No. 10 GARTH : BRACHYURAN FAUNA OF THE GALAPAGOS 343 



to the U. S. National Museum. For this reason it has not been possible 

 to assign permanent catalogue numbers to the collection beyond the 

 Oxystomata. 



The major problem in any Galapagos brachyuran fauna is how best 

 to treat the 17 species collected by Cuming circa 1829 and reported upon 

 by Bell (1835-36) with types attributed to the Galapagos Islands. Few 

 of these have been collected there since, while practically all of them have 

 been turned up along the mainland coast of South America from Santa 

 Elena Bay, Ecuador, to the Bay of Panama, localities also visited by 

 Cuming. Ten of the 18 species herein recorded as occurring in Galapagos 

 waters but as not having been obtained there by Allan Hancock Expedi- 

 tions are Bell species which have not been found in the islands by any 

 collector subsequent to Cuming, if indeed he found them there. Eight of 

 the 10, however, have been obtained by Velero III collectors at mainland 

 or other insular stations. Since the writer's unpublished distributional 

 studies have shown that mainland species, whether Peruvian, Panamanian, 

 or Gulf of Californian, may occur sporadically in the Galapagos Islands, 

 it cannot be stated categorically that the 10 Bell species were not collected 

 in the archipelago, or that they may not be found there again. For this 

 reason they are included in the fauna, with emphasis upon the fact that 

 they have not been taken in Galapagos waters for 115 years. 



The same situation does not obtain in the case of the Miers and Milne 

 Edwards species, Leptodius cooksoni and Eriphia granulosa, or Mier's 

 Chilean records of Bell's species, Mithrax (Mithrax) bellii Gerstaecker 

 (name substituted for Mithrax ursus Bell) and Mithrax (Mithraculus) 

 nodosus. Here it is the early mainland record which lacks recent specimen 

 authentication, the species in question being othenvise Galapagos endemics. 



Six new species, one species not previously illustrated, one species not 

 recognizable from the existing illustration, one species known only from 

 the young, the adult of which is represented for the first time, and two 

 species known only from the female, the males of which are represented 

 for the first time, are illustrated in pen and ink drawings by Mr. Anker 

 Petersen, staff artist, Allan Hancock Foundation. The remaining species 

 obtained by Hancock or other recent expeditions in the Galapagos are 

 illustrated photographically. It has not been thought best, however, to 

 draw upon Hancock collections from the mainland for illustrations of 

 Galapagos species not obtained in the islands, since photographs of these 

 will undoubtedly be included in forthcoming accounts of collecting on 

 continental shores. 



The writer wishes to acknowledge his indebtedness to Captain Allan 

 Hancock, master of the Velero III and director of the expeditions, for 



