FAUNA OF THE ALEUTIAN ISLANDS AND ALASKA PENINSULA 375 



Figure 5. — Green sea urchin, Strongylocentrotus drobachiensis, ventral or 



oral view. Rat Island, June 30, 1937. 



SEA CUCUMBERS 



The sea cucumber, Cucumaria populifer, was collected at Kiska 

 Island and was observed at other places in the archipelago. 



CRUSTACEANS 



COPEPODS 



Eighteen species of copepods were identified in marine-plankton 

 collections. Concerning Acartia pacifica. Dr. Wilson states (in 

 correspondence), that — 



This species was established by Steuer in 1915 with figures of the fifth legs 

 of the two sexes and a statement of the size but with no description. These 

 are the first to be reported since that date and the species is much in need of 

 a detailed description. 



The predominant species, judging from the number of collec- 

 tions in which it appears, is Eucalanus clongatus. 



Several parasitic copepods were collected, Lepeophtheirus 



