Zoological Society. 303 



costatd, fused, macidis albis, superne nigro-marginatis, sparsim 

 et irregulariter ornatd ; umbonibus centralibus, subobliquis. 

 Conch. Icon., Pectunculus, pi. 7. f. 38. 

 Hab. West Indies. 



Pectunculus ca-ncellatus. Pect. testd oblique Pectiniformi, striis 

 subtilissime cuncellatd ; albd, epidermide luted holosericd partim 

 indutd ; umbonibus prominentibus , centralibus. 

 Conch. Icon., Pectunculus, pi, 7. f. 39. 



Hab. Singapore (found in sandy mud at the depth of seven to ten 

 fathoms) ; Cuming. 



This little shell is very thin and fragile, and perfectly white ; the 

 entire surface being delicately cancellated and covered towards the 

 margin with a thick pale yellow epidermis. There is no possibility 

 of confounding it with any other species. 



Pectunculus morum. Pect. testd sub-Pectiniformi, pallide pur- 

 pureo-rubrd, maculis rubidis elotigatis sparsim et irregulariter 

 pictd; radiatim costatd, costis Icevibus ; umbonibus subcentralibus. 

 Conch. Icon., Pectunculus, pi. 7. f. 40. 

 Hab. Madagascar? 



A very pretty species, in which the ribs radiate somewhat more 

 obliquely than usual; the general appearance of the shell is not 

 much unlike that of the P. tessellatus ; it is however lighter and more 

 depressed, with colour and spotting of somewhat different character. 



Pectunculus Siculus. Pect. testd orbiculari, depressiusculd, sub- 

 cequilaterali, longitudinaliter sulcatd et striatd ; rubido-castaned, 

 fusco transversim zonatd, zonis scepi obscuris ; umbonibus testce 

 junioris interdum albimucidatis . 

 Conch. Icon., Pectunculus, pi. 7. f. 41. 



Pectunculus glycimeris, Lamarck, Philippi. 

 Testa junior. 



Area bimaculata, Poli. 

 Hab. Mediterranean, coast of Sicily. 



Having adopted the old P. glycimeris of British authors, I distin- 

 guish the P. glycimeris of Lamarck by the above new title. Through 

 some unaccountable neglect, these two very different shells have been 

 hitherto pubUshed under the same title, and it is hoped that this 

 present amendment will be appreciated. 



Pectunculus perdix. Pect. testd orbiculato-eordafd, subauritd, 

 radiatim costatd ; costis planulatis, subindistinctis, longitudinaliter 

 striatis, strigis rubido-fuscis, transversis, angulato-undatis, pro- 

 fuse pictis. 

 Conch. Icon., Pectunculus, pi. 8. f. 46. 



Hab. Straits of Malacca (found in mud at the depth of seventeen 

 fathoms) ; Hinds. 



The form of this shell approximates very closely to that of the 

 Pectunculus zonalis, but the painting of it is of a very different cha- 

 racter. The beautiful specimen here figured, collected by SirE. Bel- 

 cher, is the only example of the species I have seen, with the excep- 

 tion of a small, worn, odd valve in the collection of M. Deshayes. 

 Pectunculus spadiceus, Pect. testd orbiculari, radiatim striatd. 



