COPEPODS OF THE WOODS HOLE REGION 



53 



female, 5-segmented in male ; caudal rami short, with fine hairs on 

 their inner margins; first antennae slender and not as long as the 

 body ; exopods of first four pairs of legs 3-segmented ; first endopod 

 1 -segmented, second 2-segmented, third and fourth 3-segmented; fifth 

 legs lacking in female, present and biramose in male. 



KEY TO THE SPEOIES (BOTH SESES) 



1. First anteniiae reaching the first abdominal segment ; spines at 

 posterior corners of fiftli segment slender and nearly as long 



as genital segment tenuispinus (p. 53) 



First antennae reacliing tip of caudal rami ; spines at posterior 

 corners of fifth segment small and scarcely visible — brevispinus (p. 54) 



GAroiUS TENUISPINUS (G. O. Sars) 

 FlGtTRE 33 



Chiridius tenuispinus Saes, Norwegian North Polar Expedition, 1893-1896, 



vol. 1, no. 5, Crustacea, p. 67, pi. 18, 1900. 

 Gaidius tenuispinus Sabs, Crustacea of Norway, vol. 4, p. 162, pi. 18, 1903. 



Ocourrence. — Two females from trawl 

 wings, Station 994, Fish Hawh; 5 fe- 

 males from trawl wings. Stations 2093, 

 2195, 2230, Albatross, south of Marthas 

 Vineyard. 



Distribution. — Polar seas, Norwegian 

 coast (Sars) ; North Atlantic (Farran) ; 

 California coast (Esterly) ; Arctic Ocean 

 (Mrazek) ; Faroe Channel, Antarctic 

 Ocean (Wolfenden) ; English seas (Pear- 

 son, T. Scott) ; Greenland (Vanhoffen, 

 Damas) ; North Sea (van Breemen) ; 

 Davis Strait, Denmark Strait, Iceland 

 (With) ; Gulf of Maine (Bigelow). 



Color. — Body translucent and whitish, 

 with a large red spot near the anterior 

 margin of the head (Rathbun). 



Female. — Spines at posterior corners of fifth segment slender, 

 nearly straight, and about as long as the genital segment; urosome 

 one-fourth as long as metasome; genital segment protruding ven- 

 trally ; caudal rami slightly longer than wide, rounded at their tips, 

 the two proximal segments of first legs fused, without an outer spine. 

 Total length, 3.5-3.8 mm. 



Male. — Spines at posterior corners of fifth segment reaching 

 beyond the distal margin of the genital segment; urosome slender 

 and more than one-third as long as metasome ; anal segment almost 



I 



a 



Figure 33. — Oaidiua tenuispinus: 

 a. Female, dorsal ; b, male, 

 fifth legs (r, right leg) 



