COPEPODS OF THE WOODS HOLE REGION 



21 



and the absence of spines and setae on the inner margins of the 

 fifth basipods. 



CALANUS HYPERBOREUS Kr0yer 



Figure 8 



Calanus hyperioreus Kk0yee, Kong. Danske Vid. Selsk. Nat. Math. Afh., vol. 7, 

 p. 310, pi. 4, 1838.— Sars, Crustacea of Norway, vol. 4, p. 12, pi. 5, 1901. 



Occwrence. — Fifteen males and females in trawl wings, Station 

 1029, Fish Hawk, 4 males and females at surface, Station 981, Fish 

 Hawk; 1 female at surface, Station 1107, Fish Hawk; 4 females in 

 trawl wings. Station 2195, Albatross; 300 males and females and 

 many development stages at various stations of Grampus in Gulf 

 of Maine. 



Distribution. — Finmark and 

 Norwegian coast (Sars) ; 

 North Atlantic ( C 1 e v e ) ; 

 Greenland, Spitzbergen 

 (Kr0yer, Lilljeborg) ; North 

 Sea (Buchholz) ; Baffin Bay 

 (Norman) ; Jan Mayen Island 

 (Sars) ; Arctic seas (Mrazek) ; 

 Bering Strait (van Breemen) ; 

 Barents Sea, Davis Strait 

 (Vanhoffen, Stej^hensen) ; 

 Denmark Strait, Iceland, 

 Faroe Channel (With). 



Color.- — Entirely transpar- 

 ent except two elongate red 

 spots on the midline nearer 

 the ventral surface. One of 

 these is near the middle of 

 the cephalic segment, the 

 other at the posterior end of 

 the body. The bases of the 

 first antennae are transpar- 

 ent ; then two longitudinal red stripes become distinguishable under 

 a hand lens and extend a little more than half the entire length of 

 the antennae. They are followed by a single stripe running half the 

 remaining distance, and the tips are colorless and transparent like 

 the base (Eathbun). 



Female. — Head separated from the first segment; fifth segment 

 pointed at its posterior corners; first antennae extending for about 

 three segments beyond the tips of the caudal rami. First basipods 

 of fifth legs elongated and irregularly toothed on their inner mar- 

 gins. Total length, 7-10 mm. 



Figure 8. — Calanus hi/perboreus: a, Dorsal 

 surface of female ; &, fifth leg of male 



