AMPHIPODS FROM NORTH AMERICAN WEST COAST — SHOEMAKER 423 



(fig. 13n). Gnathopod 2 (fig. 13o) longer than 1; fifth joint as long 

 and as broad as sixth; sixth joint about % longer than wide, palm 

 transverse, convex, armed thi'oughout with very fine closely set 

 teeth, without defining angle, but armed where it curves into hind 

 margin of joint with 5 slender crenulate spines (fig. 13^) on outside, 

 and 6 stout straight spines (fig. I3q) on inside; seventh joint fitting 

 palm, naU long, slender, bearing forward-pointing tooth at its base. 



Gnathopod 2 and pereopods 1-3 carry marsupial plates which are 

 fringed throughout with long closely set simple setae, only few of 

 which are shown in figure 13o in order not to obscure spines on joints 

 of limb. Length of female about 12.5 mm. 



Types. — Male holotype, USNM 101742, and 15 paratypes, taken by 

 Dr. Waldo L. Schmitt, station 79, on shore of Squaw Harbor, Baralof 

 Bay, Unga Island, Shumagin group, Alaska, Oct. 20, 1940. 



Specimens also taken by Dr. Schmitt offshore, on and under rocks, 

 Sand Point, Popof Island, Alaska, Oct. 25, 1940; and Canoe Bay, 

 Alaska Peninsula, south end near opening of Pavlof Bay, Sept. 



17, 1940. 



Anisogammarus confervicolus (Stirnpson) 



Figures 14, 15 



Mara confervicola Stirnpson, 1856, p. 90. 



Gammarus confervicolus. — Stirnpson, 1857, pp. 520-521. — Bate, 1862, p. 218, pi. 



38, fig. 9.— Holmes, 1904, p. 239. 

 Melita confervicola. — Stebbing, 1906, p. 428. 

 Anisogammarus (Eogammarus) confervicolus. — J. L. Barnard, 1954, pp. 9-12, 



pis. 9-10.— Bousfield, 1958, p. 86, fig. 10. 



Male. — Head, lateral lobe obliquely truncate with front margin 

 slightly concave; eye reniform, black, of medium size. Antennae 

 about K length of body. Antenna 1 slightly longer than antenna 2 ; 

 first joint slightly longer than second and bearing 1-2 rather stout 

 spines on lower margin; third joint about ji length of second; flagellum 

 much longer than peduncle and composed of 26-30 joints; accessory 

 flagellum composed of 5-6 joints and minute terminal joint. Antenna 

 2, second joint with well-developed gland cone; fourth and fifth joints 

 equal in length; flagellum about equal in length to fifth peduncular 

 joint and composed of 11-15 joints, first 7-8 of which bear calceoli 

 on upper distal corners. 



Mandible, molar prominent with triturating surface bearing plu- 

 mose seta; cutting-edge toothed, accessory plate present; spine-row 

 of about 6-7 spines and several plumose setae; palp well developed 

 with third joint slightly shorter than second. Maxilla 1, inner plate 

 large with many plumose setae on lateral margin and few on distal 

 end; outer plate bearing 11 spine-teeth; palp large, second joint armed 

 on oblique distal margin with 6 spine-teeth and several submarginal 



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