36 
joint. Inferior antennae in female with 3 plumose setae in front, distal joint im¬ 
perfectly defined. Oral parts exactly as in Leucon. Legs likewise rather similar, 
though comparatively more strongly huilt, especially the 2nd pair. 3rd pair in 
male scarcely transformed. Uropoda with the inner ramus longer than the outer, 
otherwise of a very similar structure to that in Leucon. 
Remarks. —This genus was established by Sp. Bate in the year 1856; 
but as the name, Eudora , at that time proposed, had already been appropriated 
in zoology, it was changed in 1867 by the same author to Eudorella. The genus 
is closely related to Leucon, exhibiting a very similar structure both of the oral 
parts and of the legs and uropoda; but still this genus is very easily recogniz¬ 
able by the apparently very different structure of the carapace, and the superior 
antennae also exhibit a rather characteristic appearance. We know as yet of 8 
species belonging to this genus, 3 of which belong to the fauna of Norway, and 
will be described below. 
6 . Eudorella emarginata, (Ivroyer). 
(PI. XXVII, XXVIII.) 
Leucon emaryinatus , Kroyer, Nat. Tidsskr. Vol. 2 (new series), p. 181, PI. 1, fig. 7. 
PI. 2, figs 3 a—li. 
Syn: Cyrianassa ciliata, Norman (male). 
i Specific Characters. —Body slender and elongated, though rather strongly 
built, and finely hairy all over, with 2 unusually long, juxtaposed bristles at the 
end [of the penultimate caudal segment dorsally. Carapace about the length of 
the 4 anterior exposed segments combined, and almost transversely truncated in 
front; anterior edges in female with a broad similunar emargination below, de¬ 
fined above by a rounded dentated prominence, below by a very prominent, 
somewhat upturned spinifonn process, upper part of the edges smooth and fringed 
with short uniform hairs. Carapace of male with the antero-lateral parts more 
expanded, and the emargination much smaller than in female. Superior antennae 
very strongly built, 1st joint of the peduncle broad and massive, the other 2 of 
about equal length, all 3 joints clothed on both edges with strong ciliated set®, 
outer flagellum about the length of the last peduncular joint, and likewise clothed 
outside with strong setae, inner flagellum about half the length of the outer, and 
tipped with 3 subequal setae; those of male with a dense fascicle of sensory fila¬ 
ments at the base of the outer flagellum, which is distinctly 4-articulate. Inferior 
antennae in female with 2 plumose setae inside the base, in addition to the 3 
usual setae of the anterior edge. 1st pair of legs projecting far beyond the 
