NO. 1805. DESCRIPTIONS OF WEW COPEPODS— WILSON. 627 



minal claw on the maxilJipeds slender, bent into a half circle two-thirds 

 the length of the basal joint, and carrying a tiny spine on its ventral 

 surface one-third the distance from the base. 



Furca short and stout, rami divergent and strongly curved. First 

 legs slender, the basal joint with a rudimentary two-jointed endopod 

 on its posterior margin; the tliree terminal claws with compound 

 tips, made up of several points or teeth, and with a row of saw-teeth 

 along each lateral margin. 



Spines on the exopods of the second legs large and finely toothed 

 along both margins. Spine at the base of the exopod of the third 

 leg also large and bifurca,ted, the ventral branch shorter than the 

 dorsal. Both rami of these third legs distinctly three-jointed. 



Basal joint of the fourth legs enlarged into a broad lamina, three- 

 fourths as wide as long; the three terminal joints the same length as 

 the basal and armed with simple spines, all about the same length. 



Total length 10 to 14 mm. Carapace 4.1 mm. long, 4 mm. wide. 

 Free segment 0.8 mm. long. Genital segment 2.75 mm. long, 2.75 mm. 

 wide. Abdomen 2.5 mm. long. Egg-tubes 12 mm. long. 



Male. — Posterior body shorter and relatively smaller than in the 

 female; carapace elliptical and as large as that of the female, with 

 the same general proportions. The body behind the carapace, how- 

 ever, is only half as long as in the female, and relatively narrower, 

 thus making the carapace more than half tlie entire length. 



Free segment two-thirds the width of the genital segment and wid- 

 ened through the bases of the fourth legs. 



Genital segment two-fifths the width of the carapace, nearly cir- 

 cular in outline, but broken at the posterior corners by the attach- 

 ment of the fifth legs; on the ventral surface there is also a sixth pair 

 of legs, inside the fifth pair and a little posterior to them. 



Abdomen one-jointed and lacking the lateral lobes found in the 

 female, somewhat shorter than the genital segment and only half as 

 wide. 



Maxillary hooks not much enlarged; first maxillge without the acces- 

 sory tooth on the inner margin; fourth legs with a much smaller basal 

 joint, otherwise like the female. 



Total length 7.25 mm. Carapace 4 mm. long, 3.9 rnm. wide. 

 Genital segment 1.5 mm. long and the same width. Abdomen 1.1 

 mm. long, 0.8 mm. wide. 



Color of young specimens a rich cream yellow, becoming orange 

 brown with maturity, the color being deepest over the convolutions of 

 the oviducts and vasa deferentia in the genital segment. 



Ten specimens of this species, including two males, were obtained 

 from the outside surface of the head of a great barracuda, (Sphy- 

 rxna barracuda), by Dr. Edwin Linton at the Tortugas, Florida, and 

 are numbered 39613, U.S.N.M. 



