i 
ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 525 
The species quoted in the text from Guérin, which appear in the Mag. 
Zool. for 1844, also appear here with the early date. Oliva polpaster, a south- 
ern form, from Guayaquil, &c., is distinct from all varieties of the Gulf species, 
O. Cumingiz; it bears date 1839. In the same vol. are described and figured— 
Plate. 
2. Calyptrea (Calypeopsis) rugosa, Less. Payta, Peru. [= Crue. imbriecatum, 
without pits. | 
23. Conus hieroglyphus, Ducl. Probably Cal. [A Pacific form, like C. abbre- 
viatus, 
27. Cyprea ba iit Ducl. Cal. [Astarved var. of Aricia arabica, Pacific Is. ] 
38. Lady Douglas (afterwards known as Lady Wigram).—Placunanomia 
cepio. {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—tThe 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 resulted in 
information that it was “in Dr. Wyman’s Mus. Nat. Hist., in the granite 
building on Howard Street ;” but no opportunity has been afforded of col- 
lating 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 eliminating 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 unique 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 drawers 
adjoining the Reigen collection, the Vancouver collection, and the Stimp- 
sonian typical collection of East Coast N. American shells. The following 
is a résumé of corrections obtained from these different sources, numbered to 
correspond with the list, Rep. pp. 194-201 :— 
2. “ Parapholas”’ penita [is a Pholadidea]. 
3. Platyodon cancellatus | = Cryptodonta myoides, Nutt. MS.}. 
4. Cryptodon Nuttallii, Conr. {The author, finding the generic name preoccupied, 
changed it to Schizotherus N.: 1852, teste Bin. Bibl.; 1854, Journ. A. N.S, 
_ Phil. p. 199,=Lutraria capar, Gld,=L, maxima, Midd.,= Tresus maximus, 
