15,6 DISCOVERY REPORTS 



publications ; of some species a later worker has added to or corrected the description 

 of an earlier without completely redescribing it ; three varieties of E. similis have been 

 described in three separate papers ; some of the characters of E. longirostris have been 

 described in one paper some in another; E. hanseni has been described from female 

 specimens only, from an unknown locality ; no previous worker has had a collection, 

 such as the present one, large enough in numbers and wide enough in range to enable 

 the limits of the distribution of most of the species to be recognized. For these reasons 

 illustrated descriptions of the ten species are given here ; the figures are new, the de- 

 scriptions based upon new material. 



The five species whose development from the second Calyptopis stage upwards is 



described are : ^ /r/;?/Wa E. longirostris 



E. valktitini E. spinifera 



E. triacantha 



loo 



Fig. I. Chart showing positions of the stations made in the Falkland Sector in the summer of 193 1-2. 

 The position of the edge of the pack-ice is shown by a scalloped line, the loose pack-ice along the course 

 of the cruise in the Weddell Sea by irregular hatching. 



