Rev. A. M. Norman on Crustacea Cumacea. 59 
(the last two segments being mutilated in the specimen), and 
the first two are furnished with swimming-feet. 
The slight differences in the above characters from those of 
the type might, for the most part, be easily accounted for 
by difference in age and size, as Sars’s specimen measured 
10 millims.; the only points of distinction of any consequence 
are :—1st, that although the 1 Porcupine ’ specimen is smaller, 
it has more spines on the uropods than Sars’s ; and 2nd, the 
presence of a spine between the last legs*. It must be left 
to the future to determine whether there is any value in these 
distinctions. 
‘ Porcupine ’ Expedition, 1869, Station 36, lat. 48° 50' N., 
long. 11° 9 f W., 725 fathoms. 
Sars says of his type of D. stygia, “ Habitat in mari arc- 
tico, latit. 78°, longit. Occident. 2° 28', in profunditate porten- 
tosa 2600 orgy arum.” 
11. Diastylis Bradyi, n. sp. 
Female. Gephalothorax having the dorsal margin unusually 
straight, the depth not being very unequal throughout; sub¬ 
equal in length to the pleon, exclusive of the telson. Cara¬ 
pace as long as the free segments ; lateral margin very minutely 
serrated throughout almost its entire length; surface with 
scattered spines of small and subequal size, and ornamented 
with lines of small spines, the points of which are directed 
forwards. These lines of spines map the carapace out into 
areas as follows:—The central lacinia is surrounded by what 
is a plica in front, but a row of spines at its hinder portion, 
and it is crossed by two transverse spine-rows ; the anterior of 
these passing into the lateral lacinia terminates at its junction 
with an arched spine-row, which, taking its origin from the 
lateral margin, sweeps upwards and forwards to the rostrum ; 
the second transverse spine-row passes right down to the 
lateral margin; further back is a third transverse spine-row, 
which, crossing the dorsum, curves at the sides forwards 
and either dies out or joins the second transverse spine-row. 
The anterior free segments have their front dorsal margin very 
minutely crenulated ; the last is widely separated from the 
preceding segment, and remarkable in its form and character; 
behind, the epimera (in both sexes) are greatly produced into 
large spine-like processes, while the anterior dorsal margin is 
cut into large teeth, alternating with conspicuous plumose setae, 
* I cannot say whether my specimen has the spines between the first 
three pairs of legs, which characterize D. stygia , as I was unwilling to 
mutilate the only specimen, which would have been necessary to get a 
good view of this part. 
