Cmta Cat. Test. 8icil. 20. t. 2. f. 7.; Tellina Costa? mU'qu Eu. 

 Mol. Sic. 1. p. 28. t. 3. f. 11. 



T, testa ovata aiit ovali-oblonga, teiniiuscula, infcquilaterali, 

 valcle convexa, subnitida, laevigata, extiis iiitusque albida, nmbo- 

 nibus hyalinis et pleruuique pallide aui-antiis ; margiiie ventrali sa- 

 tis convexo; dorsali utrinque subrecto, postice satis, antice pauki- 

 lum declivi; latere antico loiigiore ad extremitatem rotundato; 

 postico angustato, obtuse subtruncato ; natibus acutis, et reete in- 

 curvatis ; eosta umbonali satis distincta, hand autem conspicua ; 

 ligamento infosso ; dentibus parvis. 



Var>nng from ovate to oval-oblong, rather thin, inequilateral, 

 not very glossy, smooth, both \^•itllin and without whitish, with the 

 umbones usually hyaline and often tinged with orange ; ventral 

 edge moderately convex, but not arcuated ; dorsal edges nearly 

 straight, sloping beliind, and but moderately so in front ; anterior 

 side the longer and rounded at its termination ; posterior side nar- 

 rowed, and obtusely subtruncated ; beaks acute and not inchning 

 to either side ; ligament sunken, umbonal ridge not prominent but 

 tolerably evident; teeth small. 



A^ery closely resembling Plebeia, but proportionally more ventri- 

 cose, \nth the ventral edge less arcuated, &c. 



Mediterranean. 



149. Tellina plebeia (pi. lix. f. 129, and f. 151.) Hanley, 

 Zool. Proc. 1844.; Psammobia laevigata (?) Lamarck. 



T. testa subovata, solidiuscula, convexa, subnitida, laevigata, in- 

 tus extusque, albida, umbonibus hyahnis et rubro-aurantiis ; mar- 

 gine ventrah convexo ant subarcuato; dorsaH antice prope nates 

 recto et paululum declivi, postice recto satisque decHvi ; latere an- 

 tico longi ore, rotundato; extremitate postica obtuse angiUata ; liga- 

 mento infosso ; costa umbonali conspicua ; flexura obsoleta. \^ar. 

 Ovata ; casta umbonali minus conspicua ; umbonibus sgepe albidis. 



Subovate, tolerably strong, convex, not very glossy, smooth, 

 both within and without whitish, with the lunbones hyaline and 

 orange-red ; ventral edge convex or subarcuated ; anterior side the 

 longer, rounded, its dorsal edge straight and scarcely sloping near 

 the beaks ; posterior extremity obtusely angulated, the hgamental 

 edge straight and sloping ; ligament sunken ; flexure obsolete. 



A'ar. (from Africa) ovate, the ventrtil edge more regularly 

 arcuated, the fold less prominent, and the imiboncs often colour- 

 less. 



Eeal Leijos, Central America ; Senegal. 



