23 



in length the last 2 segments combined, each carrying in front of the middle 

 outside a very small, hair-like bristle and another stronger one at some distance 

 from the tip, the 2 middle apical setae very unequal, the inner one more than 

 twice the length of the outer, both very minutely denticulate. Anterior antennae 

 pronouncedly claviform in shape, the 3rd joint being considerably expanded, and 

 arching over the short recurved terminal part. Posterior antennae with the outer 

 ramus about the length of the 2 outer confluent joints of the inner. Natatory 

 legs with both rami of normal structure. Last pair of legs with the distal joint 

 about 4 times as long as the proximal one, narrow linear in form, and carrying 

 on the tip 2 unequal spines and between them a slender seta. Ovisac of mode- 

 rate size, oval in form, and containing a rather limited number of large glo- 

 bular ova. 



Colour whitish gray. 



Length of adult female 1.60 mm. 



Remarks. In its general appearance, this form bears an unmistakable 

 resemblance to Eucanuella spinifera Scott, to be described farther on, and 

 indeed, I was at first inclined to refer it to that genus. On a closer exami- 

 nation, however, it is found to differ in some points rather materially, the most 

 conspicuous difference being the peculiar structure of the caudal rami, also shown 

 in the succeeding nearly-allied species. 



Occurrence. Several specimens of this peculiar form, all of the female 

 sex, were found many years ago in the 0stnaes Fjord, Lofoten Islands. The 

 specimens were obtained by examining the loose muddy deposits taken up by the 

 aid of a light dredge from a depth of about 100 fathoms. 



ll. Cerviniopsis longieaudata, G. 0. Sars, n. sp. 

 (PI. xra, fig. 2). 



Specific Characters. Female. Very like the preceding species, but of 

 somewhat smaller size and more slender form of body. Anterior division, seen 

 dorsally, of almost uniform width throughout, rostral plate less broad. Last 

 segment of metasome ^without any lateral projections. Urosome (including the 

 caudal rami) fully as long as the anterior division, lateral projections of genital 

 segment much smaller than in C. clavicornis. Caudal rami exceedingly slender 

 and elongated, exceeding in length the 3 last segments combined, hair-like bristle 

 of the outer edge occurring behind the middle. Antennae and oral parts of much 

 the same structure as in the preceding species. Natatory legs, however, slightly 



