COPEPODS OP THE WOODS HOLE REGION 



155 



legs less than half the length of the exopod, with two apical spines 

 of equal length, the inner one acuminate, the outer one blunt; exopod 

 with two very unequal spines at the tip, three smaller ones on the 

 outer margin, and one larger one on the inner margin. Total length, 

 3.95-4.25 mm. 



Male. — Right lobe on fifth segment longer than left; urosome 

 5-segmented, the genital segment enlarged on the left side, the other 

 segments and the caudal rami symmetrical; left fifth leg ending in 

 three processes, the two outer ones blunt, the inner one widened and 



Figure 105. — PontcUa loiiancoi: a, Male, dorsal (after 

 Giesbrecht) ; b, male, fifth legs; c, female, fifth legs 



flattened, its inner margin fringed with minute setae ; thumb of chela 

 on right leg nearly as long as finger, the hand with a single flat and 

 rounded process at the center. Total length, 3.33-3.75 mm. 



Bemiarks. — This species can be recognized by its near approach to 

 symmetry and by the details of the fifth legs, especially those of the 

 male. It has not been reported before from our American coasts, 

 and its distribution would seem to indicate that it is a tropical species 

 that comes north in the Gulf Sream. 



Genus PONTELLINA Dana, 1853 



Head separated from the first segment; fifth segment fused with 

 the fourth, with sharp-pointed lobes at the posterior corners; meta- 

 some a little more than half as wide as long, narrowed anteriorly; 

 urosome 2-segmented, one-third as long as metasome; exopods of 



