60 GASTROCOPTA, NORTH AMERICA, WEST INDIES. 



The continental rupicola is an albinistic race, the insular 

 marginalia being more normal for the group in color. 



Before 1890, this species was thought to include G. procera 

 Old., and the name was so used in the writings of W. G. Bin- 

 ney and others. Gould, and afterwards Sterki, pointed out 

 the differential characters. 



G. rupicola matacumbensis n. subsp. PI. 14, figs. 1, 2, 3. 



The shell is fragile, milk-white, without a crest behind the 

 reflected lip; the latter being only slightly or moderately 

 thickened, very much less than in typical rupicola. There is 

 a callous below the inner end of the columellar lamella. All 

 of the teeth are somewhat smaller than in rupicola. 



Length 2.5, diam. 1.1 mm. (type). 



Length 2.35, diam. 1.1 mm. 



Length 1.85, diam. 0.93 mm. 



Lower Matacumbe Key, Florida, near the water-tank (Geo. 

 H. Clapp). 



Some dwarf specimens from the same place are less than 

 2 mm. long, with the aperture relatively larger (pi. 14, fig. 3). 

 It was taken in abundance by Mr. Clapp. The lip is thicker 

 than in G. servilis, which has not been found in Florida. 



17&. G. rupicola duplex n. subsp. PI. 11, figs. 4, 7, 9. 



The shell is similar in shape and size to the typical form, 

 but cinnamon-colored, having the lip white and not greatly 

 thickened. The columellar lamella is heavily calloused above 

 and below, the lower callous more or less distinctly tuberculi- 

 form (fig. 7). 



Bermuda: Bailey's Bay and other localities. Type and 

 paratypes no. 105797 A. N. S. P., from above Whitby Cave. 



17c. G. rupicola marginalba (Pfeiffer). PL 11, figs. 10 to 



13; pi. 10, figs. 6, 8, 9. 



The shell is cinnamon-colored, form convexly- tapering ; a 

 crest (sometimes weak) behind the lip. Lip-callous heavy, 

 also cinnamon-colored. Angulo-parietal lamella more dis- 

 tinctly bifid in front view than that of typical rupicola; and 

 typically the front end of the parietal lamella projects more 



