59 
epimeral parts of last segment scarcely produced behind. Tail (exclusive of the 
terminal appendages) about the length of the anterior division, segments simple, 
unarmed. Eye fairly well observable and somewhat convex. Superior antennae 
of moderate length, the peduncle reaching somewhat beyond the tip of the pseu- 
dorostral projection, its 1st joint about the length of the other 2 combined. 
First pair of legs a little longer than the carapace, basal joint densely fringed 
with setae and slightly spinulous in its distal part, the last 3 joints scarcely 
differing in length; 2nd pair with the antepenultimate joint nearly twice the 
length of the last 2 combined; 3rd and 4th pairs of moderate size and scarcely 
spinulous. Uropoda with the outer ramus about half the length of the stem, 
inner ramus somewhat shorter, and armed inside with about 8 spinules (4 on 
the 1st, 2 on each of the last 2 joints), apical spine, as usual, strong, mucro- 
nate, not defined at the base. Telson extending as far as the stem of the uropoda, 
proximal thickened part occupying about y 3 of the length, distal part rather 
narrow, and armed on each side with about 8 spinules, apical spinules of about 
the same appearance as the lateral. Colour reddish brown. Length 10 mm. 
Adult male much more slender than the female, with the anterior division 
of the body less strongly arcuate above. Carapace, as usual, less deep and more 
tumid in its anterior part, exhibiting, however, the very same sculpture as in 
the female; pseudorostral projection shorter and more obtuse. Last pedigerous 
segment with the lateral corners very little produced, though clothed with the 
usual plumose setae. Tail unarmed. Inferior antennae remarkably short, scarcely 
exceeding in length the anterior division of the body; the other appendages 
transformed in the usual manner. Length 11 mm. 
Remarks. — According to Dr. Stuxberg, the species generally known as 
Diastylis (Cuma) Edwardsii Ivroyer is without any doubt identical with the form 
recorded by Lepechin as early as in the year 1778 as Oniscus scorpioides, and 
the specific name proposed by that author ought accordingly to be retained for 
this species. The Cuma brevirostris of Ivroyer is unquestionably the adult male 
of this species. It is an easily recognizable form, being at once distinguished 
from the other northern species by the peculiar sculpture of the carapace, which 
is equally distinct in both sexes. The shortness of the inferior antennae in the adult 
male is a unique character as regards the species of the present genus. 
Occurrence . — I have found this form rather abundantly in several places 
on the Finmark coast, as also off the Lofoten Islands. During the Norwegian 
North Atlantic Expedition it was also taken in the inner part of the Saltenfjord; 
but it has not yet been observed outside the polar circle. 
