56 
Key. A. M. Norman on Crustacea Cumacea. 
dition, in 250 fathoms, to the west of Shetland, lat. 60° 45' 
N., long. 3° 6' W. 
4. Diastylis echinata , Bate. 
1865. Diastylis echinata, Bate, Ann. k Mag. Nat. Hist. ser. 3, vol. xv. 
P-81, pi. i. fig- 1. 
The type specimen was dredged off Shetland ; and Sars has 
taken it in 100-300 fathoms on the coast of Norway (Har- 
danger and Christiania Fiords and Lofoten Islands). 
In 1868 it was dredged by the 1 Lightning ’ Expedition, 
Station 8, lat. 60° 10' N., long. 5° 59' W., in 550 fathoms. 
5. Diastylis Josephince , G. O. Sars. 
1871. Diastylis Josephines, CEfvers. af Kongl. Vet.-Akad. Forhandl. p. 77; 
id. * Josephines ’ Cumaceer, Kongl. Svenska Vetensk.-Akad. Handl. 
ix. p. 36, pi. xv. tigs. 72-74. 
The types of this Diastylis were dredged in 750 fathoms off 
the Portuguese coast (lat. 38° 10' N., long. 9° 25' W.), in the 
‘ Josephine ’ Expedition. It seems to be the commonest 
Cumacean inhabiting the deep waters between Faroe and 
Shetland. 
1 Lightning,’ 
1 Porcupine,’ 
V 
a 
1868 
1869 
Station. 
Lat. 
Long. 
lins. 
. . 6 
67° 
7' N. 
5° 
21' W. 
500 
. . 36 
48 
50 
11 
9 
725 
. . 47a 
59 
34 
7 
18 
542 
. . 75 
60 
45 
3 
6 
344 
. . 90 
59 
41 
7 
34 
458 
6. Diastylis polar is, G. O. Sars. 
1873. Diastylis polaris, Ct. O. Sars, Om Cumaceer fra de store dybder i 
Nordisliafvet, Kongl. Svenska Vetensk.-Akad. Iiandlingar, xi. no. 6, 
p. 4, pi. i. figs. 1-3. 
Cephalothorax, viewed laterally, elongated ovate, greatest 
depth subcentral. Carapace longer than free cephalothoracic 
segments, having two indistinct obliquely transverse rugae on 
the hinder portion, rough all over with microscopic spines of 
subequal size, and pitted all over, the pittings being more 
conspicuous on the portion posterior to the rugae, where also 
the microscopic spines are fewer in number ; lateral margin 
denticulately serrated on the anterior half; posterior margin 
elevated into a well-pronounced fillet. Second, third, and 
last cephalothoracic segments denticulate on their anterior 
margin ; last segment with the epimera not produced. Telson 
not quite equal in length to two preceding segments, sub¬ 
equal to peduncle of uropod, with 9-11 small spines on each 
side. Uropods slender; peduncle subequal to telson, with 12- 
