313 



Closely resembling the last^ of which it is possibly a variety, but 

 is more triangular, and not so distinctly marked with radiating lines. 

 Guiana, Mexico, Florida. 



179. Tellina alba (pi. Ixii. f. 193.) Q^uoy and Gaim.j Voy. 

 Astrol. Zool. vol. iii. p. 500. t. 81. f. 1, 3, 3. 



T. testa subovata, solidiuscula, subcompressa, subpellucida, niti- 

 diuscula, extus intusque alba, sublsevigata ; margine ventrali con- 

 vexo et postice sursum acclinato; dorsali antice arcuato et vix 

 subdeclivi, postice elongato declivi et subrecto ; latere antico lato, 

 multum breviore, rotundato ; postico attenuato, obtuse cuneiformi ; 

 ligamento infosso ; costa umbonali et flexura ventrali inconspicuis ; 

 natibus subacutis ; dentibus bifidis, subvaHdis, simplicibus subob- 

 soletis. 



Subovate, tolerably strong, rather flat, semi-transparent, nearly 

 smooth, somewhat glossy, white, one of the valves with obsolete 

 concentric strise; the ventral edge convex and ascending poste- 

 riorly ; anterior side broad, and distinctly the shorter, rounded at 

 its extremity, arcuated and but httle sloping at its dorsal margin ; 

 the posterior side obtusely cuneiform, its tip attenuated and ob- 

 tusely angulated, its dorsal edge elongated scarcely convex and 

 obHquely sloping; beaks rather prominent; ligament sunken; 

 umbonal ridge not conspicuous ; the bifid teeth rather strong, the 

 simple nearly rudimentary. 



In all the specimens I have seen, there are two or tliree obsolete 

 radiating folds at ths anterior extremity. 



AustraHa. 



180. Tellina proxima (pi. Ixvi. f. 264. and lix. f. 115.) 

 Brown in Zoology to Beechey, p. 154, t. 44. f. 4; Pliil. Ab. und 

 Bes. Conch, part 9. pi. 5. f. 4 ; T. sordida, Couthouy, Boston Jonrn. 

 Nat. Hist. vol. ii. p. 59. t. 3. f. 11 ; Sanguinolaria sordida, Gould, 

 Invert. Massachusetts, p. 67 ; Macroma tenera. Leach, Appendix 

 Ross. Voyage. 



T. testa obovali, tenuiuscula, valde insequilaterali, convexa aut 

 convexiuscula, impohta, extus albida, intus Candida, epidermide 

 cinerascente fugaci induta, concentrice obsolete et subimbricatira 

 striolata ; margine ventrali magis minusve convexo ; dorsali antice 

 arcuato et paulo decHvi, postice recto et valde declivi ; latere postico 

 brevi, et inferue subangulato ; extremitate postica rotundata ; nati- 

 bus plerumque erosis ; ligamento magno, prominente ; costa um- 

 bonaU subobsoleta ; dentium altero in utraque valvula bifurcato. 



Oboval, thinnish, fragile, very mequilateral, more or less con- 



