TELLINIDiE. HI 



Tellidora, Morch, 1851. 



Distr. — 2 sp. W. Coast of Central America. Fossil, 1 sp. 

 Pleistocene ; So. Carolina. T. Burnettii, Brod. (cxii, 75). 



Shell subtriangular, rounded below, very inequivalve, right 

 valve concave, left valve slightl}'- convex ; concentrically plicate, 

 the plicjB forming teeth on the lateral margins ; beaks angular, 

 inclined anteriorly ; two cardinal teeth in one valve, one in the 

 other ; two lateral teeth in each valve. 



GrASTRANA, Schumachcr, 1817. 



Syn. — Fragilia, Desh., 1848. Diodonta, Desh. 



Distr. — 5 sp. Norway, Britain, Mediterranean, Black Sea, 

 Senegal, Cape. G. fragilts, Linn, (cxii, 16, 11). Fossil. Mio- 

 cene — ; Britain, France, Belgium. 



Shell equivalve, convex, with squamose lines of growth ; car- 

 dinal teeth two in right valve, one bifid tooth in left ; pallial 

 sinus deep and rounded ; umbonal area punctate ; ligament 

 external. 



Animal with the mantle open in front, its margins fringed ; 

 siphons elongated, slender, separate, unequal, orifices with cirri ; 

 foot small, compressed, linguiforra ; palpi large, triangular ; gills 

 unequal, soft, finely striated. 



Gastrana inhabits shallow water, boring in mud and clay, and 

 not traveling about like the Tellens. 



Macalia, a. Adams, 1860. 



Distr. — 31. iyiquinata, Desh. (cxii, 18). 



Shell suborbicular, rather solid and inflated, posteriorly with 

 a moderate ridge, nearly equivalve ; the beaks are prominent, 

 the ligament situated in a deep groove ; the hinge with two very 

 strong cardinal teeth in each valve. 



QuENSTEDTiA, Morris and Lycett, 1853. 



Dedicated to Prof. Quenstedt, palaeontologist, of Wiirtemburg. 



Syn. — Arcomya and Mactromya (in part), Agassiz. 



Distr. — 3 sp. Oolitic; England, France, Grermany. Q. oblita, 

 Phil, (cxii, 98). 



Shell oblong, equivalve, moderately solid, umbones nearly con- 

 tiguous, hinge with a transverse cardinal tooth in the left, and 

 a corresponding pit in the right valve ; ligament external, placed 

 in a long, narrow groove, pallial sinus small. 



Only a few Jurassic species have as yet been referred to this 

 genus ; its systemic position is doubtful. 



LuciNOPSis, Forbes and Hanlej^, 1848. 

 Syn. — Lajonkairia, Desh. Mysia, Gray. 



Distr. — G sp. Europe, W. Indies, W. Coast of South America. 

 L. undata, Pennant (cxii, 19). 



