319 



Ex3un(letl-ovate, solid, subpf|uilateral, convex or subventricose, 

 more or less glossy, sinoolh or with a lew ridges of growth, verv 

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

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

 angle with the slightly convex and moderately sloping bgamental 

 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. Ix. f. 145.) Ilanley, Zool Proc. 

 1844. 



T. testa ovata ant obovata, crassa (in adultis), subvcntricosa, 

 subsequilaterali, impoUta, extus intusque sordidc albida; concen- 

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

 margine veutrali magis miimsvc arcuato ; dorsali antice convexo et 

 subdeclivi, postice convexiusculo elongato dcclivi; latere antico 

 paululum breviore, rotuudato; postico inferne angulato; lunula 

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

 subobsoleta ; dentibus satis magnis. 



Ovate or obovate, solid, coarse, snbventricose, subcquilatcral, 

 dull dirty wliite both within and without, the surface roughened 

 by minute concentrically arranged but unconnected elevated wrin- 

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

 scale), wdiich 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 

 inchniug 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. Ivi. f. 14. and Ix. f. 149.) Lin. 

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

 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. 1. 1. f.G; 

 Psammobia fragihs, Ticrt. Biv. Brit. p. 88. t. 7. f. 11, 12. 



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

 laterali, satis timiida, subirapohta, allnda aut pallide crocea, ad 

 uinbones flavescente aut crocea, striis rcmotiusculis elevatis concen- 

 trice aspera; margine ventrali convexo, postice sursum acchuato; 



2 a2 



