62 Key. A. M. Norman on Crustacea Cumacea. 
joints and half of the antepenultimate; first joint strongly 
spined on the outer margin. Pleon having the fifth segment 
spinose on the posterior margin. Telson with nine pairs of 
lateral spines. Uropods having peduncle edged with fourteen 
spines ; inner branch, 1st joint with six, 2nd with two, 3rd with 
two marginal spines. Length 11 millims. 
Young male (sexual characters not fully developed) has the 
telson with seven pairs of lateral spines, and uropods with 
eleven spines on peduncle, four on 1st, two on 2nd, and two 
on 3rd joint of inner branch, and four small spine-like setee on 
outer margin of external branch. 
1 Valorous’ Expedition, off Holsteinborg, Station 5, lat. 66° 
59' N., long. 55° 27' W., 57 fathoms. 
This species approaches, but is quite distinct from, the 
N.E.-American Diastylis sculpta of Ears. 
14. Diastylis strigata , n. sp. 
Male. Carapace with antero-lateral corner produced for¬ 
wards in the form of a well-rounded and strongly serrated 
lobe ; rostrum short, spinose on the sides ; surface of carapace 
not spined, having two transverse and vertical plicaj on the 
anterior portion, and a third longitudinal plica running nearly 
parallel with, and a little within, the lateral margin, and 
joining the posterior of the vertical plicae at nearly a right 
angle; these plicae are all quite smooth (neither serrated nor 
spine-crowned). Inferior antennae reaching beyond the extre¬ 
mity of the uropods. Cephalothorax having the anterior 
dorsal margin of the last segment serrated, and the epimera 
produced backwards into well-developed pointed lobes. Last 
pereiopods have the basal joint excessively flattened through¬ 
out the greater part of its length, but rounded at the distal 
extremity. Pleon with a crest of three spines on the under¬ 
side of the first segment (similar in position and character to 
those of D. longipes, but fewer in number and of smaller size) ; 
viewed from above, the 1st and 2nd segments are seen each 
to have a pair of minute spines transversely placed ; 3rd, 4th, 
and 5th segments have a central dorsal line of minute spines ; 
these lines of spines are confined to the posterior portion of 
each segment, and the hindermost spine in each row is the 
largest; these three segments have also a crest of spines on 
the external angles of the ventral surface; the spines composing 
these ventral crests are of much larger size than those of the 
dorsal surface; and the crests of the 5th segment are more 
developed than those of the preceding segments (as is usual 
in males of the genus). First joint of posterior maxillipeds 
and of first pereiopods unarmed, except that there is a single 
