PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxv. 



plumose setae on expanded lower side of penultimate joint of peduncle; 

 flagellum shorter than peduncle. 



First gnathopods with about nineteen plumose seta? on lower mar- 

 gin of side plate; hand with an oblique palm, which is shorter than 

 the posterior margin and defined above by a triangular tooth with 

 a strong spine at its base. Second gnathopods much like the first; 

 side plate with about fourteen plumose seta?. Fourth peraeopod over 

 half the length of the body, the basal joint with a prominent rounded 

 lobe on upper half and bearing plumose setae on posterior as well as 

 anterior margin. Fifth peraeopod with the posterior lobe of the 

 basal joint strongly produced downward and rounded, and furnished 

 with serrations with plumose seta? in the angles between them; the 

 serrations increase in size around the postero-lateral angle where 

 many of them become double pointed. 



Third abdominal segment with plumose seta? on lower margin, the 

 posterior angle produced into a long, strongly upturned tooth. Third 

 uropod with the outer ramus fully twice the length of the peduncle, 

 the outer margin armed with six spines, the inner with two; terminal 

 joint minute, about as broad as long and bearing two long spines. 

 Inner ramus slightly over half the length of outer, with two terminal 

 spines and one on inner margin. Telson about as broad as long, the 

 lobes rounded. 



Length. — 9 mm. 



Locality. — A single female specimen from Station 4554, Monterey 

 Bay, 60-80 fathoms. 



Type.— Cat. No. 38549, U.S.N.M. 



This species is closely allied to Harpinia plumosa (Kr0yer), but 

 it differs from it in having a much larger number of setae on the 

 lower margins of the side plates; in having rather more slender gnath- 

 opods ; in having the posterior margin of the basal joint of the penulti- 

 mate peraeopods furnished with plumose seta? and a prominent lobe; 

 in having several well marked and regularly arranged teeth or serra- 

 tions on the posterior margin of the basal joint of the last peraeopods, 

 in having the second joint of the outer branch of the terminal uropods 

 minute, and in having the outer margin armed with a greater number 

 of spines. From //. neglecta it differs in having much less prominent 

 lateral angles of the head and in having a more strongly upturned 

 tooth on the third abdominal segment. 



Family METOPIDiE. 



METOPA PACIFICA, new species. 



Male. — First antennae almost as large as the second, which nearly 



equals the length of the body; flagellum shorter than the peduncle, 



hich extends slightly beyond the penultimate joint of the peduncle 



ud antennae. Peduncle of second antenna? very elongate, 



