ISOPODS OF NORTH AMERICA. 333 



"It is closely allied to Arcturas anna and to Arcturiis cormitus^ 

 but differs sufficiently from both to constitute the type of a new 

 species. 



Fig. 3fi4.— Arcturus purpureus (After Beddard). Dorsal view. 



"The extreme lenoth of the specimen, which is a female, is 18 mm., 

 the lenoth of the antenni^ 31 mm. 



