277 



concentric lines ; ventral margin convex and rising beliind ; anterior 

 side produced, its dorsal edge tolerably convex and but little slop- 

 ing ; posterior side short and obtusely angulated ; ligamental edge 

 straightish or subretuse, more or less sloping ; ligament prominent ; 

 fold and flexure obsolete ; lateral tooth small, approximate. 



Hab.? 



The unique specimen which I purchased without a locality, is 

 now in the possession of H. Cuming, Esq. 



101. Tellina mera (pi. Ixvi. f. 268.) Say, Amer. Conch, 

 pi. 64. f. 2. 



T. testa ovato-suborbiculari, insequilaterali, convexa, aut convex- 

 iuscula, vix nitidfi, hand solida, extus intusque alba, lineis exihbus 

 elevatis concentrice asperata ; margine ventrali convexo et postice 

 sursum subacclinato ; dorsali utrinque dechvi, antice convexo, 

 postice subrecto; latere postico breviore, et inferne obtusissime 

 angulato ; extremitate antica rotundata ; natibus acutis ; hgamento 

 subinfosso ; flexura costaque umbonali hand conspicuis ; dente la- 

 terali hand magno, hand approximato. 



Rounded ovate, moderately inequilateral, more or less convex, 

 not solid nor higlily polished, wliite both within and \vithout, 

 most delicately striated by raised concentric lines, (which however 

 are scarcely visible in the young) ; ventral margin convex, and 

 somewhat rising posteriorly ; dorsal edges sloping, the front one 

 more or less straight, the liinder decidedly convex ; posterior side 

 the shorter, very obtusely angulated below ; anterior side rounded ; 

 beaks acute ; ligament rather sunken ; fold and flexure just evident ; 

 lateral tooth neither large nor approximate. 



Guayaquil ; south coast of U. States. 



102. Tellina cycladiformis (pi. Ivii. f. 61.) Hanley, Zool. 

 Proc. 1844. 



T. testa rotundato-subtrigona, tenui, ventricosa, intus extusque 

 incarnata aut pallide rosea, sublsevigata, aut concentrice tcnuissime 

 striolata ; margine ventrali convexo ; dorsali utrinque declivi, con- 

 vexiusculo; latere antico rotundato, paulo bre\aore; extremitate 

 postica obtuse subangulata ; hgamento prominulo ; flexura costaque 

 umbonali obsoletis ; dente laterali parvo, approximato. 



Small, subtriangularly orbicular, tliin, ventricose, nearly smooth, 

 (or marked with most minute concentric strire), both within and 

 without of a pale rose or flesh-colour; ventral edge convex, both 

 dorsal edges sloping and moderately curved ; anterior side rather 

 the shorter, rounded ; hinder extremity obtusely subangulated ; 



