319 



Rounded-ovate, solid, subequilateral, convex or subventricose, 

 more or less glossy, smooth or with a few ridges of growth, very 

 variable in colouring, being white yellow orange or rosy ; ventral 

 edge arcuated in front, and rising behind so as to form a sharp 

 angle with the slightly convex and moderately sloping ligamental 

 margin ; anterior side very slightly the longer and roiuidcd ; its 

 dorsal edge arched and moderately sloping ; ligament prominent ; 

 fold obsolete ; beaks rather promuient and acute ; teeth extremely 

 narrow, and usually obsolete. 



Britain ; Em'ope ; Senegal. 



190. Tellina irus (pi. Ix. f. 145.) Emiley, Zool Proc. 

 1844. 



T. testa ovata aut obovata, crassa (in adultis), subventricosa, 

 subsequilaterah, impolita, extus intusque sordide albida; concen- 

 trice rugosa, rugis interruptis, minutis, confertissimis, elevatis; 

 margine ventrali magis minusve arcuato ; dorsali antice convexo et 

 subdeclivi, postice convexiusculo elongato decKvij latere antico 

 paululum breviore, rotundato; postico inferue angulato; lunula 

 (in adultis) parva, profunda ; ligamento infosso ; costa mnbonali 

 subobsoleta; dentibus satis magiiis. 



Ovate or obovate, solid, coarse, subventricose, subequilateral, 

 dull dirty white both within and without, the sui'face roughened 

 by minute concentrically arranged but unconnected elevated wrin- 

 kles (reminding one of those upon Rugosa but on a much smaller 

 scale), wliich however are usually (except in portions) abraded ; 

 fi'ont dorsal edge convex after passing the small but distinct lunule ; 

 ligamental edge not greatly convex, and decidedly sloping so as to 

 form an angle with the more or less arched ventral margin ; beaks 

 inclining to the rounded extremity of the shorter anterior side ; 

 ligament sunken but distinct ; a large bifid and a simple scarcely 

 rudimentary tooth in one valve, two rather strong diverging obtuse 

 ones in the other. 



Guinea? Mus. Cmning and Walton. 



191. Tellina fragilis (pi. Ivi. f. 14. and Ix. f. 149.) Lin. 

 Syst. 1117; Chem. vol.vi. f. 84; Pliilip. Mol. Sic. p. 28; Poll. 

 Test. Sic. 1. 15. f, 22, 24 ; Petricola ochroleuca. Lam., no. 2 ; Payr. 

 Cat. Cors. t. 1. f. 9, 10; Hani. Des. Cat. p. 52. sup. t.l. f. 6; 

 Psammobia fragilis, Turt. Biv. Brit. p. 88. t. 7. f. 11, 12. 



T. testa ovato-trigona, sohdiuscula, snbpellucida, valde infequi- 

 laterali, satis tiunida, subimpolita, albida aut pallide crocea, ad 

 umbones flavescente aut crocea, striis remotiuscvdis elevatis concen- 

 trice aspera ; margine ventrali convexo, postice sursmn accHuato ; 



2 a 2 



