TROCHtTRUS. 299 



part of eacli volution. The large species of Triton are some- 

 times used as trumpets. The Tritons are brought from the 

 Mediterranean, Ceylon, the East and "West Indies, and South 

 Seas. Eeeves' Monograph contains 102 species. Kg. 398 to 

 401. 



TEITONIDEA. Sw. A genus of " Buccininje," Sw. thus de- 

 scribed : " Shell bucciniform, but the basal half is narrowed, 

 and the middle more or less ventricose ; spire and aperture equal. 

 Pillar at the base with two or three obtuse and very transverse 

 plaits, not well defined ; outer lip internally crenated and with 

 a superior siphon ; inner lip wanting, or rudimentary." This 

 genus is the same as the one first distinguished by Mr. Gray 

 under the name of Pollia. The latter name, as stated by Mr. 

 Swainsou, cannot stand, having been previously occupied for a 

 genus of Lepidopterous Insects. Tritonidea articularis. (Pollia, 

 Gray.) PL xix. fig. 415. 



TEIYIA. Gray. A genus composed of those small species of 

 Ctpbjea, Auct. which are characterized by small ridges on the 

 dorsal surface, and have the anterior of the columella internally 

 concave and ribbed, C. Pediculus. Auct. PI. xxi. fig. 449,450. 



TEOCHATELLA. Sw. A sub-genus of Helicinse, consisting of 

 those species which are acute and trochiform. PL xxv, fig. 532, 

 588. 



TEOCHIA. Sw. A genus of the family Buccininse, thus de- 

 scribed : "shape intermediate between Purpurea and Buccinum; 

 whorls separated by a deep groove ; inner lip when young, 

 depressed, when adult, - thickened, convex and striated ; basal 

 canal very small. T. sulcatus. E. M. 422. f. 4." Sw. Malac. 

 p. 300. 



TEOCHISCUS. Sowerby. Tr. Norrissii. 



TEOCHITA. Schumacher. Teochatella, Lesson. Ineundi- 

 BTTLUM, Montf. The spiral species of Calyprsea. 



TEOCHIDON. Sw. A sub-genus of " Trochinse," Sw. Lardn. 

 Cyclop. Malac. p. 351. 



TEOCHIL^A. Sw. ? Pileoltjs, Auct. 



TEOCHUEUS. Humph. Monodonta. Lam. 



