COPEPODS OF THE WOODS HOLE EEGION 59 



EUCHIRELLA CURTICAUDA Giesbrecht 



Figure 38 



Euchirella curticauda Giesbkecht, Atti Accad. Lincei, Rome, ser. 4, vol. 4, 

 p. 336, 1888. 



Occu'i-rence. — There is as yet no record of this species within the 

 present area, but both sexes have been captured so close at hand that 

 it is Hkely to appear at any time in the future. 



Distribution. — North Pacific (Giesbrecht) ; North Atlantic (Wolf- 

 enden, Farran) ; Malay Archipelago (A. Scott) ; California coast 

 (Esterly) ; North Sea (van Bree- 

 men) ; Denmark Strait, Faroe 

 Channel, Iceland (With) ; Gulf of 

 Maine (Bigelow). 



Color. — Body fairly transparent, 

 with red pigment scattered along 

 the dorsal midline, on the basipods 

 of the swimming legs, and in the 

 plumose setae of the second an- 

 tennae, as in the other species. 



Female. — Forehead with a high 

 crest, but with only a vestige of a 

 rostrum; urosome less than one- 

 sixth as long as metasome and per- 

 fectly symmetrical; genital seg- 

 ment protruding ventrally ; none of 

 the caudal setae elongated; exopod 

 of second antennae four times as 

 long as endopod; end segment of 

 latter with 3 and 2 setae ; basipod of fourth leg with a row of 12 or 

 13 spines running from the inner margin along the posterior surface. 

 Total length, 2.5-4.8 mm. 



Male. — Forehead with a crest, without a rostrum; first antennae 

 extending little beyond the cephalothorax ; exopod of second anten- 

 nae only one and one-half times as long as the endopod; fifth legs 

 biramose, endopods 1-segmented, left exopod 3-segmented, right 

 2-segmented; the two legs about the same length. Total length, 

 3-3.75 mm. 



Remarks. — The species may be recognized by the high crest, the 5 

 setae at the tip of the endopod of the second antennae, and the row 

 of 10 to 13 short spines on the basipod of each fourth leg. In the 

 male the structure of the last segment of the right fifth exopod is the 

 most characteristic feature. 



Figure 38. — Euchirella curticauda: a. Fe- 

 male, dorsal (after Sars) ; h, male, last 

 segment of right fifth exopod ; c, uro- 

 some, ventral ; d, female, fourth basi- 

 pod {h, c, d, after Giesbrecht) 



