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 ; ligainental edge 

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

 fold and flexure obsolete ; lateral tootli small, apjjroximate. 



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.) Sa^/, Amer. Conch, 

 pi. 64. f. 2. 



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

 iuscula, vix nitida, hand solida, extus intusque alba, lineis exilibus 

 elevatis concentrice asperata ; margine ventraU convexo et postice 

 sursum subacclinato ; dorsali utriuque declivi, antice convexo, 

 postice subrecto; latere postico breviore, et inferne obtusissime 

 angulato ; extremitate antica rotundata ; natibus acutis ; ligamento 

 subinfosso ; flexura costaque umbonali hand conspicuis ; dente la- 

 terali hand magno, hand approximate. 



Rounded ovate, moderately inequilateral, more or less cdnvex, 

 not soHd nor higlily polished, wliite both witliin and without, 

 most delicately striated by raised concentric lines, (wliich however 

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

 somewhat rising posteriorly ; dorsal edges slopmg, 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, sublgevigata, aut concentrice tenuissime 

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

 vexiusculo; latere antico rotundato, paulo breviore; extremitate 

 postica obtuse subangulata ; ligamento prominulo ; flexuia costaque 

 umbonali obsoletis ; dente laterali parvo, approximato. 



Small, subtriangularly orbicular, thin, ventricose, nearly smooth, 

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

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

 dorsal edges sloping and moderately curved ; anterior side rather 

 the shorter, rounded ; hinder extremity obtusely subangulated ; 



