58 Bulletin American Museum of Natural History [Vol. LII 



Amphithyrus orientalis Stebbing 

 Am-phithyrus orientalis Stebbing, 1888, 'Challenger Amphipoda,' p. 1485. 

 San Josef Island, Gulf of California; 2 specimens. 

 These specimens agree quite closely with Stebbing's description of 

 this species in the ' Challenger Amphipoda.' He says, however, that the 

 telson forms in outline an inverted arch with apex acute, but in the pres- 

 ent specimens the apex is narrowly rounded as I have shown in the figure. 



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