1908] Bradley. — Amphipods of the Genus Corophium. 239 



side, its apex two-thirds wider than the base of its ramus; the 

 latter ovate, slightly constricted at base, not quite two-thirds as 

 broad as long, its margin fringed with long setae. 



Color in alcoholic specimens, white or purplish beneath, and 

 a deeper pui-ple above, darker toward the apex of the dorsal seg- 

 ments and on the head. When exposed to strong light the color 

 rapidly disappeared, so that I dare say the specimens in life were 

 much more deeply colored. 



Length, adult male, 15 mm. ; adult female, 8 mm. 



Type locality.- — Stomach of salmon from Puget Sound. 



The records of the occurrence of the specimens of C. salmonis 

 in the collections are as follows: 



Karluk Beach, July 23, 1903. Stomach of sockeyes, Onco- 

 rJryvcJius nerha, 104-141 mm. long; ten specimens. 



Karluk Beach, June 8. 1903. Stomach of young sockeye, 

 OiicorJiyiicJius ncrl-a, two specimens. 



Karluk Beach, June 8, 1903. Stomach of cohos, Oncorhyn- 

 eluis lisutcli, eight specimens. 



Karluk Estuary, July 24, 1903. Stomach of king salmon 

 {Oncorhyriclnis tscJiau'))tsclia) fingerlings, 132 mm.; about 100 

 specimens. 



Karluk Estuary, July 24, 1903. Stomach of coho {Oiico- 

 rliynchus kisutch) fingerlings, 71-79 mm.; 150-200 specimens. 



Karluk Estuary, July 24, 1903. Stomachs of nine sockeye 

 {Oncorhynclius ncrka) fingerlings, 102-145 mm.; 200 or 300 

 specimens. 



The specimens of C. salmonis were collected in Alaska by the 

 United States Bureau of Fisheries and the data here given con- 

 cerning this species are published by permission of Hon. Geo. i\I. 

 Bowers, Commissioner, U. S. Bureau of Fisheries. 



Comparison of the Species. 



Coloration. — C. spinicorne (pi. 13, figs. 36, 37) is distinctly 

 stouter; its ground color is yellow, the antennae and face above 

 are marked with brown, and there is a brown band on the base 

 of each dorsal segment. C. salmonis (pi. 13, figs. 38, 39) is more 

 slender, the second antennae of the grown males immensely de- 

 veloped, the color white or purplish beneath, and a deeper purple 



