COPEPODS OF THE WOODS HOLE REGION 267 



Female. — Slender and tapered regularly backward, with the seg- 

 ments separated by deep constrictions, but with no sharp demarca- 

 tion between metasome and urosome. Cephalic segment of moderate 

 size, a little shorter than the rest of the metasome; rostrum short, 

 broadly rounded, poorly defined at its base, and armed at its tip 

 with two minute setae. Fifth segment shorter than the fourth; 

 genital segment distinctly divided; anal segment shorter than the 

 penultimate segment; caudal rami one-half longer than wide, with 

 squarely truncated tips, the inner apical seta as long as the meta- 

 some, the outer seta close to the tip of the ramus. All the body 

 segments including the head are fringed with short hairs on their 

 lateral and posterior margins. 



The first antennae are much shorter than the cephalic segment and 

 their two basal segments are somevv^hat enlarged. The two seg- 

 ments of the endopod of the second antennae are about the same 

 length; the distal segment carries three geniculate setae and three 

 clawlike spines; the exopod is very short and rudimentary and 1- 

 segmented, tipped Avith two minute setae. 



In the first legs the 3-segmented exopod reaches but little beyond 

 the center of the basal endopod segment, is without inner setae, 

 and its end segment carries two apical geniculate setae and two 

 spines. The endopod is twice the width of the exopod, its ba,sal 

 segment is fringed with scattered hairs on both lateral margins, 

 and its terminal claw is very long and slender, and abruptly currved 

 near its tip. The second exopod is thick and stout, its end segment 

 is fully as wide as its basal segment, and carries one apical and one 

 inner setae and four spines. The endopod just reaches the tip of 

 the second exopod segment and its two segments are about the 

 same length; the distal segment carries two apical setae and two 

 inner setae, the proximal one very small, the other three very elon- 

 gate. In the third and fourth legs the endopod does not reach the 

 center of the middle exopod segment and its distal segment is more 

 than twice the length of the basal segment. In the third legs the dis- 

 tal segment carries two apical setae, one on the outer margin and 

 three on the inner margin; the two apical setae and the inner seta 

 next to them are much elongated. In the fourth legs the distal seg- 

 ment carries two apical, one inner and one outer setae, the first three 

 greatly elongated. The end segment of the third exopod has at its 

 apex one seta and one spine, both elongated, three outer spines and 

 one inner seta ; the end segment of the fourth exopod has at its apex 

 two elongate setae, two outer spines and one inner seta. 



In the fifth legs the distal segment is somewhat trapezoidal in 

 form and projects more than half its length beyond the basal ex- 

 pansion; it is armed with six setae, the innermost of which is much 



