COPEPODS OP THE WOODS HOL.E REGION 



57 



coast of Ireland (Farran) ; Adriatic (Pesta) ; California coast 

 (Esterly) ; Malay Archipelago (A. Scott) ; North Sea (With). 



Color. — General body color reddish and not very transparent; the 

 red pigment is distributed very unevenly and is most dense along 

 the midline of the dorsal surface, on the posterior margins of the 

 thoracic segments, especially at the sides of the body, on the dorsal 

 surface of the genital segments, on the long plumose setae of the 

 second antennae, and on the proximal segments of the mouth parts. 

 The first antennae, the second pair all except the setae, the distal 

 portions of the mouth parts, the abdomen, and the caudal rami are 

 colorless (Rathbun), 



Female. — Forehead without a crest but with a rostrum; urosome 

 one-fifth as long as meta- 

 some ; genital segment 

 asymmetrical with a sack- 

 shaped protuberance on 

 the dorsal surface at the 

 left of the midline ; second 

 outer seta on the right 

 caudal ramus as long as 

 the body; exopod of sec- 

 ond antenna four times as 

 long as endopod; end seg- 

 ment of endopod with five 

 and four setae ; basipod of 

 fourth leg with only one 

 or two spines on inner 

 margin. Total length, 

 4.5-5 mm. 



Male. — Forehead with a 

 low crest and with a ros- 

 trum ; urosome one-fourth 

 as long as metasome and 

 symmetrical ; no elongated 

 seta on caudal rami ; fifth legs biramose, endopods 1-segmented, the 

 left one very rudimentary, possibly sometimes lacking; left exopod 

 3-segmented, rodlike, right exopod 2-segmented, end segment with a 

 row of sawteeth on the inner margin. Total length, 3.75-4 mm. 



Remarks. — The female of this species is distinguished by the sack- 

 shaped appendage on the genital segment and the length of the 

 exopod of the second antenna. The male can be told by the structure 

 of the fifth legs. It has never before been reported from the Ameri^ 

 can side of the North Atlantic, 



FiGDRE 36. — Euchirella messinensis : a. Female, 



dorsal ; b, male, fifth legs (r^ right leg) ; c, 



basipod of fourth leg of female (b, c, after 

 Giesbrecht) 



