KEW SPECIES OF EDEIOPHTHALMA. 227 



CUMACEA. 



Fam. Leuconid^, 



Leuconopsis, n. gen. 



A. 0. Walker, Eeport on the Marine Zool. of the Irish 



Sea, Brit. Assoc. Eeport for 1896, p. 419 (1897). 



Pemale with a distinct two-jointed appendage to the fourth 

 pair of feet, not furnished with natatory setse. Lower antennae 

 short, with the third joint conical, with three minute one-jointed 

 rudimentary flagella. Eami of uropoda subequal. 



Male with the third pair of feet each provided on the second 

 joint with a pair of curved blade-like processes. 



Remaining characters as in Lexicon. 



Letjconopsis EiTsiiEE, A. 0. Walher. (PI. 17. figs. 1-1 li.) 



'Female. Carapace about as long as the free thoracic segments ; 

 dorsal crest of fourteen teeth beginning about the middle of the 

 upper margin and curving down to the base of the rostrum ; a 

 small tooth on the upper and near the posterior margin ; lower 

 margin with the anterior half coarsely toothed and forming with 

 the anterior margin an acute angle, the upper portion of which 

 is finely toothed. Rostrum about a quarter the length of the 

 carapace, obliquely truncate, almost horizontal; lower margin 

 with two or three teeth near the extremity and two or three near 

 the base. 



Fourth pair of legs with an exopodite or imperfect natatory 

 appendage, two-jointed, reaching nearly to the end of the first 

 joint, which is as long as the remaining four. 



Telson triangular, as in Leucon. 



TJropoda with peduncle and both rami subequal in length ; 

 peduncle almost sj)ineless, inner ramus with six unequal spines 

 on the inner and two on the outer side of the first joint ; second 

 joint with two very short spines on the inside ; outer ramus 

 obliquely truncate, with five plumose setse on the inner side and 

 four at the end. 



Length 5 1 mm. 



Male. Upper margin of carapace as long as the free segments ; 

 lower margin with five or six teeth on the anterior half, increasing 

 in size anteriorly, forming a right angle with the anterior margin, 



LINN. JOITEir. — ZOOLOGY, YOL. XXYI. 16 



