A REVIEW OF THE MYSIDACEA 



211 



62°54' N., longitude 166 °38' W., 4 males, 1 female; Bering Island, 

 L. Stejneger collector, 1 adult breeding female, 19 mm. ; Kiska Harbor, 

 Aleutian Islands, 9-12 fathoms, sandy mud, collected by W. H. Dall, 3 

 females ; Albatross station 3600, 2 males. 



Figure 87. — Acanthomysis costata (Holmes): a, Third thoracic limb, X 100; b, uropod, 



X 100; c, telson, X 100. 



Distribution. — Known previously only from Kamchatka (Der- 

 shavin, 1913). The present material is from Alaska, Bering Island, 

 and the Aleutian Islands, and the species is probably not uncommon 

 in shallow water north of latitude 50° on both sides of the Pacific. 



Remarks. — This species may be distinguished by the following 

 characters : ( 1 ) The last thoracic somite and all the abdominal somites 



