312 



T. testa ovata aut obovata, magis minusve ventricosa, solidins- 

 cula, subnitida, sublaevigata, subseqiiilaterali, extus intusque albida, 

 liueis obsoletis pallidioribus subradiata, epidermide pertenui lutes- 

 cente induta; margine ventrali antice arcuato^ postice sursuin 

 acclinato; dorsali antice prope nates acutas subrecto deindeque 

 arcuato et subdeclivi, postice subretuso et valde declivi; latere 

 antico longiore, rotmidato ; postico attenuate, angulato, et paululmn 

 subrostrato ; flexura costaque umbonali satis conspicuis -, llgamento 

 prominulo; dentibus minimis. 



Ovate or obovate, more or less ventricose, not very strong, 

 rather glossy, nearly equilateral, wliitish both within and without, 

 covered by a very tliin yellowish ash-coloured epidermis, nearly 

 smooth being merely wrinkled by the hues of growth, peculiarly 

 marked with obsolete radiating lines; ventral edge arcuated in 

 front and rising behind ; anterior side rather the longer, its extre- 

 mity rounded, its dorsal edge at first nearly straight and tlien 

 arched and moderately sloping; posterior side attenuated, angu- 

 lated, and very slightly beaked ; fold and flexure tolerably distinct ; 

 Ligament short and slightly prominent ; teeth very small. 



Gambia. 



In typical examples there is a slight groove-hke depression 

 behind the fold, which does not exist in the next species. 



178 Tellina Cayennensis (pi. Ixii. f. 190.) Psammobia C. 

 Zam. no. 11 ; Hani. Des. Cat. p. 58. sup. 1. 11. f. 48 ; Deles. Rec. 

 t. 5. f . 7 ; T. constricta, P/iil., Ab. und Bes. Conch, part 3. t. 5. 

 f , 5 ; T. intastriata, Sa^, Jour. Ac. Nat. Sc. Philad, 



T. testa ovali-trigona, solida aut solidiuscula, magis minusve 

 ventricosa, subiuEequivalvi, subinrcquilaterali, nitidiuscula, extus 

 intusque albida, epidermide cinerascente induta, subla^vigata ; mar- 

 gine ventrali convexiusculo ; dorsali antice convexo et subdeclivi, 

 postice subrecto et declivi ; latere antico paulo longiore, rotundato ; 

 postico cuneiformij natibus recte incurvatis; ligamento promi- 

 nulo, satis magno; flexiu'a costaque umbonali satis conspicuis; 

 dentibus hand parvis. 



Triangularly-oval, more or less solid and ventricose, shghtly 

 inequivalve and inequilateral, scarcely glossy, nearly smooth, whitish 

 within and without, covered by a very tliin ashy epidermis ; ven- 

 tral edge slightly convex ; dorsal convex and moderately sloping 

 in front, straightish (never incurved) and strongly sloping behind ; 

 front side rounded, rather the longer ; hinder side wedge-shaped ; 

 beaks incurved ; Hgament httle prominent, and as well as the teeth, 

 of a moderate size ; fold and flexure tolerably distinct. 



