270 TEREBELLUM. 



Descr. Sub-equivalve, inequilateral, compressed, rounded ante- 

 riorly, slightly beaked or angulated posteriorly, the posterior 

 ventral margin having a flexuosity ; hinge with two cardinal and 

 generally two lateral teeth in each valve ; muscular impres- 

 sions, two in each valve, remote ; palleal impression with a large 

 sinus. — Obs. The fold or bending in the posterior margin dis- 

 tinguishes this genus from others which it nearly resembles. It 

 is composed of some bivalves of great beauty and variety, which 

 are found in nearly all climates. Fig. 105, T. radiata, 106, T. 

 lingua-felis. 



TELLINIDES. Lam. Fam. Nymphacea, Lam. — Descr. Sub-equi- 

 valve, inequilateral, transverse, compressed, rounded anteriorly, 

 slightly beaked or angulated posteriorly ; hinge with two cardinal 

 teeth in each valve, and one lateral tooth in one valve, very near 

 the cardinal teeth. Muscular impressions two, distant, palleal 

 impression with a large sinus. Obs. This genus is distinguished 

 from Tellina in having but one lateral tooth nearthe cardinal teeth. 

 Fig. 107, T. rosea. Tropical. 



TENUIPEDES. {Tenuis, slender; pedes, feet.) The second sec- 

 tion of the order Conchifera Dimyaria, divided into the families 

 Mactracea, Corbulacea, Lithophagidse, Nymphacea. 



TERACLITA. Sebum, Conia, Auct. 



TEREBELLUM. Lam. ( Terebra, an augur ?) Fam. Convolutse, 

 Lam. Angyostomata, Bl. — Descr. Smooth, slender, oblong, sub- 

 cylindrical ; spire obtuse, short, sometimes hidden; (Seraphs, 

 Montf.) aperture long, narrow posteriorly, wider anteriorly ; outer 

 lip slightly thickened, truncated, unconnected at the base with 

 the columella ; inner lip thin, smooth, nearly straight, spread 

 over a portion of the body-whorl, continued in a ridge above the 

 sutures of the spire. — Obs. Montfort has separated the fossil 

 species with hidden spires, under the name Seraphs. (T. convo- 

 lutum, Lam.) Only one recent species is known, of which there 

 are several varieties, one spotted, one marked in sub-spiral lines, 

 another in patches. It is brought from the East Indies. Fig. 451, 

 T. convolutum ; 452, T. subulatum. 



