COPEPODS OF THE WOODS HOLE REGION 455 



styliform process scarcely reaching the middle of the second seg- 

 ment. Second and third segments about the same length, fourth 

 segment a little longer and enlarged where it joins the fused fifth 

 and genital segments. Each of these three segments has a pair of 

 small dorsal plates, which are narrowed anteriorly and adherent to 

 the dorsal surface, the whole of which they do not cover. The fused 

 fifth and genital segment is a little wider than the three preceding 

 segments, cylindrical, and more than twelve times as long as wide, 

 with straight sides. Abdomen composed of a single segment, one- 

 sixth as long as the genital segment, four times as long as wide, 

 tapered somewhat at both ends, and attached to the genital segment 

 on a level with the ventral surface of the latter. Caudal rami short, 

 two and a half times as long as wide, each tipped with three minute 

 setae. 



First antenna 6-segmented, the basal segment the longest, the ter- 

 minal segment tipped with two slender spines and a fingerlike process, 

 the other segments sparingly armed with spines and without setae. 

 Second antenna slender, the dactylus of the terminal chela with a 

 small accessory spine on its inner margin, the fixed finger nearly 

 straight and hollowed at the end to receive the tip of the dactylus. 

 Basal segment of maxilliped considerably swollen, bent outward 

 near its proximal end and sharply pointed at its distal posterior 

 corner ; terminal claw slender and bent abruptly beyond its center. 



The rami of each of the first four pairs of legs are about equal in 

 length; the two basal exopod segments carry a spine at the outer 

 distal corner and a seta on the inner margin. The terminal segment 

 has two outer spines and four plumose setae in the first legs, and two 

 outer spines and five setae in the other three pairs of legs. The basal 

 segment of the endopod has an inner seta in all four pairs, the second 

 segment has an inner seta in the fourth pair only, but along the 

 outer margin of this segment in all four pairs of legs there is a row 

 of small papillae on the ventral surface close to the margin. The 

 tips of these papillae project slightly beyond the margin and each 

 carries two or three long cilia ; the margin itself is also fringed with 

 cilia. The terminal segment of the endopod in the first three pairs 

 of legs carries six stout setae, in the fourth legs only three setae. 

 There are no spines on the ribs connecting the bases of the pairs of 

 legs as is common in most of the species of this genus. Total length, 

 10.5-12 mm. Carapace and free segments combined, 2-2.2 mm. 

 Width of carapace, 1.25 mm. ; of genital segment, 0.65 mm. Ovisacs. 

 7 mm. long. 



Male. — Carapace one-half wider than long; cephalic area some- 

 what narrowed posteriorly; styliform processes not reaching the 

 center of the second segment. Second, third, and fourth segments 

 about the same width, which is one-third that of the carapace; 



