BRYOZOA OF THE PACIFIC COAST OF AMERICA 

 Part 1, Cheilostomata — Anasca 



By Raymond C. Osburn, Ph.D., D.Sc. 



A report based chiefly on the Bryozoa collected by the Allan Han- 

 cock Expeditions, 1933-1942, in the Velero III. 



The ten cruises of the Velero III and shore collections extended from 

 the coast of Oregon to San Juan Bay, Peru, and included the oceanic 

 islands off the coast, Socorro, Clarion, Cocos and the Galapagos. Five 

 visits were made to the Galapagos area, otherwise the most intensive 

 collecting was done about the islands off southern California, southward 

 along the coast of Lower California and in the Gulf of California, a 

 total of more than 1500 dredge-stations and 2000 additional bottom 

 samples. 



Various other institutions have contributed Pacific coast specimens 

 toward the completion of this work, usually local material. The United 

 States National Museum has loaned the Bryozoa from a number of the 

 "Albatross" stations and from the Alaska Crab Investigation. The 

 American Museum of Natural History contributed a small amount of 

 material from the "Albatross" expedition of 1911 along the coast of 

 Lower California. The California Academy of Science gave free access 

 to the Bryozoa collection, made chiefly by Dr. Alice Robertson. The 

 Hopkins Marine Station at Pacific Grove, California, presented me with 

 a large collection, mostly from that area, made by Miss Elizabeth A. 

 Blagg. The Pacific Biological Station at Nanaimo, British Columbia; 

 the Oceanographic Laboratory at Friday Harbor, Washington; the 

 Pacific Marine Station at Dillon Beach, California; the Kerckhoff Ma- 

 rine Station at Corona del Mar, California ; the Scripps Oceanographic 

 Institution at La Jolla, California, and the Los Angeles County Museum 

 have all aided by the contribution of specimens. Also Dr. Paul L. Galt- 

 soff of the U. S. Fisheries and Wildlife Service has permitted me to study 

 the Bryozoa on a collection of pearl oyster shells {Margaritiphora mazat- 

 lanica) from the Gulf of Panama, about 60 species. A large gap in our 

 knowledge of the high northern species of the Pacific coast has been well 

 filled by the contribution of 80 species from Point Barrow, Alaska, by 



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