off from each other, the former provided at the end of the 1st joint behind 

 with a well developed plumose seta; terminal part a little shorter than the 

 basal one, and provided outside, at some distance from the end, with 2 small 

 juxtaposed setae; apical claw of moderate size and accompanied by 2 curved 

 bristles. Endopodal part of maxillae with the terminal joint rather produced 

 and fringed inside with 3 setae, its outermost part cut off as a well defined 

 apical joint carrying 4 setae. Posterior maxillipeds with the middle joint well 

 defined, and armed inside with a curved spiniform seta; terminal joint com- 

 paratively small and fringed with 4 setae. The 4 anterior pairs of legs with 

 the rami rather slender and somewhat unequal in size, the inner one being 

 the longer, especially in 1st pair; spines of outer ramus very thin, almost 

 setiform. Last pair of legs with the proximal joint very broad at the base; 

 distal joint slender, sublinear, with the edges somewhat waved and clothed 

 with small hairs and spinules. 



Male of smaller size than female, and rather unlike it in its general 

 appearance, the body being very slender, attenuated behind, and quite straight, 

 with the 1st trunkal segment united with the head. Caudal rami still more 

 slender than in female, and having the apical setae more fully developed and 

 distinctly ciliated. Anterior antennae built on the very same type as in the 

 male Notodelphyidce, being composed of 10 joints, the last 2 of which are 

 much larger than in female and together form a movable terminal part admit- 

 ting to be impinged against the preceding part of the antenna. The remaining 

 appendages of exactly same structure as in female. 



Body of female, in the living state, of an uniform light reddish hue; 

 ripe ova of a similar, though somewhat darker colour. 



Length of adult female attaining 4.50 mm., of male 2.40 mm. 



Remarks. The above described form, the only species as yet known of 

 the present genus, may be easily distinguished from the other Doropygidae by 

 its comparatively slender and less compressed body, as also by the unusually 

 long and narrow caudal rami. The female is at once recognised as a true 

 Doropygid by the characteristic ventral curvature of the body and the gib- 

 bously prominent incubatory pouch. The male, on the outer hand, may on 

 the first sight easily be taken for a Notodelphyid, exhibiting, as it does, a 

 much similar form of the body and a similar transformation of the anterior 

 antennae. 



Occurrence. Several specimens of this form have been collected by me 

 at different times and in different places, both on the south and west coasts 

 of Norway. Most of the specimens were taken from the branchial cavity of 



