ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 189 



The following species occur in Sowerby's Thesaurus Conchyliorum, on 

 the authority of Mr. Cuming. 



No. Page. Plate 



Fig. 



Locality. 



12 

 15 



51 



38 



118 



36 



38 



76 



48 

 52 

 53 

 21 



69 



71 



70 



85 



169 



86 



129 

 163 



284 



479 



529 



576 

 577 



577 

 618 



179 

 179 

 178 

 182 

 186 



39,40 



41,42 



112-13 

 71 



42 

 153-5 



59,77 



60 



48 



155-6 

 280-2 



Lima angulata, Sow 



- arcuata. Sow < 



Columbella cribraria, Lam 



Terebra frigata, Hds.='Y. gracilis. Gray. 



Tellina virgo, Hani. P. Z. S. 1844, p. 143 



Marginella coerulescens, Lam. = M.. pru- 



num, Gmel. [not M. sapotilla, Hds.'\ 



Ovulum gibbosura, Lam 



"1 Neritina Michaudii, Reel. Rev. Zool. 1 

 J 1841, p. 315. J 

 Bulla Quoyii, Grat/, MS 



- nifolabris, A. Ad. 



- punctata, A. Ad 



Cytherea undulata, Sow.jun. = C. planu- 



lata, var., Sow. sen. 

 Cerithium ocellatum. Sow. [not Brug."] 

 = C. in-oratum [non] interruptum, Gd. 



— nebulosum, Soto 



= C. maculosum, Kien. 



— adustum. Sow. non Kien 



? = C. maculosum, var. 



— Gallapaginis, A. Ad. 



?= interruptum, Mie. 



— varicosum, Sow 



u. coral 

 sdy. m. 

 s. 

 ,sd. 



cor. sd. 

 fine sd. 

 sdy. m. 

 sdy. m. 



Panama. 



Ld. Hood's Is. 



Panama. 



Pan., very common, 



Galap. 



Cbii-iqui, W. Col. 



Panama. 



Panama. 



Panama, 



Galap. 

 Galap. 

 Panama. 

 Salango. 



Gulf Cal., Galap. 



Galapagos. 



Galapagos. 



Galapagos. 



RealLlejos, atroots 

 of mangroves. 



33. At the very time that Mr, Cuming was prosecuting his researches on 

 the West Coast of South America, the Chevalier Alcide D'Orbigny was 

 engaged in a similar exploration of the continent generally, from the years 

 1826-1833. In July 1833, he reached the Pacific coast at Arica, whence he 

 proceeded to Callao, stopping at Cobijo, Islay, and Arequipa. Thence he 

 returned to Eui'ope via Valparaiso. The result of his labours is described 

 in the " Voyage dans I'Amerique Meridionale, le Bresil, la Republique 

 Orientale d'Uruguay, la Republique Argentine, la Patagonic, la Republique 

 du Chili, la Republique de Bolivia, la Republique de Perou, execute pen- 

 dant les annees 1826-1833, par Alcide D'Orbigny. Mollusca, Paris, 1847." 

 Among the services rendered to malacological science by Dr. Gray*', it is 

 not the least that he has obtained the type specimens described in this work 

 for the British Museum, where they may be seen by students on application. 

 The sea-shells are frequently by no means in good condition, in which re- 

 spect they contrast most unfavourably with the magnificent specimens brought 

 in such abundance by Mr. Cuming ; nor is the identification of species always 

 to be relied on. In the Calyptrseidae especially, M. D'Orbigny has added to 

 the confusion which was before characteristic of the nomenclature in that 

 interesting but unfortunate family. Both the specimens and the work, how- 

 ever, are extremely valuable, especially from the materials afforded for a 

 comparison of the faunae of the Atlantic and Pacific coasts ; and the publi- 

 cation of a cheap catalogue of them by Dr. Gray, Oct. 1854, enables ordi- 



* Perhaps the attention now given to the animals of Mollusca, and the reform of systems 

 founded on the shells alone, are due to the labours of Dr. Gray more than to any other man 

 living. It is a source of unfailing regret that the benefit of his works is very much overlooked, 

 in consequence of his not conforming to the principles of nomenclature published under the 

 auspices of the British Association (Reports, 1842, pp. 105-121). 



