58 
crowded spinules continued along the side of the pseudorostral projection, lateral 
faces otherwise nearly smooth, with only very slight traces of the polygonal 
areas found in the female. Exposed part of trunk with the dorsal spines less 
distinct than in female. Caudal segments partly denticulate also on the ventral 
face. The several appendages transformed in the usual manner. Length 11 mm. 
Remarks .—This form was first described by Sp. Bate in the year 1865 
from Shetland specimens, and was subsequently found by the present author also 
off the Norwegian coast. It is an easily recognizable species, being markedly dis¬ 
tinguished by the elegant manner in which the spiny armature of the carapace 
is arranged. 
Occurrence .—Though occurring nowhere in any considerable number, this 
form seems to be distributed along the whole south and west coasts of Norway, 
from the Christiania Fjord to Hasvig in West Finmark. It is, however, a very 
pronounced deep-water form, being only found in greater depths ranging from 
100 to 400 fathoms. Of the adult male, I have as yet seen only 2 specimens, 
one of which is figured on the accompanying plate. 
Distribution .—Shetland Isles (Sp. Bate), off the Skagen Lighthouse (Meinert), 
Stat. 9 of the Lightning Expedition (Norman), Stats 31 & 124 of the Norwegian 
North Atlantic Expedition (the present author). 
10. Diastylis scorpioides (Lepechin). 
(PI. XLIV.) 
Oniscus scorpioides , Lepechin, Acta Petropol. 1778. Yol. I. 
Syn: Cuma Edwardsii, Kroyer. 
„ Cuma brevirostris , Kroyer (adult male). 
„ Diastylis Edwardsii (auctorum). 
Specific Characters. — Female. Body comparatively robust, with the 
anterior division of ovoid form and boldly arched dorsally. Carapace of moderate 
size, with the dorsal margin considerably sloping in front, surface without any 
spines, but sculptured on each side with 5 rather conspicuous, obliquely trans¬ 
verse plicae minutely crenulated at the edge, the 2 anterior rather short and 
curved anteriorly, the 3 succeeding ones extending throughout the whole depth 
of the carapace from the most prominent part of the branchial region to the 
anterior part of the lower edge, where they unite; hind edge of carapace like¬ 
wise elevated in the form of a crenulated plica; pseudorostral projection rather 
short, conical, horizontal; subrostral corners very slight. Exposed segments of 
trunk with the anterior edge more or less distinctly elevated and finely crenulated, 
