286 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



the center of the distal segment, with three apical and two inner 

 setae, the latter widely separated, and the five covered with knobs 

 like those of the distal segment. Total length, 1.75-2 mm. 



Male. — First antennae enlarged and prehensile, but not reaching 

 the posterior margin of the cephalic segment. Endopod of the sec- 

 ond as well as the first legs 2-segmented, its distal segment nearly 

 three times as long as the proximal segment, with three apical and 

 one inner setae. Fifth legs smaller than those of the female; distal 

 segment twice as long as wide, with three apical setae and three on 

 the outer margin. Basal expansion just reaching the center of the 

 distal segment and narrowed at the tip, with two apical setae and 

 one on the inner margin near the base. Total length, 1.4-1.6 mm. 



Remarks. — This species can be recognized by the cuticular lenses 

 on the front of the head combined with the very short caudal setae. 

 It is evidently a pelagic harpactid and one that frequents the surface, 

 and enters the present area only from the south. 



Family CYLINDROPSYLLIDAE 



Genus STENOCARIS G. O. Sars, 1909 



Body slender and nearly uniform in width, 10 times as long as 

 wide; head fused with the first segment; urosome as long as the 

 metasome. 4-segmented in the female, 5-segmented in the male ; gen- 

 ital segment partly divided in female, wholly divided in male ; caudal 

 rami divergent; two short, cylindrical ovisacs, eggs large in a single 

 row. First antennae 6- or 7-segmented, the second segment much 

 elongated; exopod of second antenna 1-segmented; exopods of first 

 four pairs of legs 3-segmented, endopods of first and fourth legs 

 2-segmented, of second and third pairs 1-segmented in female, 2-seg- 

 mented and modified in male; fifth leg a 1-segmented lamella without 

 distinction of parts. 



KEY TO THE SPECIES (BOTH SEXES) 



1. Caudal rami three times as long as wide, the apical seta trans- 

 formed into a lancet-shaped spine, bearing an outer bristle at 



its base minor (p. 286) 



Caudal rami as wide as long, each with 3 apical setae, which are 

 unmodified arenicola, new species (p. 287) 



STENOCAKIS MINOR (T. Scott) 



FiGUBE 177 



Cylindropsyllus minor T. Scott, 10th Ann. Rep. Fishery Board Scotland, pt. 3, 



p. 260, pi. 11, 1892. 

 Stenocaris minor Saks, Crustacea of Norway, vol. 5, p. 434, suppl. pi. 50, 1911. 



Occwrrence. — A few females were taken in the French Watering 

 Place on Naushon Island, August, 1925. 



Distribution. — Scottish coast (T. Scott) ; Norwegian coast (Sars). 



\ 



