106 



exceeding half the length. Cephalic segment somewhat longer than the 4 suc- 

 ceeding segments combined, and narrowly rounded in front. Tail slender, almost 

 attaining the length of the anterior division; genital segment rather large, 

 exceeding in length the 3 succeeding segments combined, and slightly dilated in 

 its anterior part. Caudal rami rather produced, being about the length of the 

 last 2 segments combined, and somewhat lamellar, with the outer part slightly 

 narrowed, inner edge finely ciliated; outermost seta at a considerable distance from 

 the apex, and attached to a distinct ledge on the exterior margin, innermost seta 

 slender, exceeding the corresponding ramus in length; the inner mediate one 

 about half the length of the tail. Anterior antennae nearly as long as the 

 cephalic segment, and composed of 21 joints, the outer 3 constituting the ter- 

 minal part. Posterior antennae with the outer ramus very small and attached 

 about in the middle of the very slender 2nd joint. Natatory legs of a similar 

 structure to that in Collocheres gracilicauda, but more strongly built, especially 

 the 4th pair. Last pair of legs scarcely extending beyond the middle of the 

 genital segment; inner expansion of proximal joint obtusely triangular in form, 

 unarmed ; distal joint oblong oval in form, with the inner edge straight, outer 

 gently curved and minutely ciliated, tip obliquely truncated and provided with 

 3 small bristles. 



Body rather pellucid, of a whitish grey colour. 



Length of adult female 0.87 mm. 



Male unknown. 



Remarks. This form, as already mentioned, was described by A. Scott 

 as a species of the genus Collocheres, the characteristic structure of the oral tube 

 having escaped his attention, as also the difference in the arrangement of the 

 caudal setae. 



Occurrence. A few female specimens of this form were collected, many 

 years" ago, at Eggesb0nses, west coast of Norway, from a depth of about 20 fathoms. 



Distribution. OS Port Erin, west coast of Scotland (A. Scott). 



Gen. 24. ScOttOCliereS, Giesbrecht 1897. 



Syn: Acontiophorus. Scott (part). 



Generic Characters. Body of a similar slender form to that in the 3 

 preceding genera, the anterior division being only slightly dilated. Cephalic 

 segment scarcely compressed, its inferior edges being quite evenly curved; rostrum 



