ON MOLLt'SCA OP THH WEST COAST OF NORTH AMERICA. 0~0 



The species quoted in the text from Guerin, which appear in the Mag. 

 Zool. for 1S44, also appear here with the early date. Oliva polpnster, a sonth- 

 era form, from Guayaquil, ifec, is distinct from all varieties of the Gulf species, 

 0. Cumingii; it hears date 1839. In the same vol. are described and figured — • 



Plate. 



2. Calyptrma {Calypeiypsis) rugosa, Less. Payta, Peru. [ = Cruc. imbricatum, 

 without pits.] 

 23. Conus hieroglyphus, Duel. Probably CaL [A Pacific form, like C. ahbre- 



ciatus,'] 

 27. Cypresa eglaiitina, Duel. Cal. [A starved var. of Aricia arahica, Pacific Is.] 



38. Lady Douglas (afterwards known as Lady Wigram). — Placunanomia 

 eepio. [The type is an old shell, with faint ribs.] 



Placunanomia alope. [The type is a young shell, with small scars and 

 faint ribs. The large series of specimens examined in the Smithsonian col- 

 lections proves that these forms are among the many varieties of P. macro- 

 schisma. The Indians have a superstitious dread of handling it. Many more 

 species have since been detected in the Brit. Mus., from the late Lady 

 Wigram's valuable donations, including Macoma inquinata, Desh., described 

 from her specimens ; but, as they are evidently from mixed localities, it has 

 not been thought necessary to catalogue them.] 



39. Nuttall. — The verification of Conrad's species being of considerable 

 importance, I made diligent search for the original types during a recent 

 tour in the United States. The supposed collection at Harvard University, 

 Cambridge, Mass., has not been discovered by Professor Agassiz. The 

 inquiries which Professor Longfellow kindly made at my request residted in 

 information that it was " in Dr. Wyman's Mus. Nat. Hist., in the granite 

 buiiding on Howard Street ; " but no opportunity has been afforded of col- 

 laiing it, or even of verifying its existence. Dr. Jay rendered me every 

 assistance in studying the types which he has catalogued in his collection, 

 now rearranging in his residence at Memironeck, near New York, and gave 

 such duplicates as could be spared for the Smithsonian Museum. Several 

 species, however, were not to be found, and some were clearly erroneous, as 

 e. g. Chama " exogyra, Conr.," which proved to be C. lobata, Brod. ; "W. I., 

 teste Cuming ; China, Brit. Mus. The most satisfactory information was 

 derived from an interview with Mr. Conrad himself at the Acad. Nat. Sci., 

 Philadelphia, where the honorary curator, Mr. W. G. Binney, afforded us 

 all possible aid in ehminating types from the collections of the Academy and 

 of private conchologists in the city. Mr. Nuttall's death (the news of which 

 was received soon after) prevented his revising the corrections thus obtained. 

 .As he had previously presented a duplicate series of his shells to the Brit. 

 Mus., which had been incorporated with the general collection, and had sig- 

 nified to me his intention to leave the imique specimens to the nation, I at 

 once communicated with the survivors and with Dr. Gray, who was fortunate 

 enough to stop the intended sale, and to secure the shells, which were kindly 

 presented by the executors. They are now mounted, and kept in drawejs 

 adjoining the Eeigen collection, the Vancouver collection, and the Stimp- 

 sonian typical collection of East Coast N. American shells. The following 

 is a resume of corrections obtained from these different sources, numbered to 

 correspond with the list, Eep. pp. 194-201 : — 



2. " Parapholas " penita [is a Pholadided]. 



3. Platyodon cancellatus[= Cryptodonta mymdes, Nutt. MS.]. 



4. Cryptodon NuttaKi, Oonr. [The author, finding the generic name preoccupied 



changed it to ScMzotheerm N. : 1852, teste Bin. Bihl. ; 1854, .Tourn. A. N. fc^ 

 PhU. p. \QQ.=lMtraria capax, Gld.=i. maxima, Midd.,= ZVe«*s manmtis, 



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