317 



natibus parvis acutis, prominentibus ; flexura costaque umbonali 

 obsoletis, ligamento prominulo ; dentibus angustissimis. 



Obovate, rather thin, nearly if not quite equilateral, more or 

 less compressed or but slightly convex, scarcely at all glossy, whit- 

 ish under a thin ashy epidermis, smooth ; ventral edge regularly 

 and greatly arcuated; the dorsal edges not much sloping, arched in 

 front, and nearly straight behind ; anterior side rounded, posterior 

 subaugulated ; beaks small, acute, and prominent ; ligament rather 

 projecting ; fold and flexure obsolete ; teeth very narrow. 



" Its varieties in size, strength, and colour, are very great. In 

 muddy bays, they grow to a larger size, and are thick and of a 

 blueish and, sometimes, a rusty colour, and covered with a firm 

 dark epidermis. In clean sandy localities they are very thin, pure 

 white, or sometimes of a delicate rose or lemon colour, and the epi- 

 dermis very slight." — Gould. 



North America. 



187. Tellina inconspicua* (pi. lix. f. 120.) Broderip and 

 Sow., Zool. Jour. vol. 4. p. 363 ; Zool. to Beech. Voy. t. 41. f. 6. 

 Hani. Des. Cat. p. 72. 



T. testa, Solidulse affini, sed impolita et epidermide fusco-cinc- 



* A species which bears some resemblance to a young Inconspiena, 

 or Fusca, but which nevertheless is probably distinct, at least judging 

 from the figure, for I have never been able to procure a specimen of 

 the shell, is the 



Tellina petalum (pi. lxvi. f. 263.) Valenciennes in Zool. to 

 Humb. and Bonpl. Voy. vol. ii. p. 222. t. 48. f. 2. 



T. testa subovata, tenuiuscula, fragili, subaequilaterali, compressius- 

 cula, sublfevigata, superne subrosea, inferne albido-lutcfi, zonis sub- 

 roseis plerumqne ornata ; margine ventrali satis convexo ; dorsali an- 

 tice convexo et subdeclivi, postice convexiuseulo et declivi ; latere 

 antico rotundato ; postico subangulato ; ligamento parvo, brevi ; den- 

 tibus lateralibus nullis. 



Subovate, thinnish, fragile, nearly inequilateral, rather compressed, 

 nearly smooth, merely marked with the striaj of growth, somewhat rosy 

 near the beaks, becoming pale yellowish with rosaceous zones towards 

 the ventral edge, which is but moderately convex ; front dorsal edge 

 convex and not much sloping, hinder one but slightly convex and 

 decidedly sloping ; anterior extremity rounded ; posterior side suban- 

 gulated ; ligament short and small ; teeth small, no lateral ones. 



Acupulco. 



2 A 



