﻿jjQ CRUSTACEA MALACOSTR.\CA. 



outer edge to the tip of the marginal spine is but Httle less than twice as long as the oblique 

 setigerous distal edge measured to the base of the marginal spine, whereas in P. roscuvi the smooth 

 outer edge is only 3/2 times longer than the setigerous distal edge. The telson almost as in /-". roscmii. 



Occurrence. The "Ingolf has once taken the species. 



North-West of the Ficroes: vSt. 138: 63° 26' N. L., 7° 56' W. L., 471 fm., temp. -^o-6°; 8 specimens. 

 The Ryder expedition has also taken a single specimen, a male, south of Jan Mayen : 70° 32' N. L., 

 8° 10' W. L., 470 fm. Ohlin gives P. rosciini from 3 localities at East Greenland, namely, in Franz 

 Joseph Fjord, off the same fjord, and at 74° 30' N. L., i8°4o'W. L., depths from 42—53 fm. and down 

 to 132 fm.; as the localities are distinctly arctic and his specimens, as mentioned above, agree with 

 P. frigiduni in size, it is undoubtedly this species and not P. roscuni which he has had in his hand.s. 



Distribution. G. O. Sars in the Norwegian North-Atlantic Expedition mentions his having 

 Iiad unusually large specimens of P. rosctim from two localities in the cold area: the one of these at 

 63° 10' N. ly. off Norway, depth 417 fm., temp. -^ i-o°, the other is given as from "tlie tract of Ocean 

 south-west of Jan Mayen (Stat. 251)" — but some error must have crept in here as StaL 251 lies off 

 Lofoten (depth 634 fm., temp, -h- i'3°). The sjjecimens from these two localities have certainly been 

 P. frigiduiiK Further, I am inclined to believe that Stuxberg's determination, Matotschkin Shar, 

 60—70 fm., should also be relegated to this species. 



24. Pseudomma affine G. O. Sars. 



1870. Pseudonnna affine G. O. Sars, Forh. Vid. Selsk., Christiania, Aar 1869, p. 156. 

 ! 1872. — — G. O. Sars, Mon. Norges Mysider, II, p. 57, Tab. V, Fig. 13—22. 



11906. — — Holt &Tattersall, Fisheries, Ireland, Sci. Invest, 1904, V, p. 27, ri. Ill, figs. I— 6. 



Occurrence. The species has only been taken by the "Thor", at the following locality. 



South-West of the Fteroes: 6i°o8'N. L., 9° 28' W. L., 434 fm.; many specimens. 



Distribution. It has been taken in the north of western Norway up to Lofoten, ico— 200 fm. 

 (G. O. Sars). Has further been trawled by the "Thor" in the North Sea at 58° 32' N. L., 4° 18' E. L., 

 148 fm., and several times west of Ireland in depths from 120 to 500 fm. (Holt & Tattersall). Lo Bianco 

 states that he has seen specimens taken at 3 places in depths of over 500 and 600 fm. in the Mediter- 

 ranean, but I greatly doubt the correctness of his determination. 



Remark.s. As .shown by Sars, the eye-plate in the females is produced forwards in a cleft 

 process, by means of which they are easih- known from I\ roscum, but on the other hand the extent 

 of the marginal serrulation does not agree with Sars' description, as in m\ specimens the posterior 

 part of the lateral margin is smooth, so that the serrulated part is not much longer than in P. roseum, 

 whereas according to Sars the serrulation in P. a/Jiiic reaches to behind the lateral corner. The telson 

 in my specimens shows an intermediate stage between Sars' figures of P. roseum and P. a/Jinc, its 

 posterior margin being less broad than in the latter and with 3, at most 4, pairs of spines. Never- 

 theless I consider that my specimens, especially on account of the form of the eye-plate at the centre 

 of its anterior margin, must be referred to P. affine G. O. S. 



