COPEPODS OP THE WOODS HOLE REGION 305 



short; exopod short, 1-segmented, attached to the tip of the second 

 endopod segment, with two apical setae. Two distal segments of 

 both rami of first legs more or less fused; fifth leg indistinctly 2- 

 segmented, the distal segment nearly four times the length of the 

 basal segment, with five huge lancet-shaped setae, both margins of 

 which are dentate; no basal expansion but an outer filiform seta 

 representing the outer basal process; sixth legs present on genital 

 segment. Total length, 2.2-2.3 mm. 



Male. — Unknown. 



Reviarks. — This species can be distinguished by the exceptionally 

 long caudal setae and by the remarkable setae on the fifth legs. It 

 was reported for the first time from our American shore by the 

 present author in Bigelow's Plankton of the Offshore Waters of 

 the Gulf of Maine, Bulletin of the Bureau of Fisheries, volume 40, 

 part 2 (p. 305), without comment. 



Family METIDAE 



Genus METIS Philippi, 1843 



Body short and pear-shaped, much swollen; head fused with the 

 first segment and considerably longer than the rest of the body; 

 rostrum deflexed and not visible in dorsal view ; urosome one- fourth 

 the length of the metasome; genital segment imperfectly divided; 

 caudal rami about as wide as long, inner apical setae three-fourths 

 as long as the body. First antennae 5- to 7-segmented, the two basal 

 segments more or less fused and produced distally into a bealdike 

 process; second antennae tipped with coarse spines, the exopod ob- 

 solete; endopod of first legs 2-segmented, exopod and both rami of 

 the three following pairs of legs 3-segmented ; fifth legs rudimentary, 

 more or less fused, and unlike in the two sexes. A single large 

 ovisac. 



KEY TO THE SPECIES 

 FEMALES 



1. End segment of first exopod with 2 filiform setae and 2 coarse 



spines, all apical ; endopod tipped with 2 coarse spines 2 



End segment of first exopod with 1 slender apical spine, 1 inner 

 filiform seta, and 1 outer slender spine; endopod tipped with 

 2 setae natans (p. 306) 



2. The two fifth legs fused on the midline at the base only, each 



with 2 small apical knobs tipped with a seta ig'naea (p. 307) 



The two fifth legs fused for three-fourths of their length, each 



with 2 laminate apical lobes, without setae jousseaumei (p. 308) 



MALES 



1. End segment of first exopod with 2 plumose setae and 2 coarse 

 spines, all apical ; each fifth leg tipped with 2 short, stout 

 spines 2 



