AMPHIPODS FROM NORTH AMERICAN WEST COAST — SHOEMAKER 413 



of fifth; sixth jomt longer than fourth; seventh joint nearly }^ length 

 of sixth. 



Pleon segments 1-3 very slightly produced at lower hind corner. 

 Uropods 1 and 2 extending back about same distance, slightly farther 

 than uropod 3. Uropod 1, peduncle slightly longer than rami, 

 spinose on outer and inner margins and bearing rather long stout 

 spine at outer distal corner; rami with rows of spines on upper edges. 

 Uropod 2 shorter than 1, with similar armature but with fewer spines. 

 Uropod 3, peduncle about K length of inner ramus; outer ramus 

 about % length of inner, both rami and peduncle armed on upper 

 edges with few spines. Telson keeled below, narrowly oval, bearing 

 2 minute setae distally, extending back slightly beyond peduncle 

 of uropod 3. None of body segments dentate. Reaches length of 

 about 9 mm. 



Remarks. — Parapleustes pugettensis appears to be subject to 

 considerable variation. It has a wide distribution in the North 

 Pacific. Specimens in the U.S. National Museum come from La JoUa 

 northward along the coast of California to Dillon Beach; Cape Arago, 

 Oregon; Vancouver Island; Queen Charlotte Islands; the Alaskan 

 Peninsula and the west coast of Alaska (62°54' N, 166°38' W). 

 Barnard and Given (1960) provide information on depth and type 

 of bottom preferred by this species in southern California waters. 



Small specimens of 4 or 5 mm. are much less spinose or setose than 

 larger specimens, such as the 9 mm. female from Dillon Beach here 

 figured. Paramphithoe hairdi, described by Boeck in 1872 from the 

 coast of California, is in all probability a synonym of Dana's Iphimedia 

 pugettensis. Boeck does not give the size of his species, but the 

 description and figures contain nothing that can distinguish it from 

 Dana's species. Gurjanova's species (1938), Neopleustes derzhavini, 

 measuring 4 mm., from the Sea of Japan, appears to agree fairly well, 

 so far as her figures show, with Dana's species. A small tooth and 

 seta are shown on her figure (pi. 31, fig. 3) of the first coxal plate, 

 but not on the second; the hind margin of the third pleon segment 

 (pi. 31, fig. 4) is as here shown for Parapleustes pugettensis (fig. lOj). 

 The teeth on the first 3 coxal plates of many specimens from the 

 west coast of America are so small and inconspicuous that they can 

 be easily overlooked. 



Barnard's fine figures (1952) are of a male, while those given here 

 are of a female, showing some of the appendages not illustrated by 

 him. The gnathopods of the 9-mm. female are very much more 

 hirsute than those of the 5-mm. male figured by him. 



