AMPHIPODS FROM NORTH AMERICAN WEST COAST — SHOEMAKER 427 



rami and armed on upper outer margin with 5 spines, 2 of which are 

 apical; upper inner margin with 3 spines, 1 of which is apical; outer 

 ramus slightly longer than inner ramus, each armed with spines 

 (fig. 5b). Uropod 2, peduncle longer than rami, upper outer margin 

 with 3-4 spines, one of which apical, inner margin with 2 spines, one 

 of which is apical ; outer ramus slightly the shorter, each armed with 

 spines (fig. 56). Uropod 3 extending back farther than 1; peduncle 

 about ji as long as outer ramus, which bears groups of spines con- 

 taining few plumose setae on outer and inner margin, second joint 

 small, narrow; inner ramus about K as long as outer, and bearing few 

 spines on inner margin and group of spines and plumose setae apically. 

 Telson reaching slightly beyond end of peduncle of uropod 3, cleft 

 about Yz its length, armed with spine and plumose seta on either 

 lateral margin, 2 spines and few spinules on apex of each lobe. GUIs 

 of gnathopod 2 and pereopods 1-3 each with 2 finger-like appendages. 

 Gill of pereopod 4 with 3 finger-like appendages, gill of pereopod 5 

 with 1 appendage. 



Stimpson gave .4 to .5 of an inch (about 13 mm.) as the length of 

 this species, but there are specimens in the U.S. National Museum 

 measuring up to 21 mm. that were taken from a brackish pond in 

 Snohomish County, Washington, a pond which receives an inflow from 

 Puget Sound at exceptionally high tides. Apparently Stimpson's 

 description was taken from rather small specimens. 



Female. — Much like male but smaller. Antennae somewhat 

 shorter, flagellum of antenna 2 bears calceoli which are smaller than 

 those of male. Gnathopod 1 stronger but shorter than gnathopod 2 

 and like that of male. Sixth joint of gnathopod 2 comparatively 

 narrow, with palm slightly oblique or nearly transverse. Uropods 

 shorter than those of male. 



Remarks. — Anisogammarus confervicolus appears to inhabit bays, 

 estuaries, brackish tidepools, and mouths of streams where the water 

 is brackish. In the U.S. National Museum there are specimens from 

 Santa Catalina Island, San Diego, and various localities northward 

 along the coasts of California, Oregon, and Washington. The species 

 appears to be conmion in Puget Sound and has been taken at Van- 

 couver Island. There are 3 collections from Alaska: 1 from Saginaw 

 Bay, Kuiu Island, Frederick Sound, Alexander Archipelago; 1 from 

 a stream entering Orzenoi Bay, southwest Alaska (stream probably 

 bracldsh, at least at high tide) ; and 1 from Sitka. Barnard (1954) 

 gives several localities in Oregon and 1 in Alaska (Alinchak Bay), 

 and Bousfield (1958) records the species from a number of Canadian 

 Pacific localities. 



