BY S. J. HOLMES 



THE Amphipod crustaceans collected by the Harriman Alaska 

 Expedition number twenty-two species. Six of these are here 

 described for the first time. I am indebted to Prof. W. E. Rit- 

 ter, Prof. Trevor Kincaid, and Dr. W. R. Coe for the specimens 

 upon which this report is based. 



Tribe Hyperiidea. 



PARATHEMISTO OBLIVIA (Kroyer). 

 Three specimens collected at Humboldt Bay, Popof Island, Alaska. 



Tribe Gammaridea. 



Family ORCHESTIID^E. 



ALLORCHESTES OCHOTENSIS Brandt. 



Eyes rather small, irregularly oval to broadly reniform. First antennae 

 nearly as long as the second, the second joint nearly as long as the first ; 

 third about three fifths as long as the second ; flagellum about as long as 

 the peduncle and composed of 15-20 short segments. Second antennas 

 a third the length of the body, the last two joints of the peduncle of sub- 

 equal length ; flagellum as long as the peduncle. Fourth joint of the 

 palp of the maxillipeds narrow, curved, but scarcely unguiform. First 

 gnathopods almost alike in the two sexes, the hand slightly narrower 

 across the middle in the female. Second gnathopods in the male with 

 the basal joint stout, much widened below, and concave anteriorly; 

 carpus small and produced posteriorly into a narrow lobe which is com- 

 monly concealed between the merus and propodus ; hand large, oblong, 



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