314 PROCEEDINGS OF THE NATIONAL MUSEUM tol. 85 



CHONDROTHYRELLA (PUCATHYRELLA) TENEBROSA TENEBROSA (Morclet) 



Plate 27, F^gube 3 



1849. Cyclostoma tenehrosum Mobelet, Testacea novissima insulae Cubanae et 



Americae Centralis, pp. 23-24. 

 1S52. Chondropoma tenebrosntn Pfeiffeb, Monographia pneumonopomorum vi- 



ventium, vol. 1, pp. 295-296. 

 1920. Chondrothyra (Chondroihyretes) tenehrosa Hendebson and Baktsoh, 



Proc. U. S. Nat. Mus., vol. 58, p. 64. 



This subspecies comes from Rancho Lucas on the northeast side of 

 Pan de Guajaibon. It has the peristome and callus of the parietal 

 wall chestnut-brown. 



The specimen figured, U.S.N.M. no. 11026, was collected by Wright; 

 it has 4.5 whorls remaining and measures : Length, 16.5 mm ; greater 

 diameter, 13.0 mm ; lesser diameter, 18.9 mm. 



CHONDROTHYRELLA (PLICATHYRELLA) TENEBROSA CAIMITENSIS, new snbspeciea 



Plate 27, Figube 5 



In this race, from Caimito, southwest of Pan de Guajaibon, the 

 peristome is yellow, with a brownish wash. The part of the outer 

 peristome on the inner lip posterior to the fold is definitely pale 

 chestnut-brown; the rest is rayed with radiating zones of brown. 



The type, U.S.N.M. no. 11003, was also collected by Wright. It 

 has 4.3 whorls remaining and measures: Length, 14.9 mm; greater 

 diameter, 12.2 mm; lesser diameter, 7.8 mm. 



CHONDROTHYRELLA (PLICATHYRELLA) TENEBROSA SUBTENEBROSA, new subspecies 



Plate 27, Figure 1 



This subspecies was collected by Wright at Pinalillo, Sitio del 

 Pinar, north-central part of Pan de Guajaibon. It has the peristome 

 pale yellow, without radiating rays. 



The type, U.S.N.M. no. 367885, has 4.5 whorls remaining and 

 measures: Length, 16.1 mm; greater diameter, 12.8 mm; lesser 

 diameter, 8.2 mm. 



CHONDROTHYRELLA, new subgenus 



Chondrothyrella with the umbilicus closed by the reflected inner 

 lip of the outer peristome. The breathing pore connects with the 

 umbilicus by a slender space in the parietal callus; the breathing is 

 accomplished through the hollow axis and the decollated apex. 



Type: Chondrothyrella {Chondrothyrella) pudica (Orbigny). 



