414 MOLLUSCA. 



a plate, and under the teeth a large cavity, which receives a part of 

 the ligament(l). 



GalathjEA, Brug. 



The shell triangular; three teeth on the summit of one valve, and 

 two on the other, en chevron; the lateral plates approximated(2). 



But a single species is known; it inhabits the fresh waters of 

 the East Indies. 



It is here also that must be placed another genus separated 

 from Venus, the 



CoRBis, Ciiv. FiMBRTA, Megerl. 



Marine testaceous Acephala, transversely oblong, which have also 

 stout middle teeth, and well marked lateral plates; their external 

 surface is furnished with transverse ribs so regularly crossed by 

 rays, that it may be compared to wicker-work. 



The impression of their mantle exhibiting no flexure, their tubes 

 must be short(3). 



Some of them are fossil(4). In the 



Tellina, Lin. 



There are in the middle, one tooth on the left and two teeth on the 

 right, frequently forked, and at some distance before and behind, 

 on the right valve, a plate, which does not penetrate into a cavity 

 of the opposite one. There is a slight plica near the posterior ex- 

 tremity of the two valves, which renders them unequal in that part, 

 where they are somewhat open. 



The animal of the Tellinse Pkron^a, Poll, like that of the Dona- 

 ces, has two long tubes for respiration and for the anus, which with- 

 draw into the shell, and are concealed in a duplicature of the mantle. 



Their shells are generally transversely striated, and decorated 

 with beautiful colours. 



Some of them are oval and thick. 



Others are oblong and strongly compressed. 



(1) Venus islandica, Chemn., VI, xxxli, 342, Encyc. pi. 301, f. 1; a large fossil 

 species is found in the hills of Siennois and near Uax, of Bourdeaux. 



(2) The Egeria, Roiss., or Galathxa, Drug-., Encyc, 249, and Lam., Ann. du 

 Mus.,V, xxviii, and FerausAermap^rorftte, Chemn., VI, xxxi, 327 329? or Verms 

 subviridis, Gm. 



(3) Venus Jimbriaia, Chemn., VII, 43, 448. 



(4) See Ueshayes, Coq. Foss. des Envir. de Paris, I, xiv; Brongn., Mem. sur Ic 

 Vicentur. 



