298 TRITON. 



boes.) Pro. Zool. Soe. and Thesaurus Concbyliorum, p. 500. 

 No. 10. A remarkable form of bivalve shell, differing from the 

 Pholades in several particulars — 1st. It has no curved processes 

 in the hinge ; 2nd. The right valve is produced at the hinder 

 eud into a tongue or lappel ; 3rd. The left valve extends its ven- 

 tral covering, so as completely to overlap the other anteriorly, 

 PI. xxvii. fig. 566. 



TE.IPHOEIS. Deshayes. A genus composed of small reversed 

 species of Cebithium, Auct. which have the anterior canal 

 closed at the anterior of the aperture, but opened at the ex- 

 tremity, and a small tubular opening on the upper part of the 

 whorls, making three openings on the body whorl. This genus 

 stands in the same relation to Cerithium as the Typhis to Murex. 

 PL xvi. fig. 375, 376. 



TEIPLEX. Humph, Mueex, Linn. 



TE,IPL0D0:N'. Splx. Hyria, Auct. 



TRIPTEE.A. Quoy et Graimard, Ctjvieea, Per. Described in 

 the Voyage de la Coquille, and represented as a molluscous 

 animal destitute of a shell. 



TEIQUETEA. Bl. Triangular species of Yentjs, Auct. 



TEISIS. Oken. Aeca tortuosa, Auct. 



TEISTOMA. Described as Teiphora. 



TEITON. Montfort, 1810. Fam. Siphonostomata, Bl. Canalifera, 

 Lam. — Descr. Oblong or oval, thick, ribbed or tuberculated, with 

 discontinuous varices placed at irregular distances ; spire pro- 

 minent, mammillated ; aperture round or oval, terminating an- 

 teriorly in a generally long, slightly raised canal ; columellar lip 

 granulated or denticulated ; outer lip thickened, reflected, 

 generally denticulated within ; epidermis rough ; operculum 

 horny. — Obs. However nearly aUied the Tritons may appear to 

 the Murices and Eanellse there are still to be traced in the shells 

 of each of those genera, several constant and well marked dis- 

 tinctions, by which they may be at once recognized. In the 

 EanellEe, the varices run in two rows along the spire ; in the 

 Murices, they form three or more rows ; but in the Tritons, they 

 do not follow each other, i. e. they do not occur in the same 



