COPEPODS OF THE WOODS HOKE REGION 



351 



(Thompson and Scott) ; Antarctic Ocean (Brady) ; South Africa 

 (Cleve, Stebbing) ; Adriatic (Steuer, Pesta) ; North Sea (van Bree- 

 men) ; Malay Archipelago (A, Scott) ; Greenland (Stephensen) ; 

 North Atlantic (Cleve); California coast (Esterly). 



Color. — Body only semitransparent, yellowish gray, the yellow 

 deepest in the basal segments of the first antennae, the mouth parts, 

 and the swimming legs. Front 

 of the head and pigment spots 

 on the metasome brick red; 

 eggs orange. 



Female. — Metasome ellipti- 

 cal, the width much less than 

 half the length ; second segment 

 with a conspicuous hump on 

 the dorsal midline; urosome 

 less than one-third the length 

 of the metasome; genital seg- 

 ment more than twice as long as 

 abdomen; caudal rami as long 

 as anal segment. End segment 

 of second antenna nearly as 

 long as middle segment, its two 

 groups of setae widely sepa- 

 rated. A conical projection between the two apical spines of the 

 second, third, and fourth endopods; fifth leg cylindrical, its inner 

 seta twice as long as the outer one. Total length, 0.75-1.25 mm. 



Male. — Considerably smaller than female, no dorsal hump on 

 second metasome segment; genital segment three times as long 

 as abdomen, lappets at its posterior corners large, triangular, 

 sharply pointed, and turned outward. Fifth leg not articulated 

 with the body segment, its apical setae very unequal. Total 

 length, 0.6-0.8 mm. 



Remarks. — The great inequality of the apical setae of the fifth legs 

 is the best single character of this species. Its presence in both polar 

 regions as well as in the Tropics shows that it can adapt itself to 

 considerable changes in temperature. 



ONCAEA BOREALIS G. O. Sars 

 FiGUEEJ 211 



Oncaea lorealis Saks, Crustacea of Norway, vol. 6, p. 191, pi. 108, 1918. 



Occurrence. — Several females were taken in a surface tow on 

 Georges Bank, September 15, 1874. 



Distribution. — Polar ocean, north of Siberia (Sars) ; British Isles 

 (Brady) ; Norwegian coast (Sars). 



FiGUHH 210. — Oncaea conifera: a. Female, lat- 

 eral (after Giesbrecht) ; 5, female, uro- 

 some ; c, male, urosome 



