COPEPODS OF THE WOODS HOLE REGION 263 



fused with the first segment and shorter than the rest of the meta- 

 some. Urosome 4-segmented, the segments more or less expanded 

 into hiteral lamellae; genital segment divided in the middle; caudal 

 rami long and narrow. First antennae short, with not more than 

 7 segments ; exopod of second antenna 1- or 2-segmented, attached to 

 the side of the basal endopod segment. Exopod of first legs weak 

 and short, 2- or 3-segmented; endopod very strong, 2-segmented, 

 tipped with a single stout claw ; exopods of second, third, and fourth 

 legs 3-segmented; endopods 2-segmented, the third endopod 3-seg- 

 mented and otherwise modified in the male; fifth legs 2-segmented, 

 much reduced in the male. 



KEY TO THE SPEXIIES 



1. Fourth legs broad, laminate, and without setae_ talipes, new species (p. 264) 

 Fourth legs of normal form and armed with setae 2 



2. Caudal rami definitely shorter than anal segment ; cephalic seg- 



ment a little lunger than wide ; body much tapered^ 



manifera, new species (p. 266) 



Caudal rami about as long as anal segment ; cephalic segment 

 much longer than wide or as wide as long 3 



Caudal rami definitely longer than anal segment 5 



3. Distal segment and basal expansion of fifth legs each with only 



3 plumose setae mohammed (p. 269) 



Distal segment of fifth legs with 5 setae, basal expansion with 



4 setae nana (p. 271) 



Distal segment of fifth legs with 6, basal expansion with 5, setae 4 



4. Distal segment of fifth leg nearly as wide as long; third outer 



seta on basal expansion the longest stromii (p. 273) 



Distal segment of fifth leg one-half longer than wide ; middle 



seta of basal expansion the longest proxima (p. 274) 



Distal segment of fifth leg two and one-half times as long as 



wide; second outer seta on basal expansion the longest cornuta (p. 275) 



5. Caudal rami five times as long as wide, outer spine close to the 



tip ; no spines on dorsal surface of body longicaudata (p. 276) 



Caudal rami twice as long as wide, 2 outer spines at center of 



outer margin; no spines on body capillata, new species (p. 277) 



Caudal rami three times as long as wide, outer spine close to tip ; 



2 rows of dorsal spines on body horrida (p. 279) 



1. Endopods of second and third legs 2-segmeuted 2 



Endopods of third legs 3-segmented, of second legs 2-segmented 4 



2. Endopod of second leg only reaching tip of first exopod segment, 



a short angularly bent spine on inner margin of end seg- 

 ment manifera, new species (p. 266) 



Endopod of second leg i-eaching center of second exopod segment, 

 a long S-shaped spine on inner margin of end seg- 

 ment stromii (p. 273) 



Endopod of second leg reaching tip of second exopod segment, 

 no spine on inner margin of end segment 3 



