CUMACEA FROM THE COPE]N"HAGEN MUSEUM. 21 



excluding the lateral cornua, a little over half its length. Lateral keels well marked. 

 Cornua prominent, directed obliquely outwards, situated behind the anterior third of 

 the length of the carapace. The postero-lateral margins are nearly straight. The 

 width of the posterior margin is about half of that measured between the bases of the 

 cornua. The pseudorostrum is prominent and formed of two rounded lobes. Antero- 

 lateral margins between pseudorostrum and cornua very slightly convex. The trans- 

 verse ridge on the lower surface on each side is faintly marked and does not reach the 

 lateral margin. Dorsal surface with a faintly marked median ridge posteriorly. The 

 ocular lobe is twice as broad as long, and the pseudorostral plates meet in front of it 

 for a distance much greater than its length. The eye is not pigmented, but there are 

 three large indistinctly defined corneal areas. The surface everywhere shows a 

 regularly reticulated texture, which is not interrupted by a faint and inconspicuous 

 pitting. 



Abdomen less than one-third longer than cephalothoracic region, scarcely narrowed 

 posteriorly. 



Antennules with very long and slender peduncle ; third segment one and a half times 

 as long as the second and a little longer than the first, about six times as long as broad. 

 External flagellum of three segments, about two-fifths as long as last segment of 

 peduncle. 



First legs long and slender. Basis little more than two-thirds of length of distal 

 segments together. Carpus about equal to the propodus and nearly half as long again 

 as the dactylus. 



The basis of the second legs has two or three rather coarse serrations on its inner 

 edge near the distal end. 



The uropods are more than one and a half times the length of the last somite. The 

 peduncle is about two-fifths of the length of the subequal rami. The inner edges of 

 the peduncle and endopod and both edges of the exopod are fringed with plumose sette 

 and the endopod also bears three small spinules. 



Bemarks. — The only species of Eocuma of which the male has been described is 

 E. taprohanica. From that species the present form is distinguished by the more 

 prominent frontal lobes, the less convex antero-lateral margins, the laterally projecting 

 cornua, the much longer and more slender antennular peduncle, and other characters. 

 It is unUkely that it will prove to be the male of any of the other known species, 

 since, even if the absence of antero-lateral teeth should prove to be only a sexual 

 character, the very narrow carapace and projecting lateral cornua, together with the 

 long first legs, seem sufficient to distinguish it. 



Occurrence. — " Suez, 31/1/98, H. Mortensen." Two specimens. Copenhagen 

 Museum. 



