CUMACEA. ■> 



EUDORELLA SIMILIS. 



(Figs. 1-6 on Plate.) 



Description of sidi-ndult female. — Total length 5"8 mm. The antero-lateral margin 

 (fig. 2) of the carapace ends below in a strong curved tooth, aljove whieli 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 ujapcr margin of the pseudorostrum is 

 convex, without any projection behind, and bears a tuft of long setae. 



The penultimate abdominal somite Ijears on its posterior margin above a pair of 

 very long sette. 



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 E. truncatula as figured by Sars. 



The uropods (fig. 6) show no conspicuous ditiercncc from those of E. truncatuhi, 

 except that the rami are somewhat stouter. 



Adult male. — Total length, 6 mm. The anterior margin of the carapai-e (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 tlie 

 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. M^-ny specimens. ' Coulman 

 Island, 100 fathoms,' 1 specimen. 



Beinarks. — Among the eight species of this genus which have been described from 

 northern seas (North Atlantic and Mediterranean), E. eminyinata (Kroyer) stands some- 

 what apart, having no distinct antennal notch in the carapace of the female. Of the 

 remainder, only E. IiispiJa and E. nana, G. 0. 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 Eudorella 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 whicli no trace is to be seen in tlie ' Discovery' 

 specimens. 



