190 THE SCHIZOPODA. 
as to Gnathophausia zoéa Will.-Suhm, Sergestes arcticus Kr., and Sergestes robustus 
Smith, ‘“‘that small specimens are often at least found nearer the surface than 
the larger and that the wholly developed specimens are always only met with 
in deeper layers.” 
B. SuBoRDER MYSIDA. 
BOREOMYSIS G. O. Sars (1869). 
8. Boreomysis media, sp. nov. 
Plate 1, figs. 2a-2b. 
Sta. 4652. Nov. 11,1904. Lat. 5° 44.7’ S., long. 82° 39.5’ W. 400 fms. to surface. 1 adult female 
Sta. Gee 12,1904. Lat. 5° 57.5’S., long. 80° 50’ W. 400fms.tosurface. 1 adult female. 
Sta. 4675. Nov. 22,1904. Lat. 12° 54’S., long. 78° 33’ W. 300fms.tosurface. 1 adult female. 
Description — Frontal plate very considerably produced (fig. 2a), with 
the transition between the front margin and the oblique lateral margin consid- 
erably curved; the front margin is produced in a conspicuous, triangular, acute 
rostrum. Eyes of very moderate size, brownish, somewhat depressed, scarcely 
as broad as the end of the stalk, which is a little broader than long and with — 
a triangular process of moderate size on the upper surface. The antennal | 
squama somewhat short, only three times as long as broad, with the outer 
margin nearly straight, the inner considerably convex and the end scarcely more 
than half as broad as the squama a little behind the middle; the terminal margin 
somewhat oblique and the outer tooth very distinct. 
Exopod of uropods (fig. 2b) eight times as long as broad, with a couple 
of spines placed a little beyond the end of the proximal sixth of the outer margin. 
Telson scarcely three times as long as broad, because its proximal third is very 
broad; from the end of that third the telson tapers strongly to the beginning 
of the distal fourth, where it is narrow, only two fifths as broad as at the base; 
its terminal fourth widens feebly to the end; the incision, which occupies one 
fifth or one sixth of the whole length, has no angles on its margins and its proxi- 
mal part is shaped as a triangle with its two sides a little convex. Each lateral 
margin from the end of the proximal third to near the distal end is furnished 
with about 10-11 moderately small spines and 18-20 very small spines, the 
latter regularly arranged between the former and generally two small spines 
in each interval (fig. 2b, a); along the distal part of the margin the spines are 
more equal in size, small. 
Length of a female with marsupium (from Sta. 4652) 19.5 mm. 
