25 



February 28, 1832. 



Wil]iam Yarrell, Esq., in the Chair, 



Specimens were exhibited of numerous MoUusca and Conchifera 

 hitherto undescribed, whicli form part of the collection raade by 

 Mr. H. Cuming during a voyage undertaken in 1827, 1828, 1829, 

 and 1830, for the purpose of obtaining subjects in natūrai history 

 on the western coast of South America, its adjacent islands, and 

 many of those vvhich form the principai Archipelago of the South 

 Pacific Ocean. The specimens exhibited on the present occasion 

 constituted the first portion of the collection, vvhich extends in 

 these classes to upwards of four hundred nevv species ; the whole of 

 which Mr. Cuming proposes to bring before the Committee from 

 time to time, as the descriptions of them are completed. The in- 

 tention of publishing coloured figures of all the new species wa8 

 announced. 



The nevv species brought, on this evening, under the notice of the 

 Committee vvere accompanied by characters and descriptions of 

 them byMr. Broderip and Mr. G. B. Sovverby, of vvhich the follovv- 

 ing is an abstract. 



Genus Ckiton. 

 * Ligamento marginis granoso. 

 Chiton Goodallii. Chit.testd ovali, olivaceo-Juscd ; valvis ter- 

 minalibus subradiatim granulosis, interrie striatis ; cceteris con- 

 centrice lineatis, interne medio serratis, areis lateralibus subra- 

 diatim granulosis ; limbo marginali granoso, olivaceo, cceruleo- 

 viridi vario : long. o, lat. 3 poli. 

 Hab. ad insulas Gallapagos. (James's Island.) 

 This fine species differs from Chit, olivaceus principally in the 

 absence of longitudinal strice on the centrai areas of the valves, 

 the coarser texture of the grains vvhich stud the border, and in the 

 colour of those grains, vvhich in Chit. olivaceus is a uniform shining 

 black, vvhile in the specimens of Chit. Goodallii that are not aged 

 the grains are of an olive brovvn dappled or even almost transversely 

 banded vvith coerulean green, going ofFtovvards the border in some 

 individuals into a more dusky hue. Some of the specimens of a 

 moderate size are beautifuliy marked on each side of the carina of 

 the seven posterior valves vvith short, transverse, closely zigzagged 

 lines of a light blue colour, about six in number. 



The older individuals vvere found in exposed situations ; the 

 younger under stones and ledges of rock at lovv vvater. — W. J. B. 

 Chiton Stokesii. Chit. testą ovatd, viridi-fuscd, i}itus viridi- 

 ccerided; valvd anticd posticcegue parte posticd granoso -rugosis, 

 intermediariim areis lateralibus granoso-radiatis : long. 2^, lat. 

 1^ poli. 

 [No. XVI.] ZooL. Soc. Pkoceedings of tuk Comm. of Science. 



