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 iu 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 rounded; its 

 dorsal edge arched and moderately sloping ; ligament prominent ; 

 fold obsolete ; beaks rather prominent and acute ; teeth extremely 

 narrow, and usually obsolete. 



Britain ; Europe ; Senegal. 



190. Tellina irus (pi. lx. f. 145.) Hauley, Zool Proc. 

 1844. 



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

 subsequilaterali, 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 dechvi ; latere antico 

 paululum breviore, rotundato ; postico interne angulato ; lunula 

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

 subobsoleta ; dentibus satis magnis. 



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

 dull dirty white both within and without, the surface roughened 

 by minute concentrically arranged but unconnected elevated wrin- 

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

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

 front 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. Cuming and Walton. 



191. Tellina fragilis (pi. lvi. f. 14. and lx. f. 149.) Lin. 

 Syst. 1117; Chem. vol.vi. f. 84; Philip. Mol. Sic. p. 28; Poli. 

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

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

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



T. testa ovato-trigona, solidiuscula, subpellucida, valde ina5qui- 

 laterali, satis tmnida, subiinpolita, albida aut pallide crocea, ad 

 umbones flavescente aut crocea, striis remotiuscnlis elevatis concen- 

 trice aspera ; margine ventrali convexo, postice sursum acclinato ; 



