236 TURBONILLIDAS. 
numerous, apex sinistral: aperture subquadrangular, lip not con- 
tinuous, columella straight, not plicate. 
styLopryGMA, A. Ad., 1860. Shell inflated about the middle 
of the spire, thus becoming somewhat pupiform; smooth, or 
slightly ribbed. 7. stylina, A. Ad. Japan. 
AntsocycLa, Monts. 
Syn.—Aciculina, Deshayes (not Ads.). 
Distr.—6 sp. Eocene; Paris basin. A. gracilis, Desh. (1xviil, 
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. 
Acuis, Lovén. 
Ktym.—A, without, kleis, a projection. 
Syn.—Alvania, Leach (not Risso). Ceelatura, Conrad. Cion- 
iscus, Jeffreys. Pherusa, Jeffreys. Actzeonema, Conrad. 
Distr.—A. nitidissima, Mont. (lxviil, 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 elabrous, turreted, rimate, lip arcuate. 
Synonymous with Ebala (7). A. ventr osa, Jettreys (xa ily 199): 
RISsoPsIs, Garrett. Shell small, thin, elongate, cylindrical ; 
apex truncate; aperture subovate, angular above, entire ; peris- 
tome rather thin, somewhat expanded; columella oblique, 
arched. &. typica, Garrett (xviii, 3°. Viti and Samoa Isles. 
1oL@A, A. Ad. Resembles Niso, but has a remarkably thin, 
spirally suleated shell. Deep water. I. scitula, A. Ad. (Ixviii, 4). 
Japan. 

Ovostomta, Fleming. 
Etym.—Odous, a tooth, and stoma, mouth. 
Syn.—Odontostoma, Phil. Odontostomia, Jeffreys. 
Distr.—Species numerous, distribution universal, from low- 
water to 40 fathoms. Fossil, 15 sp. Hocene—. 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. : 
