COPEPOlDS OF THE WOODS HOLE REGION 



81 



Distribution. — North Atlantic and Pacific (Giesbrecht) ; California 

 coast (Esterly) ; South Atlantic (Cleve) ; Gulf of Maine (Bigelow). 



Color. — Body colorless and somewhat opaque, turning white in 

 formalin ; eye a bright ruby red. 



Female. — Head with a high frontal crest ; genital segment convex 

 ventrally ; first antennae reaching the tips of the caudal rami ; exopod 

 of second antenna one-fourth longer than endopod; fifth legs rela- 

 tively small, made up of two seg- 

 ments plus the fused basal portion, 

 end segment with a minute apical 

 spine and a stout outer spine, 

 setose distally and more than 

 three times the length of the seg- 

 ment itself, borne on a rounded 

 process. Total length, 4.5-5.3 mm. 



Male. — Head with high crest; 

 first antennae just reaching the 

 genital segment; basipods of left 

 fifth leg stout, elongate, cylin- 

 drical, endopod 1-segmented, 

 reaching the middle of the second 

 exopod segment, exopod 3-seg- 

 mented, the end segment much 

 narrower than the other two, and 

 tipped with two tiny setae ; second 

 basipod of right leg enlarged into 

 a sphere at its proximal end, en- 

 dopod 1-segmented, reaching be- 

 yond the tip of the second basipod, 

 exopod 2-segmented and unarmed. 

 Total length, 4.25^.5 mm. 



Remarks. — This species can be 

 recognized by the high frontal 



crest and the form of the fifth legs in both sexes. The two Grampus 

 stations recorded above are really outside the present area, but are 

 fairly close to it, and with the distribution indicate that the species 

 is likely to be found within the area at almost any time. 



Genus SCOLECITHRIX Brady, 1883 



Head fused with the first segment; fifth segment separated from 

 the fourth, its posterior corners rounded; urosome 3- or 4-segmented 

 in female, 5-segmented in male; first antennae no longer than the 

 metasome; exopods of first four pairs of legs 3-segmented; first en- 

 dopod 1-segmented, second endopod 2-segmented, third and fourth 



a 



Figure 55. — Scottocalanus persecans: a, 

 Male, dorsal (after A. Scott) ; 6, male, 

 fifth legs (after Giesbrecht) ; c, female, 

 fifth legs 



