236 TUIIBONILLID^. 



numerous, apex sinistral ; aperture subquadrangular, lip not con- 

 tinuous, columella straight, not plicate. 



STYLOPTYGMA, A. Ad., 1860. Shell inflated about the middle 

 of the spire, thus becoming somewhat pupiform ; smooth, or 

 slightly ribbed. E. stylina, A. Ad. Japan. 



Anisocycla, Monts. 



Syn. — Aciculina, Deshayes (not Ads.). 



Distr. — 6 sp. Eocene; Paris basin. A. gracilis, Desh. (Ixviii, 

 100). Closely allied to Eulimella. 



Shell small, aciculated ; apex laterally inclined ; whorls 

 numerous, convex, smooth ; aperture entire, small, subquadran- 

 gular ; columella straight, narrow, cylindrical, and simple. 



AcLis, Loven. 



Etym. — A, without, kleis, a projection. 



Syn. — Alvania, Leach (not Risso). Cselatura, Conrad. Cion- 

 iscus, Jefireys. Pherusa, Jeffreys. Actseonema, Conrad. 



Distr. — A. nitidissima, Mont. (Ixviii, 92). Fossil, 12 sp. 

 Devonian — ; Europe, United States. 



Shell minute, like Turritella ; usually spirally striated; apex 

 sinistral ; aperture oval ; outer lip prominent ; axis slightly 

 rimate. Operculate. 



Animal with a long retractile proboscis ; tentacles close 

 together, slender, inflated at the tips ; eyes immersed at the 

 bases of the tentacles ; operculum lobe ample, unsymmetrical ; 

 foot truncated in front. 



EBALA, Leach. Shell smooth, rimate. A. diaphana, A. Ad. 



HEMiACLis, Sars. Shell glabrous, turreted, rimate, lip arcuate. 

 Synonj^mous with Ebala (?). A. ventrosa, Jeffreys (Ixviii, 99). 



Rissopsis, Garrett. Shell small, thin, elongate, cylindrical ; 

 apex truncate ; aperture subovate, angular above, entire ; peris- 

 tome rather thin, somewhat expanded; columella oblique, 

 arched. B. typica, Garrett (Ixviii, 3 \ Viti and Samoa Isles. 



lOL^A, A. Ad. Resembles Niso, but has a remarkably thin, 

 spirally sulcated shell. Deep water. I. scitala, A. Ad. (Ixviii, 4). 

 Japan. 



Odostomia, Fleming. 



Etym. — Odous^ a tooth, and stoma, mouth. 



Syn. — Odontostoma, PhlL Odontostomia, Jeffreys. 



Distr, — Species numerous, distribution universal, from low- 

 water to 40 fathoms. Fossil, 15 sp. Eocene — . O.nitida, Alder 

 (Ixviii, 5.) 



Shell subulate or ovate, typically smooth ; apex sinistral ; 

 aperture ovate ; peristome not continuous ; columella with a 

 single tooth-like fold. Operculum horny, indented on the inner 

 side. 



