A REVIEW OF THE MYSIDACEA 243 



listed must be regarded as tentative. For these reasons the species 

 has not been included in the key. 



These Hawaiian specimens need to be reexamined in the light of 

 Fage's report and the discussion of the species of Lophogaster given 

 above. 



SCOLOPHTHALMUS LUCIFUGUS Faxon 



Scolophthalmus lucifugus Faxon, 1893, p. 219 ; 1895, p. 226, pi. 55, figs. 1-le. 



Distribution. — Known only from the Pacific Ocean off the Galapagos 

 Islands. 



BOREOMYSIS NOBILIS G. O. Sars 



Figure 6 



Boreomysis nobilis G. O. Sars, 1879b, p. 428. — Stephensen, 1933, p. 9. — Tatter- 

 sall, 1939b, p. 282. 



Distribution. — Recorded by Stephensen (1933) from Greenland and 

 by Tattersall (1939) from the eastern waters of Canada off the coast 

 of Newfoundland. The species is an Arctic one confined to waters 

 where the bottom temperature is below zero, and in consequence it is 

 not likely to be met with in the deep boreal waters of the eastern coasts 

 of America. 



Remarks. — Figure 6 illustrates the salient characters of this species 

 and may serve as a guide to its identification. 



PSEUDOMMA BERKELEYI Tattersall 



Figure 48 



Pseudomma lerkeleyi Tattersall, 1933, p. 6, fig. 1. 



Description. — I reproduce here the original description and figures 

 of this species. 



Ocular plate (fig. 48, a) with a well-marked and relatively deep in- 

 cision in the median front margin ; anterolateral margins armed with 

 about nine very coarse teeth. 



Antennal scale (fig. 48, b) extending about one-quarter of its length 

 beyond the antennular peduncle; three and a half times as long as 

 broad ; outer margin terminating in a strong spine beyond which the 

 apex of the scale barely extends. 



Sixth segment of the abdomen 1% as long as the fifth. 



Telson (fig. 48, c) without the terminal spines as long as the sixth 

 segment of the abdomen; 1% as long as broad at its base and 2>y 2 times 

 as long as broad at the apex; apex arcuate and armed with three pairs 

 of very strong spines, the median pair about one-quarter as long as 

 the telson ; a pair of delicate plumose setae between the median spines 

 (broken in all the specimens) ; distal half of the lateral margins armed 



