132 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 117 



Since the offshore waters of Alaska have been investigated to a 

 limited extent, quantitative collections made by John Tibbs in the 

 Bering and Chukchi Seas have been particularly rewarding. Smaller 

 collections made by R. Lavenberg from a floating ice island in Chukchi 

 and Beaufort Seas and by the author in Beaufort Sea have been 

 included in this report. 



I am indebted to many people and organizations for their assist- 

 ance during the course of this study (see footnote 1). I wish to ex- 

 press thanks to John Tibbs and R. Lavenberg for making most of 

 these collections. Particular thanks are due the U.S. Coast Guard 

 for permitting me to spend five days aboard the icebreaker U.S.S. 

 Northwind in August 1953 to make bottom collections. I wish also 

 to thank Dr. John L. Mohr, who introduced me to the Arctic biology 

 and who made it possible to complete this study. 



Materials and methods. — Collections from the Bering and 

 Chukchi Seas (Stations 5-60) were made by John Tibbs, University of 

 Southern California;, from R/V Hugh M. Smith in the summer of 1960 

 (see table 1 and fig. 1). The majority of the samples were taken 

 with a Dietz-Lafond snapper, but some samples were taken with a 

 small Hayward orange-peel bucket and by aqualung diving. The 

 collections for Stations A-F and G-1 to G-6 were made by 

 R. Lavenberg, University of Southern California, in the spring of 

 1960 from the ice island Bravo utilizing a small orange-peel bucket 

 (Stations G-1 to G-6) and a biological dredge (Stations A-F). Col- 

 lections from the Beaufort Sea (Stations R-1 to R-4) were made by 

 me in August 1953 from the U.S. Coast Guard icebreaker Northwind. 

 Samples were taken with either a Dietz-Lafond snapper or a small 

 Hayward orange-peel bucket. 



The method of preservation varied according to conditions and the 

 preservative available. Mr. Tibbs washed samples through fine 

 screens to retain, as much as possible, the smaller organisms. Sedi- 

 ment analysis was done by the personnel at the U.S. Naval Electronic 

 Laboratory in San Diego. Sediment terminology follows the size 

 classification of Udden-Wentworth (Barnes, 1959). 



All material on which this study is based, including holotypes and 

 paratypes, has been deposited in the U.S. National Museum. 



Figure 1, — Station locations: stations 5-60 collected by John Tibbs from R/V Hugh M. 

 Smith, July, August 1960; stations A-F dredged by R. Lavenberg from ice island drift 

 station Bravo, April, May 1960; station G, 6 bottom samples taken by R. Lavenberg 

 from drift station Bravo, May-August 1960; station R, 4 bottom samples taken by author 

 from U.S. Coast Guard icebreaker Northwind August 1953. 



