320 



dorsali utrinque satis decK\aj autice convexo, postice prope nates 

 subretuso deindeque couvexiusculo ; latere autico rotundato, bre- 

 viore ; postico obtuse acuminato et paulidum subrostrato ; natibus 

 obtusis; flexura costaque uinbouali obsoletis; superlicie iutema 

 plerumque crocea; dentibus satis magnis. 



Var. Magis elongata, tumida ; striis lamellosis ; margine ven- 

 trali minus convexo ; extremitate postica obtuse biangulata. 



Ovate-trigonal, moderately solid, slightly pellucid, very inequi- 

 lateral, rather tumid ; almost devoid of glossiness, whitish with a 

 tinge of yellow or saffron colour (wliicli sometmies but rarely per- 

 vades the entire surface) upon the umbones ; rough with concen- 

 tric elevated rather distant striae; ventral edge convex; dorsal 

 sHghtly refuse on either side of the obtuse beaks, and then convex 

 and rather sloping in front, scarcely convex but decidedly sloping 

 behind ; anterior side short and rounded ; posterior obtusely acu- 

 minated and very slightly subrostrated ; fold and flexure obsolete ; 

 inside usually of a saffron colour ; teeth rather large, two diverging 

 ones in one valve, a recurved one in the other. 



Var. Elongated and not at all triangular, tumid; the striae 

 lamellar ; ventral edge scarcely at all convex ; liinder end obtusely 

 biangulated. 



Scarcely a Tellina, but with the teeth and general characters of 

 so many usually included in that genus, that I know not how to 

 separate it. From the figure in Delessert, the Psammotaa Tarentina 

 of Lamarck is probably a variety of this shell. 



Britain, Eui'ope. 



192. Tellina Guinaica (pi. lix. f. 130.) Chemnitz, vol. xi. 

 p. 348. f. 1651, 1652, 1653 ; Dillw. Des. Cat. p. 69 ; T. polygona, 

 Gmel.; Lam. no. 43. 



T. testa ovata, solida, ventricosa, impolita, insequilaterah, extus 

 intusque albida, lineis rudioribus subremotis elevatis concentrice 

 striata ; margine ventrali magis minusve convexo ; dorsali postice 

 subdeclivi et subrecto, antice magis declivi et subincurvato ; latere 

 antico brevi, rotundato ; latere postico rotundato-angulato aut obt* 

 sissime cuneiformi, extremitate ejus semper rotundata ; costa um- 

 bonali subinconspicua ; lunula chstincta ; hgamento iufosso ; denti- 

 bus magnis. 



Ovate, solid, ventricose, duU, inequilateral, within and without 

 whitish, roughened by coarse raised concentric and rather distant 

 strife; ventral edge more or less convex; dorsal edge straight if^h 

 and not much sloping behind, more sloping and somew hat inciu'ved 

 in front ; anterior side short and rounded ; posterior somewhat 



