I 



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.) Quoy and Gam., Voy. 

 Astrol. Zool. vol. iii. p. 500. t. 81. f. 1, 2, 3. 



T. testa subovata, solidiuscula, subcompressa, subpellucidu, 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 autico lato, 

 multmn breviore, rotundato ; postico attenuate, obtuse cuneiforini ; 

 ligamento infosso ; costu umbonali et fiexura ventrali inconspicuis ; 

 uatilms subacutis ; dentibus bifidis, subvalichs, simphcibus subob- 

 soletis. 



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

 smooth, somewhat glossy, white, one of the valves \\itli obsolete 

 concentric strife; the ventral edge convex and ascending poste- 

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

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

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

 tusely angdated, 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. 



Australia. 



180. Tellina proxima (pi. k\d. 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, Couihony, Boston Joum. 

 Nat. Hist. vol. ii. p. 59. t. 3. f. 11 ; Sanguinolaria sorchda, GouUy 

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

 Ross. Voyage. 



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

 convexiuscula, impolita, extus nlbidfi, intus candidii, epidernude 

 cinerascente fugaci induta, concentrice obsolete et subnnbncatim 

 striolata; margine ventrali magis minusve convexo; dorsali antice 

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

 brevi, et inferne subangulato ; extremitate postica rotundata ;^ nati- 

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

 bonah subobsoleta; dentiuni altero in utraiiue vdlxula bifurcato. 



Oboval, thinuish, fra^de, very inequilateral, more or less con- 



