COPEPODS OF THE WOODS HOLE EEGION 249 



acter of the mouth parts and swimming legs, but it differs markedly 

 in the first antennae, the second maxillae, the fifth legs, and the 

 caudal rami. Its habitat is also very different, since it is a burrower 

 in the sand at or below low-water mark. 



KEY TO THE SPECIES (BOTH SEXES) 



1. Caudal rami as wide as long, with a short apical spine, 2 setae 



and a short seta on dorsal surface brevicaudatus, new species (p. 249) 



Caudal rami longer than wide, with a long apical spine, 4 setae 



and a long seta on dorsal surface katamensis, new species (p. 251) 



PARALEPTASTACUS BREVICAUDATUS, new species 



Plate 9 



Occurrence. — One hundred males and females were washed from 

 the sand of Buzzards Bay bathing beach at Woods Hole, July, 1927. 

 The male holotype is U.S.N.M. No. 63428. This sand was washed 

 for the purpose of obtaining nematodes for Dr. N. A. Cobb; the 

 copepods were washed out with the nematodes and kindly turned 

 over to the author for study. 



Color. — Body transparent and whitish, without pigment markings ; 

 eggs white. 



Female. — Cephalothorax the longest segment in the body, the 

 other segments all about the same length except the anal segment 

 which is shorter. Rostrum triangular, not well defined at the base, 

 and bluntly pointed at its tip; genital segment not divided; anal 

 segment half as long as penultimate segment, anal operculum 

 fringed with minute spines along its posterior margin. Caudal rami 

 as wide as long, each with a short triangular spine at its inner distal 

 corner, a long seta just outside of the spine, a short seta on the outer 

 margin, and a stout seta on the center of the dorsal surface. The 

 long apical setae are often curved like parentheses and are about as 

 long as the urosome. 



The first antennae are a little longer than the cephalic segment 

 and 7-segmented, the second segment the longest with a longitudinal 

 row of three setae on the dorsal surface near the distal end. From 

 the inner distal corner of the fourth segment a slender aesthetask 

 extends nearly to the tip of the antenna; the terminal segment is 

 about as long as the two preceding segments combined, and is well 

 armed with setae. The endopod of the second antenna is 2-seg- 

 mented, the basal segment twice the length of the terminal with 

 some indications of division at the point of attachment of the exo- 

 pod; the latter is short, 1-segmented, and tipped with two unequal 

 setae. The second maxillae have two terminal claws of about the 

 same length, an outer spine, and an inner process tipped with two 



