^GA. 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 ^' localite 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. 



* Althougli unquestionably this is the On. psora of Pennant, it is doubtful 

 whether it be identical with the species so named by previous authors. 



