tenuis), adult hermit crabs {Pagurus sp.), and brittle 

 stars (Ophiuroidae) in addition to more usual plank- 

 tonic species (Table 1, Appendix Table 2). 



SUMMARY 



One hundred three species of invertebrates were taken 

 in Isaacs-Kidd midwater trawl samples from the 

 southeastern Chukchi Sea during WEBSEC-70. Thirty- 

 three species were taken by otter trawl. Numbers of in- 

 vertebrate species in a midwater trawl sample varied 

 from 4 to 40 (mean, 17). Amphipods were the most varied 

 group (40 species) and shrimps the next most varied 

 group ( 14 species). 



After removal of hydroid and scyphozoan jellyfishes, 

 euphausiids and mysids contributed the most to the 

 biomass and numbers of the midwater invertebrates 

 retained by the midwater trawl. 



ACKNOWLEDGMENTS 



We thank Alexander Hoke for the design and 

 execution of the computer program for Appendix Table 

 2. We thank the U.S. Coast Guard Oceanographic Unit 

 and the Marine Sciences section of the Icebreaker 

 Glacier for assistance in collection of samples from the 

 Chukchi Sea at a time of the year not previously sam- 

 pled. 



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