Cumacea: 9. Leuconidae, 2. Eudorella 77 



half; the S"*^ joint by fusion with the apical spine becomes mucronate, but 

 even with the fusion is only two-fifths of the length of the P* joint. Colour 

 whitish tinged with grey or yellow. L. about 12 mm. 



Norwegian Coast, depths 56—549 m ; Spitzbergeu, depths 20—435 m; W. Green- 

 land, 772 m; Atlantic coast N.America, 13— 12Hm; Heligoland; British Isles, 37— 108 m; 

 Nova Zembla, 61 — 90 ra. 



2. E. gracilior Zimmer 1907 E. g., Zimmer in: Zool. Anz., v. 37 p. 228 tf. 2, 3 | 

 1909 E. g., Zimmer in: Ergeb. Schwed. Siidpol.-Exp., v. 6 nr. 3 p. 2, 12 t. 3 f. 53— 55, 

 t. 4 f. 56— 68. 



Body and limbs as compared with E. sordida (nr. 13) somewhat more 

 slender. Truncate front fringed with short hairs and smooth except for a 

 very small denticulate prominence above the smooth sinus, which is bounded 

 below by a slightly upturned tooth followed by slight denticulation of the 

 lower margin; the sinus, of moderate depth in the Q, is almost evanescent 

 in the 6. The o^^ pleon segment dorsally projects a group of (4) setae 

 over and beyond the short telsonic segment, which is more produced between 

 the bases of the uropods in the d than in the Q , ending conically in the 

 former, almost squarely in the latter. Antenna 1 Q, with many plumose 

 setae, 2"*^ joint of peduncle the longest, equal to the 4-jointed fiagellum, 

 accessory as long as 1^^ joint of the principal. Antenna 2 of 9 1-jointed, 

 with 4 plumose setae. Peraeopod 1, 6^*1 joint more than twice as long as 

 7th_ 5th intermediate in length. Peraeopod 2 having the widened terminal 

 joint at least as long as antepenultimate, begirt with spines. Peduncle of uropods 

 a little shorter than the endopod but longer than its 1^* joint, having on its 

 upper side near the end a seta which reaches beyond the rami; exopod 

 broad, two-thirds as long as endopod, 1^* joint of the latter between 3 and 

 4 times as long as the 2""^, its medial margin fringed with numerous unequal 

 spines, apical spine of the 2""^ joint distinct. Colour white. L. about 7 mm. 



S. Georgia, depths 75 — 310 m. 



3. E. fallax Zimmer 1909 E. f., Zimmer in: Ergeb. Schwed. Siidpol.-Exp., 

 ^;.6 nr. 3 p. 2, 9 t. 2 f. 32-39, t. 3 f. 40— 47. 



Pseudorostral lobes with very small haii's on the rounded top, scarcely 

 any on the slightly convex front which descends without serration to the 

 shallowly quadrate sinus bounded by a small antero-lateral tooth, with very 

 feeble serration of the lower margin. In the d even not adult the sinus 

 disappears. First pedigerous segment firmly united with the carapace. The 

 5^11 pleon segment dorsally projects a succession of 6 setae over the short 

 telsonic segment. Antenna 1 9, 2»d joint considerably longer than P* or 3'^. 

 fiagellum 4-jointed, accessory almost as long as 1^* and 2^^^ joints of principal 

 combined. Antenna 2 9 with 3 setae on 1^* JQjnt, small 2"*^ joint faintly indi- 

 cated (in figure). Peraeopod 1, 6*11 joint not much longer than 5*^ Perae- 

 opod 2, spinose 7*^ joint as long as 5*^ and 6*^ combined, firmly fixed in 

 an excavation of the 6*^. Peraeopod 5 comparatively very small. Peduncle 

 of uropods rather shorter than endopod, of which the 1^* joint is subequal 

 to the exopod and more than twice as long as the 2"* joint, with setae on 

 the upper part and unequal spines on the lower part of its medial margin, 

 the series being continued on the 2^^ joint, which ends in a strong distinct 

 spine. Colour white. L. 9 varying round 6*5 mm. 



S. Georgia, depths 64—310 m. 



