316 



smooth, dull dirty wliite under a tliin asli-coloured epidermis ; ven- 

 tral edge straight or subretuse in the middle ; dorsal slightly con- 

 vex and very little sloping in front, moderately sloping behind ; 

 front extremity rounded, the hinder rounded but attenuated ; fold 

 and flexure obsolete. 



Conception, Chili. 



A fossil-like shell, wliich much resembles an elongated and 

 swollen Edentula. 



185. Tellina Balthica (pi. lix. f. 121.) Lin. Sys. 1120; 

 Chem. vol. 6. f. 128. Hani. Des. Cat. p. 72. t. 4. f. 85. 



T. testa suborbiculari, subtrigona, solida, sequilaterali, subven- 

 tricosa, albida aut paUide carnea, intus plerumque rosea, laevigata ; 

 margine ventrali arcuato et postice sursum acclinato ; dorsali antico 

 brevi, subdeclivi, et prope nates promiuentes subrecto, deindeque 

 convexo; margine ligamentaK subrecto aut convexiusculo, et valde 

 dechvi ; latere antico rotundato ; extremitate lateris postici angulati 

 rotundata ; ligamento maguo, prominente ; flexura costaque um- 

 bonali obsoletis ; dentibus parvis. 



Suborbicular, slightly triangular, thick, equilateral, more or less 

 ventricose, white or pale flesh coloured, wdth the interior usually 

 rosy, smooth, not glossy; ventral edge arcuated, rising behind; 

 front dorsal edge, short and not much sloping, nearly straight ad- 

 jacent to the prominent beaks, becoming convex subsequently; 

 hinder dorsal edge nearly straight or but slightly convex, much 

 sloping ; anterior side rounded ; posterior side angulated, but with 

 the tip rounded ; hgament large, and prominent ; fold and flexure 

 obsolete; teeth smaU. 



Baltic. 



Easily distinguished from the allied species, by its more rounded 

 shape, its ventricoseness, and arcuation of its lower edge. T. Fab- 

 ricii wliich approaches it in these respects, is less angulated beliind. 



186. Tellina fusca (pi. lix. f. 117.) Psammobia fusca, 

 Sa^, Jour. Ac. Nat. Sc. Philad. 5. p. 220. Sanguinolaria fusca 

 Conrad. Am. Mar. Cone. p. 34. t. 7. f. 1; Gould, Inv. Massa. 

 p. 66. f. 42. 



T. testa obovata, soHdiuscula aut subtenui, subsequilaterali, 

 compressa aut convexiuscula, subimpolita, albida, epidermide tenu- 

 issima cinerascente induta, laevigata ; margine ventrah maxime et 

 regulariter arcuato; dorsali utrinque subdechvi, antice arcuato, 

 postice subrecto; latere antico rotundato; postico subangulato; 



