CORBIS. CONCHIFERA. 103 



L. undata, Lam. (Venus, Lin.) Shell suborbicular, convex, some- 

 what wrinkled transversely, and slightly undulated longitudi- 

 nally ; margin entire ; colour yellowish white. \\ inch long. In- 

 habits British coasts. B. Pen. Brit. Zool. iv. pi. 58, fig. 3. 

 Fossil species of this genus are found in the London clay, crag, and oolite. 



Gen. 30, CORBIS, Cuv. 



Shell transverse, equivalve, with the beaks bent inward ; two 

 primary teeth, and two lateral ones, of which the posterior is 

 nearest the hinge ; muscular impressions simple. 



C.Jimbriata, Cuv. (Tent**, Lin.) Shell oval, whitish, thick, gib- 

 bous, longitudinally striated, with transverse undulated furrows; 

 margin crenated ; both depressions sublanceolate, and the poste- 

 rior one impressed. 2 inches long by 2^ broad. Inhabits Indian 

 seas.Chem. vii. pi. 43, fig. 448, 449. 



Fossil species of this genus have been found in France. 



Gen. 31. TELLINTDES, Lam. 



Shell transverse, inequilateral, slightly flattened ; beaks small ; 

 hinge with two diverging teeth in each valve, and two late- 

 ral almost obsolete teeth in one valve. 



T. Timor ensis, Lam. Shell oval-elliptical, flattened, white, with 

 transverse concentric striae, and a depression on the anterior side 

 of each valve ; upper margin waved. About 2 inches broad. In- 

 habits Indian seas Lam. v. 536. 



Gen. 32. TELLINA, Lam. Lin. 



Shell transverse or orbicular, generally flattened, with the an- 

 terior side angular, and on the margin a flexuous irregular 

 bend ; one or two primary teeth in the same valve ; lateral 

 teeth two, often distant. 



The flexuous turn on the upper margin near the short side is a distinguishing 

 character in the shells of this genus. In this genus also, as in the Donaces, the liga- 

 ment is exterior and on the short side of the shell. Although the shells are said to 

 be equivalve, the two valves of the same individual are not always exactly alike. 

 Sometimes one is more tumid than the other, and sometimes the striae of one valve, 

 or on one of the sides, are not similar to those of the other. This genus is very nu- 

 merous in species ; all are marine and littoral ; and many prettily coloured. 



* Shell transversely oblong. 



T. radiata, Lin. Shell oblong, minutely striated longitudinally, 

 shining, white, with red rays. About an inch long and 2 broad. 

 European and American seas. Wood's Conch, pi. 38, fig. 2, 3. 



T. virgala, Lin. Shell oval-oblong, angulated before, transversely 

 striated ; colour yellow, with paler transverse belts, and rose-co- 

 loured rays diverging from the apex. About 1| inch long, and 

 2J broad. Inhabits Indian seas. Wood's Conch.pl. 35, fig. 2, 3. 

 This shell is sometimes white, with red rays, and sometimes red, with white rays. 

 T. depressa, Gmel. (T. squalida, Mont.) Shell ovate-oblong, com- 

 pressed, striated transversely^ and rather pointed at the anterior 

 end ; colour pale orange yellow, sometimes nearly white. 1 inch 

 long and If broad. K> Wood's Conch, pi. 45, fig. 3. 



