74 



BULLETIN" 15 8, tTKlTEt) STATES NATIONAL MtTSEtJM 



Remarks. — This male obtained by Rathbiin is probably a little 

 larger than the one described by Sars, although the latter does not 

 mention the size of his specimens. The separation of the head and 

 of the fifth segment and the structure of the fifth legs, however, 

 leave little doubt of the identity. This is the first report of the 

 species from American shores. 



Genus CORNUCALANUS Wolfenden, 1905 



Head separated from the first segment ; fifth segment also separated 

 from the fourth, its posterior corners pointed or rounded ; urosome 4- 



segmented in female, 5-segmented in 

 male, anal segment minute; second 

 maxillae with a stout, curved terminal 

 claw; exopods of first four pairs of 

 legs 3-segmented; first endopod 1-seg- 

 mented, second endopod 2-segmented, 

 third and fourth endopods 3-segmented ; 

 fifth legs uniramose in both sexes, sym- 

 metrical in the female, asymmetrical in 

 the male. One species found here. 



CORNUCALANUS CHELIFER (Thompson) 



Figure 50 



Scolecithrix chelifer I. C. Thompson, Ann. 



Mag. Nat. Hist., ser. 7, vol. 12, p. 21, pi. 5, 



figs. 1-9, 1903. 

 Cornucalanus chelifer With, Danish Ingolf- 



Expedition, vol. 3, pt. 4, Copepoda 1, p. 222, 



pi. 7, fig. 4, or-h; pi. 8, fig. 15, a-g, 1915. 



Occv/rrence. — One female from the 

 trawl wings. Station 2093, Albatross; 1 

 Figure 5q.— Cornucalanus chelifer: female taken in a vertical haul. Station 

 a Female, fifth legs; 6, male, 10313 Grampus, the former south of 



fifth legs ; c, female, lateral , ' 



Marthas Vineyard. 



Distribution. — Northern Atlantic (Farran) ; Indian Ocean (Wolf- 

 enden) ; Cape Verde Islands, Faroe Islands, Iceland (With). 



Color. — Body a uniform yellowish wdiite and more or less opaque, 

 without pigment markings of any sort (Rathbun). 



Female. — Forehead with a crest, at the upper end of which is a 

 dorsal spine, pointed forward and downward; posterior corners of 

 fifth segment triangular and bluntly rounded ; urosome one-third as 

 long as metasome ; second maxillae with a stout terminal claw, acu- 

 minate and strongly curved; fifth legs 3-segmented, the two basal 

 segments rather short and naked, the end segment slender, tapered, 

 and tipped with a single spine and a fringe of hairs on the outer 

 margin, just behind the terminal spine. Total length, 8-9 mm. 



