256 



forwards ; ligament sunken ; edges of the almost terminal umbonal 

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

 conspicuous; inside pure glossy white; lateral teeth large, the 

 anterior approximate. 



St. Nicholas, Zebu. 



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

 I do not venture to assert its identity, as the figure certainly differs 

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

 conversant with the figure, have quoted it. 



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

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

 Quoij 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, sohda, sub- 

 insequivalvi, convexa, subsequilaterah, impohta aut vix nitidiuscula, 

 intus extusque albida, sublaevigata ; margine ventraH in medio 

 subrecto, utrinque sursum acchvi ; dorsah antice vix declivi, pos- 

 tice valde dechnente incurvato ; latere postico subcuneiforrai, ad 

 extremitatem subangulato; extremitate antica obtusa; natibus 

 prominentibus, recte incurvatis; flexura costaque umbonah dis- 

 tinctis; ligamento magno, infosso; dentibus laterahbus parvis, 

 antico approximato, postico remoto plerumque subobsoleto. 



Yar. Latere antico baud ddatato ; margine dorsali antice magis 

 declivi, postice recto haudque incurvato. 



Shell varying in shape from ovate-triangular to suborbicular- 

 triangular, sohd, sUghtly inequivalve, convex, subequilateral, scarcely 

 if at all glossy and usually quite duU chalky wliite, nearly smooth 

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

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

 fold and umbonal ridge distinct ; iDcaks prominent and incurved ; 

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

 slope sHght; 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. 



Var. Ligamental edge not incurved but straight ; anterior side 

 not dilated, slope stronger, and extremity rounded. 



Austraha. 



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

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



