COPEPODS OF THE WOODS HOLE REGION 23 



freckles being most numerous from the center to the front. Some 

 of the appendages, as well as the caudal rami, occasionally show simi- 

 lar spots. The bases of the first antennae are colorless, with irregu- 

 lar red spots; then the color becomes continuous and extends to the 

 tips, where it becomes fainter than at the center (Eathbun). 



Female. — Head fused with the first segment ; fifth segment rounded 

 at its posterior corners; first antennae not reaching the caudal rami. 

 Distal margin of the second segment of the basipod of the second, 

 third, and fourth legs armed with spines; inner margin of the first 

 basipod of the fifth legs with a straight edge, more coarsely toothed 

 than in flnTnarchimis. Total length, 1.75-2 mm. 



Male. — A little smaller than the female, the first antennae bent 

 in the shape of the letter S. The terminal segments of the right 

 fifth exopod with only 2 inner setae and a short terminal spine ; the 

 terminal segment of the left endopod with 3 setae. Total length, 

 1.7-1.8 mm. 



ReTnarJcs. — This is the smallest of the calanoids in the Woods Hole 

 region and can be recognized by that character alone. It was re- 

 corded by Wheeler from the Gulf Stream south of Marthas Vine- 

 yard, and neither Sharpe nor Fish found it in the immediate vicinity 

 of Woods Hole. This indicates that it is pelagic in habit and is sel- 

 dom driven in near the shore. Although Wheeler's specimens came 

 from surface tows, Rathbun's were mostly obtained from the trawl 

 wings, some of them from depths of 1,500 fathoms. 



CALANUS FINMARCHICUS (Gunner) 

 FiGUKE 10 



MonoGulus finmarchicns Gunner, Ski'ifte Kjobenhavnske Selskabet, vol. 10, 



p. 175, figs. 20-23, 1765. 

 Calanus finmarchicus Saks, Crustacea of Norway, vol. 4, p. 9, pis. 1-3, 1901. 



Occurrence. — Forty males and females from trawl wings, Stations 

 1039, 1089, 1107, 1139, 1141, Fish Hawk; 25 males and females from 

 trawl wings, Stations 2096, 2195, Albatross; 50 males and females in 

 surface tow in Woods Hole harbor ; 60 males and females in surface 

 tow, Georges Bank ; 1.500 males and females at Stations 10253, 10280, 

 10306, 10328, 20044, 20048, 20076, 20178, Graniifus, in the Gulf of 

 Maine. 



Distribution. — Everywhere in all the oceans, including the Arctic 

 and Antarctic, and along both the Atlantic and Pacific coasts of 

 America. 



Color. — Almost entirely transparent and colorless, but always 

 showing a few irregular streaks of orange-red, blood red, or crimson 

 in the posterior part of the body on the walls of the intestine. Some 

 specimens have much of this coloring matter, while others have 

 very little; it sometimes appears in streaks, sometimes in blotches, 



