316 



smooth, dull dirty white under a thin ash-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, winch 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 pallide carnea, intus plerumque rosea, laevigata ; 

 margine ventrali arcuato et postice sursum acchnato ; dorsali antico 

 brevi, subdechvi, et prope nates prominentes subrecto, deindeque 

 convexo ; margine ligamentah subrecto aut convexiusculo, et valde 

 declivi ; latere antico rotundato ; extremitate lateris postici angulati 

 rotundata ; ligamento magno, prominente ; flexura costaque um- 

 bonali obsoletis ; dentibus parvis. 



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

 ventricose, white or pale flesh coloured, with 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 ; ligament large, and prominent ; fold and flexure 

 obsolete ; teeth small. 



Baltic. 



Easily distinguished from the allied species, by its more rounded 

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

 ricii which approaches it in these respects, is less angulated behind. 



186. Tellina eusca (pi. bx. f. 117.) Psammobia fusca, 

 Say, 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, solidiuscula aut subtenui, subsequilaterah, 

 compressfi aut convexiusculfi, subimpolita, albida, epidermide tenu- 

 issmia cinerascente induta, laevigata ; margine ventrali maxime et 

 regulariter arcuato; dorsali utrinque subdectivi, antice arcuato, 

 postice subrecto ; latere antico rotundato ; postico subangulato ; 



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