37 



limits of the carapace, penultimate joint much longer than the antepenultimate 

 one ; 2nd pair exceedingly rohust, with the terminal joint broad and spatulate in 

 form, carrying numerous radiating spines. Uropoda with the inner minus con- 

 siderably produced, exceeding the basal part in length, its proximal joint armed 

 inside with numerous somewhat unequal spinules, outside with a row of short ci- 

 liated setae, the distal joint rather small, and exserted at the tip to a mucronate 

 point, outside which a long seta is attached. Uropoda of male with a number of 

 slender seta: inside the basal part and the proximal half of the inner raruus. 

 Colour whitish, with a more or less distinct grayish or yellowish tinge. Length 

 of adult female reaching to 12 mm., of male about the same. 



Remarks. This is by far the largest of the known species, and is, more- 

 over, easily recognizable, at least in the female sex, by the large semilunar 

 emargination in the lower part of the anterior edges of the carapace, and the 

 strongly prominent process defining this emargination below. The Cyrianassa 

 ciliata of Norman is unquestionably the adult male of this species. 



Occurrence. It is one of our commonest Cumacea, occurring rather plenti- 

 fully along the whole Norwegian coast, from the Christiania Fjord to Vads0, in 

 depths varying from 30 to 150 fathoms, soft muddy bottom. In habits it agrees 

 very closely with Leucon nasicus, together with which it is generally found, pos- 

 sessing, like the latter, great dexterity in burying itself in the loose bot- 

 tom material. 



Distribution. British Isles (Norman), Kattegat (Meinert), Heligoland 

 (Elirenbauru). Greenland (Hansen), Atlantic coast of North America (Verrill). 



7. Eudorella truncatula, Sp. Bate. 



(PI. XXIX.) 



Eudora truncatula, Sp. Bate, On the British Diastylidse. Ann. Mag. Nat. Hist. Vol. 17, p. 457, 



PI. 14, fig. III. 



Syn : Eudorella inermis, Meinert (male). 



Specific Characters. General form of body about as in the preceding 

 species, though perhaps somewhat less elongated, and with the tail narrower. 

 Carapace in female with the anterior edges smooth in their upper part, and 

 moderately setiferous, lower part cut off into 2 successive dentated prominences, 

 having between them a narrow sinus, antero-lateral corners not at all produced. 

 Carapace of male with the anterior edges quite entire, antero-lateral corners 

 rounded off, and armed with 3 or 4 denticles. Superior antennse resembling those 

 in E. cmaryinata, but less abundantly setiferous, and having the last joint of the 



