trace of a subdivision of the 3rd joint. Posterior antennae and oral parts 

 scarcely different in structure from those parts in D. brevicornis. 1st pair of 

 legs very powerfully built, with the rami still shorter and stouter than in that 

 species, the outer one scarcely extending to the end of the 1st joint of the inner, 

 and having the apical claws shorter and less curved than in D. brevicornis: inner, 

 ramus with the 2 outer joints very short and less perfectly separated, apical 

 claws strong. Last pair of legs with the distal joint short, cordiform in shape, 

 being only slightly longer than it is broad at the base; inner expansion of 

 proximal joint extending nearly as far as the distal joint. Ovisac of moderate 

 size and rounded oval in form. 



Colour light yellow. 



Length of adult female 0.75 mm. 



Remarks. This form, which I believe is that recorded by Boeck under 

 the above name, is closely allied to D. brevicornis Glaus, agreeing with that species 

 in most of the structural details. It is, however, of larger size and considerably 

 more robust form of body, and may moreover at once be recognised by the 

 peculiar and very conspicuous dilatation which the innermost but one of the caudal 

 setae exhibits at the base inside, and of which no trace is found in D. brevicornis. 

 The form described and figured by Th. Scott as D. brevicornis in the 24th An- 

 nual Report of the Fishery Board for Scotland seems to be referable to the 

 present species. 



Occurence. I have met with this form not rarely in several places both 

 of the south and west coasts of Norway in depths ranging from 20 to 40 fathoms. 



Distribution. Scottish coast (Scott). 



Add also the following new genus and species : 



Gen. DaCtylOpOdOpSiS, G. 0. Sars, n. 



Generic Characters. General form of body resembling that in Dactylopu- 

 sia. Rostral projection well developed, lamellar. Anterior antennae short and 

 stout, with the number of joints considerably reduced. Posterior antennae with 

 the outer ramus small, but distinctly 3-articulate. Mandibles very strong, palp, 

 however, comparatively narrow, with both rami imperfectly developed. 1st pair 

 of legs rather small, outer ramus scarcely prehensile, inner unusually short and 

 only composed of 2 joints. Natatory legs well developed, with the rami subequal 

 in length. Last pair of legs with the distal joint small; inner expansion of proxi- 

 mal joint triangularly produced. 



