CRUSTACEA MALACOSTRACA. 109 



Occurrence. Hitherto this species has only once been taken by the "Thor". 

 South-West of the Faeroes: 6i° 15 1 N. L., 9 35' W. L., 450—500 fm.; 4 spec. 



Distribution. Hitherto only known from localities west of Ireland where it was taken 

 several times in depths from 180 to 382 fm. (Holt & Tattersall). 



22. Pseudomma roseum G. O. Sars. 



PI. V, fig. 2 a — 2 b. 



1870. Pseudomma roseum G. O. Sars, Forh. Vid. Selsk. Christiania f. Aar 1869, p. 154. 

 ! 1870. G. O. Sars, Mon. Norges Mysider, I, p. 54, Tab. IV. 



Occurrence. The "Ingolf" has twice taken this species. 



Davis Straits: St. 35: 65 16'N.L,., 55 05' W. L., 362 fm., temp. 3-6°; 1 spec. 

 - - 27:64° 54' - 55° 10' - 393 - - 3"8°; 4 - 



It has also been obtained at other localities; at the first named it was taken by Admiral 

 Wandel, at the others by the "Thor". 



Davis Straits: 66° 49' N. L., 56° 28' W. L., 235 fm., temp. 4-4°; 1 spec. 



South of Iceland: 63° 05' N. L,., 20 07' W. L., 300 fm.; 5 spec. 



South-West of the Faeroes: 6i° 15' N. L., 9 35' W. L., 450—500 fm.; 9 spec. 

 — - 6i°o8' — 9 28' — 434 fm.; 3 spec. 



Distribution. As P. frigidum n. sp. has to be separated as a distinct species from P. roseum, 

 the distribution offers some difficulties, as Sars has mixed the two species and it is not always possible 

 to determine with certainty to which of them the specimens from certain of the localities mentioned 

 in the literature have belonged. It is certainly this species, which Sars has had before him from 

 localities on southern and western Norway up to West Finmark, 100 — 450 fm. The specimens mentioned 

 by S. I. Smith as taken at New England, at ca. 40° N. L., 500 fm. and in the Gulf of Maine, 105 fm., 

 probably belong to this species likewise, and it is not unlikely that his specimens taken in the Gulf 

 of St. Lawrence in no and 210 fm. also belong here. Specimens given from distinctly arctic localities 

 all belong probably to P. frigidum and are mentioned under that species. Holt & Tattersall's state- 

 ment in 1905 of the occurrence of P. roseum in localities west of Ireland has arisen from an error 

 which the authors corrected in their subsequent paper published in 1906. 



23. Pseudomma frigidum n. sp. 



Pl.V, fig. 3 a -3 b. 



Description. Stands extremely near to P. roseum, but is much larger, the adult female of 

 the latter species being only ca. 15 mm. long whilst two females of P. frigidum (from "Ingolf St. 138) 

 measure 25-2 mm. from the anterior edge of the eye-plate to the end of the telson; the single male I 

 have is 23 mm. But the species may be even larger, as Ohlin gives 28 mm. for the female, 24 mm. 

 for the male. The eye-plate (fig. 3 a) is almost as in P. roseum, but the serrulation is a little less 

 developed. The antennal squama (fig. 3 b) offers a prominent characteristic: the smooth part of the 



