278 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



CHONDROTHYRETES IMPRESSA SOLACIA, new subspecies 



Plate 18, Figure 3 



This subspecies was collected by Natenson on ISIogote de Quilla, 

 Eiitronqiie de Herradiira. 



It resembles C . hnpressa ornata but has the interrupted brown 

 spiral lines extending over the entire surface of the shell. From 

 C. hnpressa impressa it is distinguished by having the spiral lines 

 of brown much broader. 



The type, U.S.N.M. no. 468936, a complete specimen, has 7.5 whorls 

 and measures: Length, 20.0 mm; greater diameter, 11.6 mm; lesser 

 diameter, 8.8 mm. 



CHONDROTHYRETES IMPRESSA IMPRESSA, new subspecies 



Plate 18, Figure 11 



In this race, Avhich comes from the Cantera nortli of Consolacion 

 del Sur, the shell is small and marked near the summit by one broad 

 and between this and the periphery by 4 narrow interrupted spiral 

 zones of chestnut -brown; another similar zone marks the periphery, 

 while 5 more are present on the base. The outer peristome is fairly 

 strongly rayed. The posterior half of the outer peristome of the 

 inner lip is deeply inbent, plugging the umbilicus, but usually leav- 

 ing a narroAv chink open. 



The type, U.S.N.M. no. 468740, a perfect specimen, has 6.9 whorls 

 and measures: Length, 19.3 mm; greater diameter, 11.5 mm; lesser 

 diameter, 8.1 mm. 



CHONDROTHYRETES IMPRESSA GUAMENSIS, new subspecies 



Plate 18, Figure 10 



This large race was collected by Palmer and Kiley at El Guama 

 a little west of Pinar del Rio. 



Its large size, combined with the faint rays of the outer peristome, 

 easily differentiates it from the other known large C. impressa 

 gigantea. 



The type, U.S.N.M. no. 169928, has 4.2 whorls remaining, which 

 measure : Length, 23.8 mm ; greater diameter, 15.5 mm ; lesser diam- 

 eter, 11.5 mm, 



CHONDROTHYRETES IMPRESSA HYANS, new subspecies 

 Plate IS, Figure 1 



In this small race tlie interrupted spiral color markings consist of 

 irregular blotches that are frequently confluent; especially is this 



