356 



BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



Distribution. — Gulf Stream south of Marthas Vineyard (Wheeler) ; 

 Malay Archipelago (Cleve) ; Messina, Nizza (Claus) ; French coast 

 (Gourret) ; South Atlantic, Mediterranean (Giesbrecht) ; North 

 Atlantic (Cleve) ; Ked Sea, Indian Ocean (Thompson and Scott) ; 

 Adriatic (Steuer, Pesta) ; Chesapeake Bay (Wilson). 



Color. — Body rather opaque, with a variable extent of red, yellow- 

 ish-red, and yellow pigment, especially in the region of the mouth, in 

 the winglike extensions of the posterior metasome segments, and 

 in the genital segment; eye dark red; eggs yellowish, turning red 

 with development. 



Feirmie. — Head separated from first segment; third and fourth 

 segments fused dorsally, the lappets on the third segment not reach- 

 ing the genital openings ; gen- 

 ital segment and abdomen 

 fused, spindle-shaped, widest 

 through the genital openings, 

 strongly tapered at both 

 ends ; caudal rami about half 

 as long as urosome, and 

 nearly parallel. Distal exo- 

 pod segment of first three 

 pairs of legs with three outer 

 sjjines ; endopod of fourth leg 

 a small knob with one apical 

 seta. Total length, 1.45-1.65 

 mm. 



Male. — Head more or less 

 fused with first segment ; gen- 

 ital segment and abdomen 

 separated ; posterior half of genital segment not tapered but forming 

 prominent rounded corners, each with a stout plumose seta on its 

 ventral surface ; caudal rami half as long as ucosome. The tooth on 

 the inner margin of the second segment of the posterior antenna of 

 the female replaced in the male by minute spinules. Total length, 

 1.3-1.4 mm. 



Remarks. — Judged from the distribution given above, this is 

 somewhat of a tropical species, and it probably comes into the 

 present area by way of the Gulf Stream, in which it was found 

 by Wheeler. 



CORYCAEUS OBTUSUS Dana 



Figure 215 



Corycaeus ohtusus Dana, Proc. Amer. Acad. Arts and Sci., vol. 2, p. 39, 1849. — 

 Giesbrecht, Fauna und Flora des Golfes von Neapel, vol. 19, p. 659, pis. 4, 

 51, 1892. 



Occurrence. — Both sexes were obtained in a surface tow at Station 

 2194, Albatross^ south of Nantucket. 



Figure 214. — Corycaeus elongatus: a. Female, 

 dorsal ; i, female, lateral ; c, female, fourth 

 leg. (From W. M. Wheeler) 



