CUBAN SUBFAMILY CHONDKOPOjMINAE TORRE AND BAKTSCH 279 



true on the base. The peristome is only faintly radiately rayed. Here 

 both the axial and spiral threads become somewhat reduced on the 

 last whorl. The reflected outer peristome leaves an open gap at the 

 umbilicus. 



This subspecies comes from the mogote southwest of Kilometer 

 14, between Pinar del Rio and Vinales. 



The type, U.S.N.M. no. 492731, is a perfect specimen, having 6.5 

 whorls, and measures: Length, 19.2 mm; greater diameter, ll.Y mm; 

 lesser diameter, 8.2 mm. 



CHONDROTHY'RETES IMPRESSA PEREGRINA, new subspecies 



Plate IS, FiGUiiE 4 



This small race, vrhich represents the easternmost member of the 

 hnqiressa complex, was collected by Arango at Loma de Candelaria, 

 Pinar del Rio Province. 



It resembles (J . hnpi'essa hyam in size but has the whorls a little 

 more inflated. It also lacks the narrow umbilical slit. 



The type, U.S.N.M. no. 367890, is a complete specimen having 6.4 

 whorls and measures: Length, 17.8 mm; greater diameter, 11.0 mm; 

 lesser diameter, 8.2 mm. 



CHONDROTHYRETES IMPRESSA ALBOSTOMA, new subspecies 



Plate IS, Figure 6 



This race comes from the smaller mogote of the Cayo San Felipe, 

 It has the early whorls regularly interruptedly^ spirally banded with 

 brown. On the last whorls these markings become broader and more 

 or less axially confluent. The peristome is white. The sculpture of 

 the last whorl is also somewhat less developed than on the preceding 

 turns. 



The type, U.S.N.M. no. 468742, is a perfect specimen, having 6.5 

 whorls and measures : Length, 21.4 mm ; greater diameter, 13.5 mm ; 

 lesser diameter, 9.3 mm. 



CHONDROTHYRETES IMPRESSA ROSARIENSIS, new subspecies 



Plate 18, Figure 5 



This race was collected by Cisnero, at San Cristobal in the Sierra 

 El Rosario. It, like C. imqn^essa alhostoma^ is white-lipped, but dif- 

 fers from that subspecies by lacking the numerous interrupted spiral 

 lines and strong varicial streaks. 



The type, U.S.N.M. no. 367887, has 4.0 whorls remaining and meas- 

 ures: Length, 17.3 mm; greater diameter, 11.8 mm; lesser diameter, 

 8.5 mm. 



