^°l89ay''] PROCEEDINGS OF THE NATIONAL MUSEUM. 407 



ALBERS' LIST.* 



(Jiuler the generic title of Neaiotes^ Albers included all of the Gala- 

 pagos Bulinii known at the time, with the exception of Forbes's aclia- 

 tinelli II IIS iiml chemnitzioides. Albers first used the name TV rrsio/M6 in 

 1H50, afterwards as revised, Nesiotes in L860; the latter has since been 

 used in (Joleoptera and Hemiptera by various entomological writers. 

 Schliitter's Omphalostyla (1838) is probably not tlie same group as the 

 Galapagos shells. 



1. uux Brod. 



2. nuciforniis I'etit. 



3. sciilptuiatus Plr. 



4. asperatns Albers 



5. iiicrassatus Pi'r. 



6. Darwiui Pfr. 



7. imifasciatus Sby. 



8. ustiilatns Sby. 



9. galapaganus Pfr. 



10. Jacob! Sby. 



11. micuUi Pfr. 



12. calviis Sby. 



13. riigiferiis Sby. 



14. escluiri ferns Sby. 



15. rugnlosiis Sby, 



Of Albers' list of fifteen as above, four, namely, viueiformis, asperatus, 

 iiicrassatus, and nucula, should be regarded as varieties or synonyms of 

 nu.v. Pft^iifer's section Rhaph'uilns of Ehrenherg's genus Buliminus is 

 based upon Vovhii^''s, BuUmus achatinelUims] and iucludesonly this soli- 

 tary species. 



It would seem that geographical considerations would cause oiie to 

 hesitate before placing any Galapagos form in Ehrenberg's genus. In 

 the light of to-day, it is an interesting illustration of or commentary on 

 the extreme systematization, to which the pulmonata-geophila, all the 

 world over, have been subjected. 



The relations of achaUnellinus to the other Galapagos forms can not 

 be satisfactorily determined until a larger series has been collected 

 and examined, and the peculiarities of station and habits have been 

 observed. 



As to generic or subgeneric titles, one may well ask why Fleuvopyrgus 

 for the Galapagos forms, like Forbes's chemnitzioides^ when we have 

 Pyrgus turritiis Brod. (Ueeve, 124) from "Truxillo, Peru," before us. 



It is highly i)robablc that the well characterized insular groups of 

 Bulimoids, Achatinclla and Partnla of the Sandwich and Society islands, 

 respectively, influenced authors to the extent of causing them to regard 

 the Galapagos forms as an analogous group worthy to be known by a 

 distinguishing name. 



THE PETREL-COOKSON SHELLS. 



Commander Cookson, in command of H. M. S. Petrel, visited Charles, 

 Abingdon, and Albemarle islands in June, 1875. The shells collected 

 by him were determined by Mr. E. A. Smith, of the British Museum, 



* Von Marten's Albers' Die Heliceen, etc., Leipzig, 1860, Ed. ii. 

 tProc. Zool. Soc, London, 1850, p. 56. 



