be 
AGA PSORA. 285 
being given), it is omitted by Mr. A. White from his 
Catalogue of British Crustacea. Dr. Leach (the chief 
authority for Samouelle’s work), indeed, stated in his 
description of the species “‘localité inconnue’’ (a specimen 
has, however, since been received by the British Museum 
from Iceland, from Mr. Drewsen), so that, except for 
the unnecessary doubt expressed by Leach in his refe- 
rence to Pennant’s Oniscus psora,* there is no recorded 
authority for its insertion in the British list. We are 
enabled, however, to introduce it unquestionably on the 
faith of a fine specimen in the Bell collection (now at 
Oxford, obtained at Scarborough by Mr. Bean, by whom 
it was presented, with other interesting species from 
that locality, to Professor Bell). This specimen has 
supplied the figures at the head of this description. 
The Hope collection also possesses a specimen from 
Nova Scotia, and we have received it recently from 
Mr. Gregor, who dredged it in the Moray Frith. 
* Although unquestionably this is the On. psora of Pennant, it is doubtful 
whether it be identical with the species so named by previous authors. 
