325 



dorsal edge (which is slightly incurved near the beaks) is mode- 

 rately sloping, when but little sloping obtuse ; posterior extremity 

 very obtusely biangulated, or attenuated and obtuse ; beaks acute 

 prominent and incurved ; fold tolerably distinct ; ligament small 

 narrow and sunken ; teeth obsolete. 



Ceylon and Isle of Negros, Philippines ; (Cuming) . 



This is not the T. angidata of Linnaeus, which I believe to be 

 a Psammohia. 



201. Tellina gtjbernactjlum (pi. lxii. f. 186.) Hcuilo/, Zool. 

 Proc. 1844. 



T. testa subovata, subinpequivalvi, tenui, compressiuscula, laevi, 

 extus intusque albida, valde insequilaterali ; margine ventrali cou- 

 vexiusculo, antice sursum acclinato ; dorsali antice magis minusve 

 convexo et declivi, postice recto brevi et subito declivi ; extremitate 

 lateris antici longioris rotundato-attenuata ; extremitate postica 

 brevissima, truncato-cuneiformi ; flexura, costaque umbonah obso- 

 letis ; ligamento infosso ; dentibus parvis. 



Var. Testa magis elongata ; latere postico brevissimo; margine 

 dorsali postice inaxime declivi, antice subrecto. 



Subovate, rather iuequivalve, thin, somewhat compressed, smooth, 

 whitish, very inequilateral ; ventral edge moderately convex, sloping 

 upwards in front ; dorsal more or less convex and sloping ante- 

 riorly, but short straight and abruptly declining posteriorly ; ante- 

 rior side produced, its extremity attenuated and rounded ; poste- 

 rior side extremely short and truncato-cuneiform ; fold and flexure 

 obsolete ; ligament sunken ; teeth small. 



Var. More elongated ; hinder side extremely short ; dorsal edge 

 nearly straight in front, most abruptly sloping behind. 



Eeal Lejos, Central America (Cuming). 



202. Tellina trtjncata. (pi. lxii. f. 198.) Jonas, Ab. und 

 Bes. Conch, part 3. t. B. f. 2. 



T. testa ovali-subtrigona, solidiuscula, subinajquivalvi, subven- 

 tricosa, subimpolita, extus intusque alba, sublsevigata, valde inse- 

 quilaterali ; margine ventrali subrecto ; dorsali antice convexiusculo 

 et declivi aut subdcclivi, postice recto subelongato et valde declivi ; 

 latere antico producto, ad extremitatem rotundato-attenuato ; la- 

 tere postico subcuneiformi, ad extremitatem angusto et subangu- 

 lato ; flexura subobsoleta, ; ligamento magno, infosso ; dentibus 

 primariis distinctis. 



Oval-subtriangular, tolerably strong, slightly inequivalve, rather 

 ventricose, rather dull white, nearly smooth, very inequilateral ; 



2 B 



