354 BULLETIN 15 8, UlSTITED STATES NATIONAL MUSEUM 



surface tow on Georges Bank, September, 1874; both sexes in verti- 

 cal haul at Station 20044, Grampus^ February, 1920; both sexes in 

 surface tow at Stations 2171 and 2194, Albatross; a single female in 

 a surface tow in Menemsha Bight, Marthas Vineyard, August, 1926. 



Distribution. — Palermo (Philippi) ; South Atlantic (Lubbock) ; 

 Nizza (Claus) ; New Guinea, Philippine Islands, North Atlantic 

 (Brady) ; Canary Islands, Malta (Thompson) ; North Atlantic 

 (Cleve) ; South Africa (Cleve) ; Indian Ocean (Thompson and 

 Scott) ; Sulu Sea (Dana) ; Adriatic (Pesta) ; Gulf Stream south of 

 Marthas Vineyard (Wheeler); Chesapeake Bay (Wilson). 



Color. — Body rather opaque, tinged with carmine-red, deepest in 

 the cephalic and genital segments; chitin of the head and append- 

 ages violet ; eggs blue, increasing in color with development. 



Female. — Metasome obovate, the greatest width far in front of 

 the center; urosome half the length of the metasome; genital seg- 

 ment but little longer than the abdomen ; caudal rami as long as the 

 last two abdominal segments combined, four times as long as wide. 

 Outer exopod spines of first and second legs, 1, 1, 3, of third and 

 fourth legs 1, 1, 2, each spine with a wide marginal membrane which 

 is coarsely toothed. Fifth legs minute, as wide as long, the apical 

 setae subequal. Total length, 1.1-1.27 mm. 



Male. — Metasome narrower, but the greatest width still far for- 

 ward; genital segment much enlarged, more than three times the 

 length of the abdomen, the posterior lappets with small lateral points 

 turned outward. First three abdominal segments very short and 

 together hardly longer than the anal segment ; caudal rami as long as 

 the last three segments combined, converging distally ; fifth leg minute 

 and conical, its apical setae subequal. Total length, 0.8-0.95 mm. 



Remarks. — This is the most abundant species of the genus in the 

 area; it is pelagic in its habits and seems to prefer the surface. 

 When alive it may be recognized by irregular spots of the carmine- 

 red in the metasome, and by the blue eggs. 



Family CORYCAEIDAE 

 Genus CORYCAEUS Dana, 1845 



Body slender, subclavate, the metasome but little dilated; cepha- 

 lic segment much longer that the rest of the metasome, carrying on 

 the forehead two large corneal lenses, placed close together. Third 

 metasome segment produced backward at each posterior corner in an 

 acutely pointed lappet; fourth segment narrower than the third, 

 sometimes fused with it dorsally, but with separate lappets. Uro- 

 some 2-segmented, tlie two sometimes fused into one; caudal rami 

 narrow and elongate. First antennae 6-segmented; second anten- 



