protuberance over the mucous 

 pore, and several fleshy appendages in a double row along the 

 back of the tail. 



Fiji Islands. 

 Subgenus XESTA, Albers, 1850. 



Shell perforate, or narrowly umbilicate, orbicularly depressed, 

 smooth, usually polished ; aperture large, rounded ovate, margin 

 acute, columellar margin dilated and reflexed. 



Animal with one or two shell lobes ; mucous pore simple, or 

 surmounted by a slightly developed corniform appendage. 



Section XESTA (restricted). East Indies, India, etc. 



Section XESTINA, Pfeffer. India. 



