380 PROCEEDINGS OF THE NATIONAL BIVSEUM. vot.. 39/ 



The maxillipeds have small and weak terminal claws, each bearing 

 two huge setse, much larger than the claw itself. The second joint of 

 these maxillipeds reaches well in front of ail the other mouth parts, 

 and overlaps the base of the second antennse for half its length. The 

 labium is large and is nearly a half circle in outline, extending back 

 from about the center of the basal joint of the second maxilla, on 

 either side. 



The rami of the first swimming legs are each two-jointed and armed 

 with extra large and flattened setfe, three on each exopod joint, one on 

 the basal and six on the terminal joint of the endopod. The second, 

 third, and fourth legs have each a four-jointed exopod and a three- 

 jointed endopod, the latter being longer than the fornij^r. The 

 arrangement of the spines and setae is as follows: Second exopod, 

 I-O; I-l; II-l; 1-5: endopod, 0-1; 0-2; 1-3: third exopod, I-O; I-l; 

 I-l; 1-5: endopod, 0-1; 0-2; 1-3: fourth exopod, I-O; I-l; I-l; 1-4: 

 endopod, 0-1 ; 0-1 ; 1-2. The fifth legs are each composed of a single 

 two-jointed ramus, the basal joint short, the terminal one four times 

 as long as wide, armed with a single seta on the outer margin near the 

 center, and three of unequal length at the end, the inner one tmce 

 the length of the middle one and the latter twice the length of the 

 outer one. 



Color a light brown, inclining to green on the dorsal siu^face, paler 

 and yellowish below. 



Total length, 2.14 mm. Cephalothorax, 0.65 mm. long, 0.9 mm. 

 wide. Length of free segments, 0.7 mm.; of abdomen, 0.7 mm. ; of 

 egg-strings, 1 mm. 



{teres, graceful, slender.) 



The National Museum collection contains two lots of this species, 

 both obtained from the gills of the common menhaden, Brevoortia 

 tyrannus, at Woods Hole, Massachusetts. The lots are numbered 

 38606 and 38607, U.S.N.M., and the former are made the types of the 

 new species. The species is quite rare, the examination of many fish 

 yielding but a few specimens. 



Genus PSEUDOEUCANTHUS Brian. 



Cephalothorax elliptical or somewhat ovate, with a continuous 

 raised border around its margin. Second to the sixth (genital) seg- 

 ments all free and of about the same wddth, which is three-fifths that 

 of the carapace. Abdomen suddenly contracted to one-third the 

 width of the genital segment, three times as long as wide; anal laminae 

 longer than the last segment; Fhst antennae cylindrical and four- 

 jointed, the basal portion neither enlarged nor flattened nor bent at a 

 right angle. The second antennse three-jointed and like those of 

 Bomoloclms. Mandibles strongly curved, simple and smooth; first 



