CUMACEA. 3 
EUDORELLA SIMILIS. 
(Figs. 1-6 on Plate.) 
Description of sub-adult female.—Total length 5:8 mm. The antero-lateral margin 
(fig. 2) of the carapace ends below in a strong curved tooth, above which the margin 
is concave, becoming convex and bearing about four very slightly marked teeth 
immediately below the well-defined antennal notch. Above the notch the margin is 
nearly straight, and is without teeth. The upper margin of the pseudorostrum is 
convex, without any projection behind, and bears a tuft of long sete. 
The penultimate abdominal somite bears on its posterior margin above a pair of 
very long sete. 
The antennules (figs. 3 and 3a) have both rami rather stouter than is usual in the 
genus and armed with strong spines. 
The maxillipeds and legs agree very closely in their proportions and armature with 
those of FE. truncatula as figured by Sars. 
The uropods (fig. 6) show no conspicuous difference from those of E. truncatula, 
except that the rami are somewhat stouter. 
Adult male.-—Total length, 6 mm. The anterior margin of the carapace (fig. 4) is 
strongly convex, projecting well in front of the single small tooth which defines it 
below. 
In the outer ramus of the antennule (fig. 5) the proximal segment is equal to the 
other three together. The inner ramus reaches to the end of the second segment of 
the outer. 
Occurrences.—W.Q., June 15, 1902. D-net. Many specimens. ‘Coulman 
Island, 100 fathoms,’ 1 specimen. 
Remarks.—Among the eight species of this genus which have been described from 
northern seas (North Atlantic and Mediterranean), EZ. emarginata (Kréyer) stands some- 
what apart, having no distinct antennal notch in the carapace of the female. Of the 
remainder, only £. hispida and E. nana, G. O. Sars, agree with the present species in 
having a strong tooth at the antero-lateral angle of the carapace. In both of these 
species, however, the antero-lateral margin has strong teeth above as well as below the 
antennal notch in the female. The only species of H'udorella hitherto recorded from 
the Southern Hemisphere is E. splendida, Zimmer, from South Georgia. The figure of 
this species is not entirely satisfactory, but it suggests that the form of the antero- 
lateral margin of the carapace is very similar to that of the present species. The 
specimens examined by me might, in fact, have been identified with Dr. Zimmer's 
species, were it not that the latter has the upper edge of the pseudorostrum produced 
behind into a strong curved tooth, of which no trace is to be seen in the ‘ Discovery’ 
specimens, 
