325 



dorsal edge (which is shghtly 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 suidven ; teeth obsolete. 



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



Tliis is not the T. angidata of Linnaeus, wliich I believe to be 

 a Psammobia. 



201. Tellina gubeknagulum (pi. bdi. f. 186.) Eanlei/, Zool. 

 Proc. 1844. 



T. testa subovat^, subinsequivalvi, tenui, compressiuscida, laevi, 

 extus intusque albida, valde insequilateraK ; margine ventrali con- 

 vexiusculo, antice sursum accHnato ; dorsali antice magis minusve 

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

 lateris antici longioris rotundato-attenuata ; extremitate postica 

 brevissima, truncato-cuneiformi ; flexura costaque umbonali obso- 

 letis ; hgamento infosso ; dentibus parvis. 



Var. Testa magis elongata ; latere postico brevissimo ; margine 

 dorsali postice maxime declivi, antice subrecto. 



Subovate, rather inequivalve, 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-cmieiform ; fold and flexure 

 obsolete; ligament sunken; teeth small. 



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

 nearly straight in front, most abruptly sloping behind. 



Eeal Lejos, Central America (Cuming). 



202. Tellina truncata. (pi. Ixii. f. 198.) Jonas, Ab. und 

 Bes. Conch, part 3. t. 5. f. 2. 



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

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

 quilaterali ; margine ventraK subrecto ; dorsali antice convexiusculo 

 et declivi aut subdeclivi, postice recto subelongato et valde dechvi ; 

 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 inecpivalve, rather 

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



2 B 



