angulated below, or very obtusely wedge-shaped, the tip always 

 rounded ; fold not very distinct ; ligament sunken ; a distinct 

 short lunule ; teeth very large. 

 Guinea. 



This is probably the Abililgaardiana of Spengler. 



193. Tellina polygona (pi. lxii. f. 189.) Chemnitz, vol. vi. 

 p. 91. f. 77 ; Dillw. Des.Cat. p. 77 ; Hani. Des. Cat. p. 69. t. 3. 

 f. 11 ; T. inultangula, Gmel., 3230 ; Lam. no. 42. 



T. testa, ovato-oblonga, solida, veiitricosa, insequilateralij impo- 

 lita, extus intusque albida, Uneis elevatis confertis concentrice 

 striata, antice breviore, postice subcuneiformi ; margine ventrali 

 subrecto ; dorsali antice paululum declivi, postice longo subrecto 

 declivi ; extremitatc antica, obtusa ; postica attenuate et biangulata ; 

 llexura costaque umbonali perspicuis ; ligamento subinfosso ; den- 

 tibus magnis. 



Ovate-oblong, solid, ventricose, inequilateral, not glossy, whitish 

 within and without, roughened by coarse crowded concentric raised 

 striae, shorter in front, somewhat wedge-shaped behind ; ventral 

 edge straightish, but rendered wavy by two extremely obsolete and 

 subcentral radiating ridges ; anterior extremity obtuse, dorsal edge 

 short and scarcely at all sloping ; posterior tip narrow and bian- 

 gulated, the ligamental margin long straightish and sloping; fold 

 and flexure evident ; teeth large. 



Guinea. 



194. Tellina Bruguieri (pi. lxii. f. 192.) Hanley, Zool. Proc. 

 1844; Enc.Meth. t, 231. f. 2. 



T. testa, rotundato-trigona, solida, subrequilatcrali, convexa, im- 

 polita, extus intusque albida, sublrevigata, (aut striis exilibus ob- 

 soletis radiantibus strias concentricas tenuissimas decussantibus) ; 

 margine ventrali convexo aut subarcuato ; dorsali postice elevatiore 

 valde declivi et paululum convexo, antice arcuato et declivi ; ex- 

 tremitate antica obtusa ; postica rotundata, ; natibus prominentibus, 

 et antice incumbentibus ; hexura costaque umbonah obsoletis ; 

 ligamento infosso ; lunula parva ; dentibus maximis. 



Suborbicular, subtriangular, solid, nearly equdateral, convex, 

 white within and without, dull, nearly smooth, when closely ex- 

 amined some of the adult specimens present the appearance of a 

 most minute decussation, caused by the intersection of delicate 

 obsolete radiating lines and very fine concentric striae, which latter 

 are chiefly apparent near the convex or subarcuated ventral mar- 

 gin ; posterior dorsal edge abruptly sloping, slightly convex, and 



