256 



forwards ; ligament smiken ; edges of the almost terminal mnbonal 

 ridge acute, the intervening space flattened or concave ; fold not 

 conspicuous; inside pui-e glossy wliite; lateral teeth large, the 

 anterior approximate. 



St. Nicholas, Zebu. 



The Ivjiata of Chemnitz (6. f. 86.) is very like this species, but 

 I do not venture to assert its identity, as the figm-e certainly differs 

 in some respects, and neither Lamarck nor Philippi, although both 

 conversant with the figure, have quoted it. 



62. Tellina deltoidalis (pi. lix. f. 128 and pl.lxiv. f.229.) 

 Lam. no. 49; Hani. Des. Cat. p. 70. sup. t. 13. f. 3; T. lactea, 

 Q,my et Gai. Yoy. Astrol. Zool. vol. 3. p. 501. t.81. f. 14, 15, 16 ; 

 Deles, t. 6. f. 7. 



T. testa subtrigona, ovata, obovata, aut suborbiculari, soUda, sub- 

 insequivalvi, convexa, subEequilateraH, impohta aut vix nitidiuscula, 

 intus extusque albida, sublajvigata ; margine ventrali in medio 

 subrecto, utrinque sursmn acclivi ; dorsali antice vix dcchvi, pos- 

 tice valde dccHnente incujvato ; latere postico subcuneiformi, ad 

 extremitatem subangulato; extremitate antica obtusa; natibus 

 prominentibus, recte incurvatis; flexui-a costaque umbonali dis- 

 tinctis; ligamento magno, infosso; dentibus laterahbus parvis, 

 antico approximato, postico remoto plerumque subobsoleto. 



Yar. Latere antico baud dilatato ; margine dorsali antice magis 

 declivi, postice recto haudque incui'vato. 



Shell varying in shape from ovate-triangular to suborbicular- 

 triangular, solid, shghtly inequivalve, convex, subequilateral, scarcely 

 if at all glossy and usually quite dull chalky white, nearly smooth 

 or only marked with rather strong lines of growth ; ventral mar- 

 gin sloping upward at both ends, nearly straight in the middle ; 

 fold and mnbonal ridge distinct ; beaks prominent and incurved ; 

 bgament large but sunken ; anterior side dilated, obtuse, dorsal 

 slope sbght; posterior side somewhat wedge-shaped (at times 

 almost subrostrated), its dorsal edge incurved and very strongly 

 sloping, its extremity subangulated and much attenuated ; lateral 

 teeth small, the anterior approximate, the posterior distant and 

 often almost obsolete. 



Yar. Ligamental edge not incm'ved but straight ; anterior side 

 not dilated, slope stronger, and extremity rounded. 



Australia. 



63. Tellina eausta (pi. Ixiv. f. 230, 234) Donovan, vol. 3. 

 t. 98 ; Dor. Cat. t. 5. f. 5 ; Dillwyn D. Cat. p. 94 ; Hani. Des. Cat. 



