34 Unnersity of Michigan 



JJ. Larger. 



K. More depressed; color castaneous. Bugaba, South Panama. 

 15; 133(20) Cyclotiis dysoiii, var. affiiiis .Mart. (1890). 



KK. ^lore depressed; growth lines more regular. Soledad, ]\Iexico. 

 16; 144(23) Cyclotiis dysoni, var. amhigiins Mart. (1890). 



KKK. Everything else. Honduras. 21.3; 125(26.5); 4'/^ 



Cyclostoiiia dysoiii Pfr. (1851). 



Poteria translucida bejumensis, new subsi^ecies 

 Figs. v-D, E, F, G. 



Thirty-three adults and 50 immature specimens from rock- 

 talus on ledge near top of small, rock wall of canon-like valley 

 of Banco Largo, near Bejuma, Venezuela (H, I, b, 7) ; and i 

 adult (the largest) from leached-out, root humus near top of 

 Cerro Chiriguara ( H. I. c, 15). 



Shell: heavier and more turl:>inate than P. t. translucida ; 

 growth lines prominent, but fine, regular and crowded. Color 

 of epidermis : unicolor, yellowish horn, apex lighter. Shell 

 substance: chalky, except near apex (usualh'' eroded), where 

 it is closer in texture and often tinged with rosaceous. Whorls : 

 a little less than 4^^ ; convex, quite rajMclly increasing in diam- 

 eter. Sutures : prominent, but not impressed. Aperture : al- 

 most vertical ; circular except for upper angle ; sometimes 

 l)riefly solute. Basal lip of peristome : with one or two emar- 

 ginations. Uml)ilicus : 1/7 of major diameter. 



The young shells, as is quite usual in the genus, are more 

 depressed than the adults. The females are slightly larger 

 than the males, and their average major diameter index is 

 slightly greater (more depressed shell), but the individual vari- 

 ation is so great that the sexes cannot be sej^arated by their 

 shape and size. 



Pfeififer's figure in the Conch. Cab. resembles this subspecies 

 more than it does the original figure of P. t. translucida. in the 



