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BULLETIN 51, UNITED STATES NATIONAL MUSEUM. 
List of Diatomaceze from a deep-sea dredging in the Atlantic 
Ocean off Delaware Bay by the U. S. Fish Commission 
steamer Albatross. By Albert Mann. 
pp. 308-812. 
. Description of a new species of cyprinoid fish, Cowestus greent, 
from the headwaters of Fraser River in British Columbia. 
By David 8. Jordan. 
pp. 313-314. 
. Note on the wall-eyed pollack, Pollachius chalcogrammus 
Jucensis, of Puget Sound. By David S$. Jordan and Charles 
H. Gilbert. 
pp. 315-316. 
. Preliminary report on the molluscan species collected by 
the United States scientific expedition to West Africa in 
1889-90. By Robert E. C. Stearns. 
pp. 317-339. 
On rare or little-known mollusks from the west coast of North 
and South America, with descriptions of new species. By 
Robert E. C. Stearns. 
pp. 341-352, 1 plate. 
Scientific results of explorations by the U. 8. Fish Commission 
steamer Albatross. No. XXV. Report on the mollusk- 
fauna of the Galapagos Islands with descriptions of new 
species. By Robert E. C. Stearns. 
pp. 353-450, 2 pls. 
Scientific results of explorations by the U. S. Fish Commission 
steamer Albatross. No. XXVI. Report on the pteropods 
and heteropods collected by the U. S. Fish Commission 
steamer Albatross during the voyage from Norfolk, Virginia, 
to San Francisco, California, 1887-88. By James I. Peck. 
pp. 451-466, 3 pls. 
Diagnosis of a new California lizard. By Leonhard Stej- 
neger. 
p. 467. 
. Description of a supposed new species of Odontophorus from 
southern Mexico. By Robert Ridgway. 
pp. 469-470. 
A subtropical miocene fauna in Arctic Siberia. By William 
H. Dall. 
pp. 471-478, 1 plate. 
Notes on a collection of birds from eastern Nicaragua and the 
Rio Frio, Costa Rica, with a description of a supposed new 
Trogon. By Charles W. Richmond. 
pp. 479-532. 
Description of a new species of fruit bat, Pteropus aldabrensis, 
from Aldabra Island. By Frederick W. True. 
pp. 5383-534. 
