78 AXEL OHLIN, ARCTIC CRUSTACEA. 



station off the West coast of Norway, and at another S.W. 

 of Jan Mayen. Metzger mentions it from Skagerack SW. of 

 Lindesnäs, and Smith from Grulf of Maine and Gnlf of St. 

 Lawrence. It was also obtained at Matotschkin Schar (Stux- 

 berg). It must, therefore, be regarded as belonging to the 

 cold area of the North Atlantic. 



It ranges vertically from 60 — 70 fathoms (Matotschkin 

 Schar) up to 400—500 fathoms (Hardanger Fiord). 



Lcngtii of largest male 24 mm. 

 » » » female 28 mm. 



33. Pseudomma Théeli n. sp. 



Fig. 5. 



Eye-scales qnite coalesced, non-serrated, without anj* 

 trace of a median fissure, seen from above representing an 

 equilateral triangle, the lateral sides of which are somewhat 

 sinuated. Antennal scale relatively much longer than in the 

 other species, iive times as long as they are broad, its onter 

 margin terminating, as nsual, in a strong spine, which, how- 

 ever, is situated, contrary to what is the case in the other 

 known species, at the apex of the scale. In this respect it 

 comes nearest to Pseudomma Sarsi/ Willemoes-Suhm, and is 

 farthest remote from Pseudomma ausfrale, in which this spine 

 is situated very near the base of the scale. Pseudomma 

 Thccll and Pstudomma austrair thus represent the extreme 

 poles in regard to the relative length of the outer margin 

 as compared with the inner setoiis one, the other species 

 being interniediate links in the series. 



Telson is also of a very diiFerent appearance than in the 

 allied species. It is very long and narrow, with the lateral 

 sides a little sinuated. It is five times as long as it is 

 broad (at the apex). This is subtruncated, armed with 10 

 strong spines, the median ones being as long as the apex is 

 broad. Only three or four very small lateral spines are on 

 each side above the apical ones. I was not able to detect 

 any trace of the median pair of slender plumose setse which 

 oceurs in the other .species. 



In the general appearance Pseudomma ThécH reserables 

 the type species, viz. Pseudomma rosoum In the structure 



