COPEPODS OF THE WOODS HOLE REGION 



161 



of Bureau of Fisheries, in Cuttyhunk Harbor, in the Eel Pond, in 

 Green Pond and Great Pond, Falmouth ; from trawl wings, Stations 

 955 to 961, Fish Hawk^ by Rathbun, in Buzzards Bay; surface tow 

 in John Pond, Falmouth, and Great Pond, Barnstable; in Waquoit 

 Bay, Falmouth, and the small pond at the head of the bay; on 

 Marthas Vineyard in small pond near Oak Bluffs, Farm Pond, 

 Sengekontacket Pond, Nashaquitsa Pond, and Edgartown Great 

 Pond; on Chappaquiddick Island in Poucha Pond and two of the 

 small ponds along the shore of Katama Bay; in Gosnold Pond on 

 Cuttyhunk Island; in West End Pond on Naushon Island. 



Figure 109.- — Acortia tonsa: a, Male, dorsal; h, female, dorsal; c, male, 

 fifth legs ; d, female, fifth legs. (From W. M. Wheeler) 



Disfrihution. — Tropical Pacific (Giesbrecht) ; Australia (Dana) ; 

 North Atlantic (Cleve) ; California coast (Esterly) ; Narragansett 

 Bay (Williams); Woods Hole (Wheeler, Fish). 



Color. — Body translucent to transparent, with a faint bluish or 

 greenish tinge, just strong enough to make the living copepods visible 

 over a dark background. Sometimes a bluish, greenish, or whitish 

 pigment forms a few scattered spots, especially on the ventral sur- 

 face around the bases of the mouth parts and the swimming legs. 

 The eye spot is black in the center, but shows red around the edges. 

 In the male the eye is farther back than in the female and dark red, 

 and there is a patch of brown at the base of the mouth parts. 



Female. — Corners of fifth segment smoothly rounded, without 

 spines; urosome one-third as long as metasome; genital segment as 

 long as the abdomen and caudal rami combined ; anal segment hairy 

 on each lateral margin ; second segment of fifth legs as wide as long ; 

 end segment swollen proximally, coarsely toothed centrally, abruptly 



