278 



ligament tolerably large, and somewhat prominent ; fold and flex- 

 ure obsolete; lateral tooth small, approximate. 

 San Nicolas, Zebu. 



103. Tellina Listeri (pi. lxv. f. 251.) Ilanley, Zool. Proc. 

 1844; Lister, Hist. Cone. t. 288. f. 235; T. scutra Gould, Proc. 

 Boston Nat. H. Soc. 



T. testa obovata, solida, ventricosa, (antice sub ventricosa), sequi- 

 laterali, glabra, extus intusque Candida ; margine ventrali medio 

 subrecto ; dorsali antice arcuato paululumque deebvi, postiee recto 

 et declivi ; latere antico dilatato, obtuse rotundato ; postiee obtu- 

 sissime biangulato ; ligamento magno, infosso ; natibus obtusis ; 

 umbonibus plerumque subplanulatis ; flexura costaque umbonali 

 satis distinctis ; dente lateraH parvo subapproximato. 



Obovate, solid, more or less ventricose, equilateral, white botli 

 externally and internally, almost smooth, (being merely marked 

 with the concentric wrinkles of growth), rather glossy; the ventral 

 edge nearly straight in the middle ; the anterior side dilated, its ex- 

 tremity obtusely rounded, its dorsal edge scarcely sloping and much 

 arcuated ; hinder extremity most obtusely biangulated, the dorsal 

 edge straight and much sloping; umbonal ridge and ventral flexure 

 not very conspicuous ; ligament large and sunken ; umbones rather 

 flattened ; beaks obtuse ; lateral tooth small, and nearly approxi- 

 mate. 



Senegal. 



104. Tellina itoequalis (pl.lvii. f.44.) Ranley, Zool. Proc. 

 1844. 



T. testa subovata, valde insequilaterali, solida, convexa, Candida, 

 tenuiter striata; striis superne obliquis, inferne concentricis, flex- 

 uosis ; supra costam umbonalem inconspicuam, rugis erectis flex- 

 uosis asperata; margine ventrali convexissimo ; dorsali antice 

 subincurvato et valde declivi, postiee brevi recto subdeclivi ; latere 

 antico producto, ad extremitatem attenuato, rotundato ; extremitate 

 postica obtusa ; natibus acutis ; lunula distincta ; superficie interna 

 Candida, aut flavescente ; dente laterali magno, subremoto. 



Subovate, very inequilateral, solid, convex, white with fine striae, 

 which are oblique near the acute beaks, but become concentric 

 and flexuous towards the very convex ventral margin ; the surface 

 beyond the umbonal ridge (which is not prominent), covered with 

 elevated flexuous oblique wrinkles, which project so as to form 

 three radiating lines; anterior side produced, attenuated but 

 rounded at the extremity, its dorsal line rather concave and greatly 



