299 



Costa Cat. Test. Sicil. 20. t. 2. f. 7.; Tellina Costse Philip. En. 

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



T. testa ovata aut ovali-oblonga, tenuiuscula, inaequilaterali, 

 valde convexa, subnitida, laevigata, extus intusque albida, tunbo- 

 nibus hyalinis et plerumque pallide aiirantiis ; margine ventraK sa- 

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

 lum declivi ; latere antico longiore ad extremitatem rotundato ; 

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

 curvatis ; costa umbonali satis distincta, hand autem conspicua ; 

 ligamcnto iiifosso ; dentibus parvis. 



Varying from ovate to oval-oblong, rather thin, inequilateral, 

 not very glossy, smooth, both within 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 belnnd, 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 inclining 

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

 tolerably evident ; teeth small. 



Very closely resembling Plebeia, but proportionally more ventri- 

 cose, with the ventral edge less arcuated, &c. 



Mediterranean. 



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

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



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

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

 gine ventrali convexo aut subarcuato ; dorsab antice prope nates 

 recto et paululum declivi, postice recto satisque declivi • latere an- 

 tico longiore, rotundato ; extremitate postica obtuse angulata ; liga- 

 mento infosso ; costa umbonali conspicua ; flexura obsoleta. Var. 

 Ovata ; casta umbonali minus conspicua ; umbonibus saepe albidis. 



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

 both within and without whitish, with the umbones 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 ligamental 

 edge straight and sloping ; ligament sunken ; flexure obsolete. 



Var. (from Africa) ovate, the ventral edge more regularly 

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

 less. 



Real Leijos, Central America; Senegal. 



