GASTEROPODA. 85 



Odostomta,* Flem. 1817. 

 Turbo (spec). Mont. 

 Ovatella. Bivona, 1832. 

 Melania. Dubois, 18.31. 



TuRBONILLA. LoVC'H, 184G. 



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 Encyclopedia,' art. 

 Conchology, first published in 1817, appears to have been intended for the recep- 

 tion 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 C/iemnitzia, to which 

 genus they 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 -quadrate 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. 



Turbo plicatus. Mont. Test. Brit. p. 325, pi. 21, 1803. 



— conoideus. Broc. Conch, foss. Subapenn. p. 660, c. 16, fig. 2, 1814. 

 Ovatella polita. Bivona, p. 4, t. 1, fig. 7, 1832. 

 Auricula conoidea. Phil. En. Moll. Sic. vol. i, p. 143, 1836. 

 Tornatella conoidea. Nyst. Coq. foss. de Belg. p. 428, pi. 37, fig. 27, 1844. 

 Odostomia plicata. S. Wood. Catalogue 1842. 



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



UNIDENTATA (7). - - - p. XXXV, fig. 11. 



Turbonilla plicata. Lovin. En. Moll. Scand. p. 19, 1846. 



Od. Testa crassd, elongato-conoided, turritd, lavissimd, politd ; apice obfuso ; anfrac- 

 tibus 7 — 8 planiusculis ; suturis distinct is ; ultimo anfractu subangidato ; columella unipli- 

 catd ; plica media dentiforme ; labro acuto, intus dentato. 



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

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

 subangulated, columella with a sharp and prominent tooth centrally placed ; outer 

 lip sharp and dentated within. 



* Etytn. 'OJoi/j, a tooih, and oro^a, mouth. 



