CRUSTACEA MALACOSTRACA. III. 



219 



it is impossible to decide whether the differences originate from inaccuracies in his figures, or if the 

 specimen figured by him in reality is an animal taken pelagically and belongs to a species allied 

 to that parasitic on Onisimus plautus. 



Occurrence. The female and male described were found in the marsupium of Onisimus leu- 

 copis G. O. Sars taken by the "Ingolf" at the following station. 



North-East of Iceland: Stat. 120: Lat. 67°2c/ N., Long. ii°32 r W., 885 fath., temp, -f- ro°. Further- 

 more the "Ingolf captured a larva in second stage at the following place. 



North of the Fseroes: Stat. 139: Lat. 63°36' N, Long. 7°3o' W., 702 fath., temp. -=- o-6°. 



At West Greenland Cand. mag. K. Stepheusen captured in Skovfjord a similar larva in a Nan- 

 sen net, 250 — 200 m. 



It may be mentioned here that in the marsupium of a specimen of Anonyx uugax Phipps 

 captured by Mag. R. Horring in Faskruds Fjord (East Iceland), 20 — 50 fath., I found a female cer- 

 tainly belonging to the genus Parapodascon, but whether it belongs to P. Stebbingii or to a hitherto 

 unknown species cannot be decided, as the male is wanting, and the female seems to be somewhat 

 misshapen from pressure. 



Distribution. Stebbing found the male on Onisimus plautus Kr. from the Barents Sea, Lat. 

 70°3o'8" N., Long. 49°4i'5" E., 52 fath. G. O. Sars states that he found the male on O. plautus at Bodo, 

 Finmark, furthermore in Plankton taken off the Nordland coast and in the glacial sea north of Siberia. 

 T. Scott recorded the male from gatherings near Cape Flora, Northbrook Island, Franz-Joseph Land. 



CumoechuS n. gen. 



Adult Female. Nearly globular (PI. XVI, fig. 5a). Half or more than half of the breadth 

 of the ventral side occupied by a peculiar longitudinal area stretching itself over nearly the whole length 

 of the surface; the major anterior part of this area is cleft along the middle, the margins of this cleft 

 being the margins of the thorax reaching one another, as the thorax is, as in Clypcoiiiscus, strongly 

 curved in order to constitute an incubatory cavity. Each half of this thoracic area is at its outer 

 margin raised distinctly above the adjacent surface of the body, and it is divided into six subareas 

 by impressions or furrows directed from the median cleft outwards and somewhat forwards. The sub- 

 areas increase somewhat in breadth from the first to the third and then decrease less to the sixth. 

 The first subarea shows near the inner margin on the surface a small lobe with the inner margin 

 semicircular and free, and not far from the outer margin of the area originates a leg (tr 2 ), which is four- 

 jointed with the first joint long and somewhat thick, the second considerably thinner and not half as 

 long as the first, the third as long as the second but much more slender, and the fourth quite small; 

 this appendage is probably second thoracic leg. When all eggs or young have been taken out of a 

 female, the part in front of second pair of thoracic legs can be examined, and we find quite minute 

 antennulse (fig. 5 b, a 1 ), a seemingly unpaired lamella (A), two pairs of lamellae (I 2 , k) and a pair of 

 appendages which seem to be six-jointed and almost certainly are the first pair of thoracic legs (tr 1 ). 



The basal joint of these legs is thick, and nearly as long as the other very slender joints combined. 



28* 



