25 



February 28, 1832. 

 William Yarrell, Esq., in the Chair. 



Specimens were exhibited of numerous Mollnsca and Conchifera 

 hitherto undescribed, which form part of the collection made by 

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

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

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

 many of those which form the principal Archipelago of the South 

 Pacific Ocean. The specimens exhibited on the present occasion 

 constituted the first portion of the collection, which extends in 

 these classes to upwards of four hundred new 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 was 

 announced. 



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

 Committee were accompanied by characters and descriptions of 

 them by Mr. Broderip and Mr. G. B. Sowerby, of which the follow- 

 ing is an abstract. 



Genus Chiton. 



* Ligamento marginis granoso. 

 Chiton Goodallii. Chit, testa ovali, olivaceo-fuscd ; valvis ter- 

 minalibus subradiatim granulosis, interne striatis ; cceteris con- 

 centrice lineatis, interne medio serratis, areis lateralibus subra- 

 diatim granulosis ; limbo marginali granoso, olivaceo, coeruleo- 

 viridi vario : long. 5, lat. 3 poll. 

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

 This fine species differs from Chit, olivaceus principally in the 

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

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

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

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

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

 banded with ccerulean green, going off towards the border in some 

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

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

 the seven posterior valves with short, transverse, closely zigzagged 

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



The older individuals were found in exposed situations ; the 

 younger under stones and ledges of rock at low water. — W. J. B. 

 Chiton Stokesii. Chit, testa ovatd, viridi- fused , intus viridi- 

 cceruled ; valvd anticd posticceque parte posticd granoso -rugosis, 

 intermediarum areis lateralibus granoso-radiatis : long. 24, lat. 

 1^ poll. 

 [No, XVI,] ZooL, Soc. Pkoceedings of the Comm. of Science. 



