THE CYCIiOPHO'RlD LAA^D MOLLUSKS OF AMEKTCA 151 



ADELOPOMA OCCIDENTALE (Guppy) 



Plate 40, Figure 6 



We have described this species from Trinidad (p. 52) . 



Specimens indistinguishable from it were obtained by the Bond 

 Venezuelan Expedition of the Academy of Natural Sciences of Phila- 

 delphia in 1911, at Cariaquita, Venezuela. They are registered as 

 A.N.S.R No. 105193 and U.S.N.M. No. 536008. 



Cariaquita is not far from the Island of Trinidad, and it is not 

 surprising that the species should extend to this locality. 



Subfamily Amphicyclotinae Kobelt and Mollendorff 

 For the characters of this subfamily, refer to p. 52. 



KEY TO THE GENERA OF THE SUBFAMILY AMPHICYCLOTINAE 



Spiral sculpture strong. 



Shell discoid Buckleyia 



Shell not discoid. 

 Shell helicoid. 



Shell with a notch at base of columella Lagocyclus 



Shell without a notch at base of columella. 



Shell with two spiral keels on umbilical wall Filocyclus 



Shell without spiral keels on umbilical wall— Calaperostoma 

 Spiral sculpture absent or obsolete. 



Peristome reflected Cyrtotoma 



Peristome not reflected. 



Posterior angle of aperture with a strong keel Barbacyclus 



Posterior angle of aperture without a strong keel. 



Shell smooth Calacyclotus 



Shell not smooth but with axial sculpture only. 

 Axial sculpture not vermiculated. 



Axial sculpture vertical Mexcyclotus 



Axial sculpture retractive Megacyclotus 



Axial sculpture vermiculated Amphicyclotus 



Genus BUCKLEYIA Higgins 



1872. Biickleyia Higgins, Proc. Zool. Soc. London, 1872, p. 86. 



1873. Buckleya Mousson, Malak. Blatter, vol. 21, p. 17. 



Amphicyclotine shells of a discoid shape, having the upper and 

 lower side almost identical in all features. Operculum with the edge 

 of the outer turns upturned as flakelike elements. 



Type: Aperostotna {Buckleyia) montezumi 'H.iggms= Buckleyia 

 martinezi (Hidalgo). 



Distribution: Colombia and Ecuador. 



KEY TO THE SPECIES OF BUCKLEYIA 



Spiral keels 2 bicincta 



Spiral keels 4. 



Spiral keels strong martinezi 



Spiral keels weak bifasciata 



