ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 579 
d. The Pacific Railroad Survey, under Lieutenant R. 8. Williamson, 1853. 
Collector, Dr. A. L. Heermann. 
e. The Pacific Railroad Survey, under Lieutenant R. 8. Williamson, 1855. 
Collector, Dr. J. 8S. Newberry. 
f. United States and Mexican Boundary Survey, under Major W. H. Emory, 
1852. Collector, Arthur Schott. 
g- Colorado Expedition, under Lieutenant J. C. Ives. Collector, Dr. J. 8. 
Newberry. 
h. The United States North-West Boundary Survey, under Com. A. Camp- 
bell. Collectors, Dr. Kennerley and Mr. George Gibbs. 
Besides the above official explorations on the American side, during a 
period in which the British Government only fitted out a single expedition 
coordinate with h, the Smiths. Inst. has received a large number of pri- 
vate collections from their correspondents, of which the following are the 
principal :— 
2. Mr. Jas. G. Swan, from Port Townsend, Cape Flattery, Neeah Bay, and the 
neighbouring shores of Vancouver; at intervals, during many years. 
j. Dr.J.G. Cooper, early private collections from Shoalwater Bay and various 
stations in California and from Panama; and lately the dredged collections 
of the California State Geological Survey, of which a portion were sent 
in adyance by Dr. Palmer. 
k. California Academy of Natural Sciences, duplicates of their collection, 
with the privilege of inspecting unique specimens. 
l. Dr. E. Vollum, U.S.A., from Fort Umpqua. 
m. Lieutenant W. P. Trowbridge, from coast of Oregon and California. 
n. Dr. J. A. Veatch, from the peninsula of Lower California, and especially 
from Cerros Island. 
o. Mr. A. 8. Taylor, from Monterey. 
p. Mr. Andrew Cassidy, from 8. Diego. 
q. Rev. J. Rowell, now of San Francisco, from various stations in both faunas, 
and especially from Sta. Crux, and the Farallones Is. 
rv. Mr. John Xantus, of the U.S. Coast Survey, from Cape St. Lucas. Speci- 
mens were received through him from Socorro Island (one of the Revilla- 
gigedo group), Tres Marias and Margarita Island. 
s, Captain C. P, Stone, from Guaymas and the northern part of the Gulf of 
California. 
#, Captain C. M. Dow, from the coast of Central America. 
uw. Dr. J. H. Sternberg, from Panama. 
v. Dr. J. H. Frick, Mr. James Hepburn, and others, from San Francisco. 
w. Mr. C. N. Riotte, U. S. Minister to Costa Rica, from Puntas Arenas. 
x. Mr. W. H. Pease, of Honolulu, collections made by his agents at various 
stations on the coast, particularly at Margarita Bay. 
Collections haye also been received from various expeditions already tabu- 
lated in the first Report; and from stray quarters not here included because 
their accuracy may admit of doubt. The species received from the most im- 
portant of these sources will be enumerated in their order; of the remainder, 
exact lists may be consulted by the student in the Smithsonian Catalogues, 
and the combined results will be found tabulated as ‘ Pacific Railroad Expe- 
ditions’ or ‘Smithsonian Collections.’ 
[B] Smithsonian Publications—These may be classed under three heads. 
(1.) Works published by the U. 8. Government, with more or less of assist- 
ance derived from and through the Smiths. Inst. (2.) The ‘Smithsonian 
Contributions to Knowledge,’ printed in 4to, and answering to the ‘ Trans- 
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