NO. 187G. ON THE CRUSTACEAN ORDER CUMACEA—CALMAN. 



625 



EUDORELLOPSIS BIPLICATA, new species. 



Onigerous female. — Total length, 5.5 mm. 



Carapace more than one-fourth of total length, onl}^ a little longer 

 than deep. Anterior margin shaped as in E. integra, but more sinuous, 

 with a strong convexity at the base of the pseudorostrum; with a few 

 inconspicuous serrations in its upper part, interspersed with longish 

 setse. Pseudorostrum nearly vertical, acute, anterior margin con- 

 cave. On the side of the carapace are two oblique curved ridges. 



Fig. 25.— EUDORELLOPSIS BIPLICATA, FEMALE, FROSI THE SIDE. 



The first leg-bearing somite is firmly united to the posterior edge 

 of the carapace. The abdomen is about four-fifths as long as the 

 cephalothoracic region. The last somite is crossed by a very distinct 

 transverse groove and its posterior edge is broadly rounded, as seen 

 from above. 



The antennules resemble those of E. integra, and the spines which 

 they carry are comparatively few and inconspicuous. The mouth 

 parts do not differ greatly from those of E. 

 deformis, but the basis of the third maxillipeds, 

 measured along its inner edge, is nearly twice as 

 long as the distal segments together. The first 

 legs are rather longer than in E. deformis, and the 

 three distal segments diminish successively in 

 length. 



Peduncle of uropods about equal in length to 

 the last somite; width, as seen from above, about 

 half its length. Exopod more than one and one- 

 half times as long as the peduncle, narrowed at 

 the tip and curved outward, with rather long 

 sette on the inner edge and at the tip; outer edge 

 serrated distally and with a group of setse about the middle of its 

 length. Endopod shorter than the exopod, its stout terminal spine 

 reacliing about to the apex of the latter, with about 13 spines on the 

 inner and some small spines on the outer edge. 



Remarks. — From the three known species of the genus this new form 

 is at once distinguished by the two oblique ridges on the side of the 

 94428 °—Proc . N . M . vol .41—11 40 



Fig. 26.— EUDORELLOPSIS 

 BIPLICATA, FEMALE, LAST 

 SOMITE AND UROPOD. 



