294i TEACHELIPODA. 



aperture ; shell (typically) turrited, and equally fusiform ; re- 

 presenting the Muricidce and Cymbiola." Sw. Malac. p. 319. 

 The principal difference between Tiara and Mitra appears to be 

 that in the latter, the aperture is more linear and contracted in 

 the centre. Mitra Episcopalis is an example. 



TINOPOEUS. Montf. A genus of microscopic Eoraminifera. 



TIEANITES. Montf. A division of the genus Baculites. 



TOMELLA. Sw. A genus of " Pleurotominee," Sw. thus de- 

 scribed : " Eusiform, smooth ; the spire of very few whorls, and 

 not longer than the channel ; inner lip with a thick callosity at 

 the top ; the slit short and wide ; liaeata, En. Meth. 440, f. 2, 

 claAdcularis, lb. f. 4. filosa. En. Meth. 440, f. 6. lineolata. lb. f. 

 11." Sw. p. 314. PL xxvi. fig. 551. 



TOMOGBEUS. Montf. 1810. Anastoma, Eischer. Described 

 under the later name, Anastoma, see fig. 271. 



TONICIA. Gray. Syn. B. M. p. 126. A genus composed of 

 those species of Chiton which have the margin smooth. Ch. 

 elegans, &c. 



TOENATELLA. Lamarck. Acteon, Montf. Fam. Plicacea, 

 Jj^m. — Bescr. Oval, spirally grooved; spire short, rather obtuse, 

 consisting of few whorls ; aperture long, narrow, rounded ante- 

 riorly ; outer lip simple ; inner lip thiu, slightly spread, columella 

 spiral, incrassated, confiuent with the outer lip. The recent 

 species are few. Several fossil species occur in London Clay, 

 Inferior Oolite and Calcaire-grossier. Monoptygma, Lea, re- 

 sembles this genus, but has a fold in the inner lip. T. solidula, 

 PL XV. fig. 343. 



TOENATINA. Adams, 1850. A subgenus of Bullidse, thus 

 described : " Shell cylindrical or fusiform, spire conspicuous, 

 apex papillated, suture chanelled, columella callous, with a single 

 plate." Sixteen species are described in Mr. Adams' Mono- 

 graph, Pt. X. Sowerby's Thesaurus. 

 TOETUOUS. (Tortuosus) Twisted. This adjective is sometimes 



applied as a specific name ; as Area tortuosa. 

 TEA.CHELIPODA. Lam. (7-pax»?Xoe, trachelos, a neck; wola, 

 poda, foot.) The third order of the class MoUusca, in the system, 



