COPEPODS OP THE WOODS HOLE REGION" 265 



distal corner. The exopod is attached to the side of the basal endo- 

 pod segment near its base, is three times as long as wide, with two 

 equal apical setae. The maxilliped is short and stout, the inner mar- 

 gins of its two segments fringed with scattered hairs, the second seg- 

 ment but little swollen with a filiform seta on the ventral surface at 

 the distal end, the apical claw no longer than the second segment and 

 without an accessory bristle. 



Both rami of the first legs are 2-segmented, the exopod not reaching 

 the middle of the basal endopod segment, its two segments of equal 

 length, the distal one with three spines and two geniculate setae. The 

 basal endopod segment is the same width as the exopod segments, 

 four times as long as the distal segment, and fringed with hairs on 

 both lateral margins. The distal segment has an outer fringe of 

 long hairs and inside the base of the apical claw one long and two 

 short filiform setae. The endopods of the second and third legs do 

 not reach the center of the distal exopod segment; the end segment 

 of the second endopod has two long apical setae, a short one on the 

 outer margin, two short ones and a spine on the inner margin. The 

 end segment of the third endopod has two long apical setae, one short 

 seta and a spine on the inner margin, and hairs only on the outer 

 margin. 



The fourth legs are greatly modified and give origin to the specific 

 name, talipes, club-footed. Both rami are lamellar, strongly chitin- 

 ized, considerably widened, and entirely without setae. The two 

 basal exopod segments each carry a small outer spine, the distal seg- 

 ment is enlarged and lobed at its tip, with one small spine at the inner 

 corner. The basal segment of the endopod is unarmed, the distal 

 segment has a spine at each corner of the squarely truncated tip and 

 one on the inner margin. In pairing the chelae of the first antennae 

 of the male grasp the end segment of these fourth exopods on each 

 side. The hold thus obtained is so firm that it persists even in pre- 

 servatives, and it is very difficult to separate the pair without injury, 

 The fifth legs are 2-segmented, the basal expansion much reduced and 

 armed with three small setae, diminishing in size inwardly. The 

 distal segment projects half its length beyond the basal expansion 

 and is 3-lobed at its tip, the two inner lobes each with a single seta, 

 the outer one with a knoblike spine. Total length, 0.38-0.45 mm. 



Male. — A little smaller than the female, the cephalic segment longer 

 than wide and squarely truncated posteriorly ; the genital segment is 

 not divided ; the abdominal segments are much shorter than those of 

 the female, and the anal segment is longer than the penultimate seg- 

 ment, but the urosome is relatively wider. 



In the first antennae the two basal segments are enlarged and dis- 

 tinct, the third and fourth segments are fused into the hand of a 



