U. S. .NATIONAL MUSEUM 



BULLETIN 192 PLATE 21 



1 Colobostvlns iCohbostvloidcs) saxorum (Weinland) ; 2, Clydonopoma <^E"^'*°P°''f}J,Zi'} 

 (Pilsbry); 3, C. {Clydonopoma) nobile (Pfeiff^r) ; 4-6, Petasxpoma bombardopolense. 



new species. 



