163 



extremity only slightly attenuated. Rostral prominence exactly as in (1. tcuni- 

 xpintix, forming a very small conical projection. Lateral lobes of last segment of 

 metasome broadly rounded, spiniform process outside the tip extremely small. 

 Urosome scarcely attaining y 3 of the length of the anterior division; caudal rami 

 comparatively very short and somewhat divergent. Anterior antennae slender and 

 elongated, reaching, when retiexed. as far as the tip of the caudal rami. Posterior 

 antennae and oral parts almost exactly as in G. tenuispinus. First pair of legs 

 with the 1st joint of the outer ramus well defined, though, as in G. te>ittix]>iiins, 

 without any trace of a spine outside; inner ramus of 2nd pair distinctly biarticulate. 



Male unknown. 



Colour not yet ascertained. 



Length of adult female 4.80 mm. 



Remarks. This form is undoubtedly very closely allied to (1. t<'inii*i>i>iHx, 

 though easily distinguishable by its much larger size and somewhat more robust 

 form of body, the more elongated anterior antennae, and the small size of the 

 spiniform processes issuing from the last segment of the metasome. 



Occurrence. A solitary but well-preserved female specimen of this Arctic 

 form was found in the same sample (Stat. 34), in which the male of (r. tcuui- 

 spinus occurred. 



Distribution. Polar basin crossed by Nansen, at 6 different Stations (the 

 present author); Faroe Channel (Norman's Collection). 



Page 32. Undinopsis Bradyi, G. 0. Sars. 



Remarks. During the past summer I have found this form very plentiful 

 in one place near Aalesund, just at the bottom of a steep incline, on a sandy 

 bottom. Male specimens were by no means rare, and on a renewed examination 

 of the latter, I found that the right last leg is generally wholly absent. In some 

 few specimens from the same locality, otherwise indistinguishable from the others, 

 these legs, however, exhibited exactly the appearance figured on PL XIX, a distinct 

 rudiment of the right leg being present. 



Page 39. Euehseta norvegica, Boeck. 



Distribution. Scottish coast (Scott). 



Page 42. Euchaeta barbata, Brady. 



Distribution. Gulf of Guinea (Scott). 



