COPEPODS OF THE WOODS HOLE REGION 77 



fourth endopods 3-segmented ; the three posterior eiidopods with 

 coarse spines on the posterior surface ; fifth legs uniramose in female, 

 biramose in the male, one or both basipods swollen. 



KEJT TO THE SPECIES 



FEMALES 



1. Inner marginal seta of fifth legs more than three times length 



of terminal segment; head with a crest magnus (p. 77) 



Inner marginal seta of fifth legs less than twice length of the 

 terminal segment; head without a crest 2 



2. Apical and inner marginal setae of fifth legs close together, the 



former half as long as latter, or more obtusifrons (p. 79) 



Apical and inner marginal setae of fifth legs widely separated, 

 former less than one-fourth as long as latter validus (p. 78) 



MALBS 



1. The 2 rami of left fifth leg about equal in length and each made 



up of 3 segments 2 



The 2 rami of the left fifth leg very unequal in length, the 

 endoped 1-segmented, the exopod 3-segmented obtusifrons (p. 79) 



2. Eight endopod 1-segmented, more than half as long as the narrow 



distal portion of second basipod magnus (p. 77) 



Right endopod of fifth legs less than one-third as long as the 

 narrow distal portion of second basipod validus (p. 78) 



SCAPHOCALANUS MAGNUS (T. Scott) 

 FiGUEB 52 



Amallophora magna T. Scott, Trans. Linn. Soc. London, Zool., ser 2, vol. 6, 



pt. 1, p. 55, pi. 4, figs. 5-9, 1894. 

 Scaphocalanus magnus A. Scott, /gi&o^a~Expeditie, 29a, Copepoda, pt. 1, p. 97, 



1909. 



Occun^ence. — One female from trawl wings. Station 2219, Alba- 

 tross; one male, surface tow, Georges Bank, 1872; three females, 

 vertical haul. Station 20044, Grampus. 



Distribution. — Antarctic Ocean (Wolfenden) ; North, South, and 

 tropical Atlantic (Farran, Pearson, Wolfenden) ; North Pacific 

 (Giesbrecht) ; California coast (Esterly) ; Malay Archipelago (A. 

 Scott) ; Denmark Strait, Iceland (With) ; Norwegian coast (Sars) ; 

 Faroe Channel, Gulf of Guinea (T. Scott) ; Arctic Ocean (Due 

 d'Orleans) ; Gulf of Maine (Bigelow) ; Greenland (Damas and 

 Koef oed) . 



Color. — Body colorless and more or less opaque, without pigment 

 markings. 



Female. — Forehead with a long low crest; posterior corners of 

 fifth segment sometimes angular, sometimes mucronate ; first two seg- 

 71937—32 7 



