CUBAN SUBFAMILY CHONDROPOMINAE — TORRE AND BARTSCH 277 

 KEY TO THE SUBSPECIES OF CHONDROTHYRETES IMPRESSA 



Peristome radiatingly rayed with brown. 

 Rays of outer peristome very decided. 



Greater diameter more than 14 mm gigantea 



Greater diameter less than 13 mm. 



Spiral color lines confined to posterior two-thirds of 



whorls between summit and suture ornata 



Spiral color lines not confined to posterior two-thirds 

 of whorls between summit and suture. 



Interrupted spiral lines of brown broad solacia 



Interrupted spiral lines of brown not broad impressa 



Rays of outer peristome not very decided. 



Greater diameter more than 15 mm guamensis 



Greater diameter less than 12 mm. 



Umbilicus with a narrow slit hyans 



Umbilicus without a narrow slit peregrina 



Peristome not radiatingly rayed albostoma 



Shell interruptedly spirally banded. 



Shell not interruptedly spirally banded rosariensis 



CHONDROTHYRETES IMPRESSA GIGANTEA, new subspecies 



Plate 18, Figure 12 



This large race comes from a mogote 2 kilometers west of Kilom- 

 eter 14, between Pinar del Rio and Vinales. 



The type, U.S.N.M. no. 468741, a complete specimen, has 6.8 

 whorls and measures : Length, 24.5 mm ; greater diameter, 15.4 mm ; 

 lesser diameter, 10.5 mm. 



Its large size, combined with the strong radiating rays of the outer 

 peristome, distinguishes it at once from all the other known sub- 

 species. 



CHONDROTHYRETES IMPRESSA ORNATA, new subspecies 

 Plate 18, Figure 2 



This subspecies was collected by Natenson on a mogote imme- 

 diately south of Perez Rivera's house, about one and one-half miles 

 south of the eastern end of the Sierra Guacamayas. 



It is a thin-shelled race brightly banded with interrupted dark 

 brown lines, which are confined to the posterior two-thirds of the 

 whorls between summit and suture. 



The type, U.S.N.M. no. 468938, has 4.2 whorls remaining and 

 measures: Length, 20.3 mm; greater diameter, 12.5 mm; lesser diam- 

 eter, 8.4 mm. 



