AMI'HIPODA OK SOI'THERN NEW ENGLAND. 



473 



Anonyx nugax. After Sara. ep 3) 

 third abdominal segment, 

 gnathopods enlarged. 



Side of 

 Second 



pair not half the length of primary our: lirst gnathopods rather stout, hand long, subrectangular 

 palm transverse; hand of second gnathopods oblong-oval, about half as long as carpus, densely setose 

 the minute dactyl articulated near middle of distal 'margin; last 

 two pairs of pereopods nearly equal in length and considerably 

 longer than third; postero-lateral angles of third abdominal seg- 

 "inent ending in a triangular acute projection, above which is a 

 deep sinus; fourth abdominal segment with only a slight dorsal 

 depression; terminal uropods with lanceolate rami furnished 

 with marginal spines and setose on inner edges; inner ramus but 

 little longer than basal portion of outer; telson oblong, cleft 

 nearly to base, a small spinule at the tip of each lobe. 



Arctic specimens may attain a length of -10 nun. (Sars). The 

 New England representatives of this species are not often half 

 that length. 



Extensively distributed throughout the Arctic Ocean; found 

 in the North Atlantic, Norway, Iceland, Greenland, Behring 



Sea, Labrador. Common off the coast of New England and often found in great abundance near 

 Woods Hole. 



Tryphosa pinguis (Boeck). 



ATionyx pinguis Boeck, Bemarken Norske A.mphip., |>. 662, I860. 

 Orchomt m neUa pinguis Sars, ('rust. Norway, p. (17, pi. 24, ti^ r . 2, 1891. 



A plump, firm, and compact species. Eyes elongated; antero-lateral corners of head produced 



and narrowly rounded; lirst antenna' short, first joint of tlagellum elongated; second antenna? much 



longer than lirst, especially in the male; coxa! plates very large, 

 lirst four pairs more than twice as deep as their segments; fifth 

 pair much deeper than wide, posterior part of lower margin pro- 

 duced into a rounded lobe; carpus of first gnathopods with a nar- 

 row posterior lobe; hand oblong, distally tapering; palm nearly 

 transverse; hand of second gnathopods oblong, postero-distal angle 

 produced; posterior peraeopods short, basal joints broadly suboval; 

 postero-lateral angles of third abdominal segment rounded, the 

 margin above the angle minutely crenulated or nearly smooth; 

 fourth abdominal segment with a rather deep dorsal depression 

 near anterior end; terminal uropods with inner ramus not exceed- 

 ing basal portion of outer one; telson distally tapering and cleft to 

 beyond the middle. 

 Color, whitish. 

 Length, about 7 mm. 



Arctic regions; Norway; Greenland; Labrador; New England. 

 Often taken in abundance near Woods Hole. It is not rarely 



found in company with Anonyx nugax. 



This species is closely allied to T. minuia, but differs from it in having narrower eyes, stouter first 



gnathopods with a much narrower posterior carpal lobe, and in the crenulated posterior margins of 



the third abdominal segment. The forms from New England previously referred to Orckomene minuia 



doubtless belong to this species. 



Tryphosa pinguis. Vineyard Sound. 



Hippomedon serratus Holmes, new species. 



Female: Eyes oblong, rather narrow; lateral lobes of head triangular, subacute; first basal joint 

 of first antenna- produced distally into a lobe which reaches as far as tip of third joint; second joint 

 distally produced into a much shorter lobe; first joint of tlagellum as long as the eight remaining 

 joints; lower margin fringed with long hairs; secondary tlagellum three-jointed; second antennfe 

 scarcely half the length of body, penultimate joint of peduncle about two-thirds length of terminal 

 one; tlagellum about twice the length of peduncle; first four coxal plates fully twice as deep as their 

 segments, the first distally expanded, concealing the mouth parts; second and third coxal plates about 



