COPEPODS OP THE WOODS HOLE REGION" 



209 



DACTYLOPUSIA VULGARIS Sars 



Figure 139 



Davtylopus stroini Claus, Die frei lebenden Copepoden, p. 126, pi. 16, 1863. 

 Dacttjlopusia vulgaris Sars, Crustacea of Norway, vol. 5, p. 128, pi. 79, fig. 1, 

 1905. 



Occurrence. — Two females in a surface tow in Great Pond, Fal- 

 mouth; found by Sharpe in Little Harbor and among Fucus on the 

 Bureau of Fisheries wharf, Woods Hole. 



Distribution. — British Isles (Brady) ; coast of France (Canu) ; 

 Helgoland (Claus) ; coast of Bohuslan (Cleve) ; coast of Norway 

 (Sars) ; Charlestown Pond, li. I. (Williams) ; Woods Hole (Sharpe). 



Color. — Body dark yellow to olivaceous-brown, deepened along the 

 margins of the segments and in the grooves between them ; eye bright 

 red. 



Female. — Body short and stout and much depressed; urosome 

 scarcely half as long as metasome, each of its segments fringed with 

 spinules along the posterior margin; 

 genital segment distinctly divided ; 

 caudal rami about three times as wide 

 as long. First antennae 9-segmented; 

 apical claws of rami of first legs slen- 

 der, slightly curved, and spinulose; both 

 segments of fifth legs with a row of 

 transverse chitin ribs along the inner 

 margin, basal expansion with five setae, 

 the second outer one the longest ; distal 

 segment narrowed at the tip, with two 

 apical setae, the outer of which is non- 

 plumose and half the length of the inner, 

 three outer and one inner setae. Total 

 length, 0.6-0.75 mm. 



Male. — Smaller than female; first antennae geniculate, the terminal 

 portion shortened and the aesthetask lengthened; distal segment of 

 second endopod twice as long as wide, with two apical spines of equal 

 length, and a longer, slender spine on the outer margin; distal seg- 

 ment of fifth legs armed with seven setae, only one of which is 

 reduced in size and nonplumose. Total length, 0.5-0.6 mm. 



Rem-arks. — This species can be told by its small size and by the 

 presence on both segments of the fifth legs of the transverse chitin 

 ribs. Sars said it w^as one of the most common harpactids on the 

 Norway coast, but in the present area it is not so common as the 

 other two species of the genus. 



FiGUUE 139. — Dactylopusia vul 

 (juris: a. Female, fifth leg; 

 b, male, fifth leg. (Prom R. W. 

 Sharpe, Proc. U. S. Nat. Mus., 

 vol. 38, p. 420) 



