GASTEROPODA. 85 



Odostomta,* Flem. 1817. 

 Turbo (spec). Mont. 

 OvATELLA. Bivona, 1832. 

 Melaxia. Dubois, 1831. 

 TuRBoNiLLA. Lovin, 184fi. 



Gen. Char. Shell small, conical, or subulate ; generally smooth and glossy, with 

 an obtuse and often a reversed apex ; sometimes striated, and occasionally costated 

 longitudinally ; aperture ovate, acuminated at the upper part, with a tooth-like 

 projection or fold upon the columella. 



This name, as proposed by Dr. Fleming, in the ' Edinburgh Encyclopaedia,' art. 

 Conchology, first pubhshed in 1817, appears to have been intended for the reception of 

 a number of land shells, with a denticulated aperture, such as Pupa, Clausilia, &c., 

 but was subsequently restricted, or rather transferred by that author in his ' Hist, of 

 Brit. An., 1828,' to a series of small marine shells with an ovate aperture, and a single 

 plait upon the columella. 



Mr. Alder has informed me that the animals of this genus have ear-shaped tentacles, 

 with eyes at the internal base, resembling those of Chemintzia, to which genus the)'^ 

 have been united by M. Loven. The shells, however, appear to differ from those of the 

 latter genus in being less turriculate, with fewer volutions, and having a less qviadrate 

 form of aperture, sufficiently so, I imagine, to be considered as generically distinct. 

 Should it be necessary to unite the two, the name of Chemnitzia must yield to the prior 

 one of Dr. Fleming. 



'»• 



1. Odostomia plicata. Mont. Tab. IX, fig. 3, a — b. 



TuKBO PLICATUS. Mont. Test. Brit. p. 325, pi. 21, 1803. 



— CONOIDEUS. Broc. Conch, foss. Subapenn. p. 6G0, c. 16, fig. 2, 1814. 

 OvATELLA POLITA. Bivona. p. 4, t. 1, fig. 7, 1832. 

 AciiicuLA coNoiDEA. Phil. En. Moll. Sic. vol. i, p. 143, 1836. 

 ToRKATELLA CONOIDEA. Ni/st. Coq. foss. de Belg. p. 428, pi. 3", fig. 27, 1844. 

 Odostomia plicata. S. Wood. Catalogue 1842. 



— — Thorpe. Mar. Conch, p. 172, fig. 13, 1844. 



UNIDENTATA (?). - - - p. XXXV, fig. 11. 



Turbonilla plicata. Lorin. En. Moll. Scand. p. 19, 184C. 



Od. Testa crassd, elo7iffafo-conoided, turritd,l(Bvissimd,politd ; apiceobfuso; anfractibtis 

 7 — 8 planiusculis ; stduris distinctis ; ultimo anfractti subangulato ; columelld uniplicatd ; 

 plica media dentiform ; labro actifo, intvs dentato. 



Shell thick and strong, elongato-conical, turriculate, smooth and glossy, with an 

 obtuse reversed (?) apex ; whorls 7 — 8, flattish ; suture distinct ; last whorl subangulated, 

 columella with a sharp and prominent tooth centrally placed ; outer lip sharp and 

 dentated within. 



* Etym. 'OSous, a tooth, and (rrd/m, a mouth. 



