312 DONAX. 



umbonibus perelevatis, inargine ventrali antice subcontracto, 

 postice convexo. — This curious species is distinguished by the 

 sculpture of the posterior area and the short straightness of the 

 posterior side, and other peculiarities of form. I see no distinction 

 in this from D. Dgsoni. 



44. radians (f. 91, 92, 93, 94, 95), Lamk. — Testa ovato-sub- 

 trigona, brevi, coloribus variis faseiata et maculata, antice et medio 

 sublrevigata, vel leviter lirata, postice valide rugata, angulo postico 

 obtusissimo, area postangulari convexa, margine ventrali prope 

 angulum subcontract, medio convexo, intus laevigata. — This 

 small, obtuse species is very variable in colouring and even in 

 form. The ridges are irregular, strong at the back, and more or 

 less obliterated in the middle. Eig. 95 probably represents D. 

 villains, Lauxk. 



45. Eaba (f. 108, 109), Chemn. — Quam B. radians magis 

 elongata. — Lamarck quotes the figures in Chemnitz and the En- 

 cyclopaedia for his D. radians. Had this been correct, Chemnitz's 

 name must have been adopted by the law of priority. But the 

 figures thus referred to show a much more elongated shell, which 

 agrees with the shells which we now figure. It is doubtful, how- 

 ever, whether the distinction can be well maintained. 



46. abbreviates (f. 106, 107), Lamk. — Testa suborbiculari, 

 compressa, alta, laevigata, grisea vel alba, roseo trifasciata, postice 

 brevi, rugosa, obtusissime angulata, margine antico-dorsali declivi, 

 margine ventrali convexo, intus laevigata. — Flat, almost rounded, 

 with granulated, undulating ridges on the back area. 



47. ovalinus (f. 104), Desk. — Testa compressa, ovato-subro- 

 tunda, laevigata, cinerea vel radiatim maculata ; latere autico brevi 

 subrotundatim convexo, margine ventrali rotundato, intus lsevi. — 

 A rounded, flat, Telliua-lookiug shell. 



48. nuculoides (f. 105), Reeve. — Subovata, plano-convexa, 

 albida, epidermide subviride nitente induta, latere antico subro- 

 tundo, margine antico-dorsali declivi, margine ventrali convexo, 

 postice prope angulum parum contracto, intus laevigata, latere 

 postico obtuse angulato, margine convexo. — -Another Tellina-like 

 species, without markings and more oval than I), ovalina. 



49. inceratus, (f. 112), Reeve. — Testa subovata, tenuissima, 

 laevigata, pallide carneo-rosea, latere postico brevi, subrotundato, 

 subtlexuoso, margine ventrali medio inflato, prope terminos sub- 

 incurvo, intus lsevi; latere antieo declivi, acuminato. — I have not 

 had the opportunity of examining this neat little shell, which was 

 originally drawn from a single valve in Mr. llanley's collection. 



