310 



DONAX. 



32. obesus (f. 42, 43), If Orb. — Testa parva, abbreviate crassA, 

 tumida, trigonfi, alba, fulvo fasciata, seu purpurea, liueis dorsali- 

 bus purpureis ornata, minutissime punctato-strinta,; umbonibus 

 elevatis, latere antieo acuminato, latere postico angulato, area 

 postangulari angulatim convexa. — This remarkable little species 

 is sculptured by punctured strife, not concentric, crossing the 

 radiating striae. 



33. punctato-striatus (f. 49, 50), Hani. — Solida, ventricosa, 

 trigona, striis punctatis radiata, albida carnea lilaeea seu pur- 

 pureo-radiata, umbonibus elevatis tumidis, angulo postico obtuso 

 plus minusve declivi, area postangulari rectiuscula, prope margi- 

 nem ventralcm rotiindatiin producto, prope umbones complanato ; 

 latere antieo attenuatim acuminato, margine ventrali medio in- 

 flate, postice ante angulum subcontracto. — An easily distinguished, 

 stout shell, with characteristic strongly-punctured grooves or striae;. 



34. Conradi (f. 51), Desk. — Testa I). punctalo-driala simili 

 sed magis depressa, postice magis angulatim products, antice 

 magis elongata. — It is not quite easy to distinguish this species 

 from the last, on account of intermediate specimens. It is how- 

 ever flatter, not so pinched up in front, and more produced be- 

 hind. 



35. contustjs (f. 53, 55), lieeve. — Testa quam D. Conradi 

 magis compressa, baud tantum ineequilaterali.- — The three last 

 species, punctate-striated in the same way, exhibit a perplexing 

 gradation in degree of flatness and production of the posterior 

 side. 



3d. Californictjs (f. 54, and var. D. culler, Reeve, p. 56, 57), 

 Conrad. — Testa oblongii, subsequilaterali, minutissime punctato- 

 striata, superne sublsevigata, alba, pallide purpurco radiata vel sub- 

 viridi, ad umbones carnea, purpurco nebulata, obscure biradiata, 

 postice producta, obscure biangulata, area postangulari convexa, 

 elevata, antice attenuatim subacuminata, margine ventrali prope 

 angulum subcontracto, ante medium plus minusve convexo. — 

 There is some difficulty in identifying this shell from the original 

 description, but I have not much doubt about it; some specimens 

 of the last species come very near to it, particularly about the 

 umbones, which are very peculiarly coloured, but the shells of 

 this species are narrower. The swelled and elevated character of 

 the back area is easily observable. The gradation of specimens, 

 however, prevents our separating the varieties named D. culler. 



37. deltoides (f. 100, 101), Lamk. — Tesla magna, solida, 



