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. Vol. I. 



Syn: Cuma Edwardsii, Ki-oyer. 



Cuma brevirostris, Kroyer (adult male). 

 Diastylis Edwardsii (anctoi-um). 



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 plica? 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, 



