Rev. A. M. Norman on Crustacea Cumacea. 
57 
14 spines on inner margin ; inner ramus with first joint fur¬ 
nished with five, second with two, third with three lateral and 
a terminal spine ; outer ramus longer than inner, with 4-5 setae 
on external margin. Length 8-10 millims. 
At first sight near to D. lewis ; but the carapace, instead 
of being conspicuously setose as in that species, is rough with 
microscopic spines, the small and uniform size of which 
suffices to distinguish it from the spine-ornamented species 
with which we are acquainted, except D. styyia , G. O. Bars, 
which has not the rugae of D. polaris. Sars speaks of the 
rugte as one or three in number; in the above description, 
wdiich was drawn up before the species was described in Nor¬ 
way, it will be seen I mention two. 
Habitat. 1 Lightning,’ 1868, Station 3, lat. 60° 31' N., 
long. 9° 18' W., 229 fathoms. The type specimens were 
dredged by the Swedish Expedition in the Arctic Seas, lat. 
80°, long. 4° 33' E., in 950 fathoms. 
7. Diastylis biplicata , G. O. Sars. 
1864. Diastylis biplicata, G. 0. Sars, Om Cumacea, p. 46. 
This species has a great range in depth. The types were 
taken by Sars in 20-30 fathoms, off the Lofoten Islands ; and 
I have specimens dredged off the Durham coast in a few 
fathoms; but in the 1 Porcupine ’ Expedition of 1869 it 
occurred down to 1630 fathoms. The localities in that expe¬ 
dition are:— 
Station 2 
Lat. 
. . 51° 22' N. 
Long. 
12° 25' W. 
fms. 
808 
„ 11 . 
. . 53 24 
15 24 
1630 
„ 17 . 
. . 54 28 
11 44 
1230 
„ 18 . 
. . 54 15 
11 9 
183 
8. Diastylis spinosa , Norman. 
1868. Diastylis spinosa, Norman, Brit. Assoc. Report, p. 271. 
1878. D. bimaryinatus, Bate, Ann. & Mag. Nat. Hist. ser. 5, vol. i. 
p. 409. 
1878. D. bimarginatus, Sim, Ann. & Mag. Nat. Hist. ser. 5, vol. ii. 
p. 453, pi. xviii. figs. 3-5. 
A single specimen was taken, 1 Porcupine ’ 1869, in each 
of the following localities :— 
Lat. Long. fms. 
Station 6 . . . 52° 25' N. 11° 40' W. 90 
„ 18 ... 54 15 11 9 183 
The type was from Shetland ; and I have also procured the 
