CUBAN SUBFAMILY CHONDROPOIMINAE TORRE AND BARTSCH 309 



CHONDROTHYRELLA (PLICATHYRELLA) ASSIMILIS MACEOI, new subspecies 



Plate 25, Figure 2 



This race comes from Cacarajicara, 2 miles west of Rancho Lucas. 

 It has the early postnuclear whorls distantly ribbed and the peristome 

 radiatingly rayed with chestnut-brown ; there is also a spot of the 

 same color at the notch of the inner lip. The interrupted spiral 

 bands of brown are narrow and faint on the spire but broader and 

 a little more pronounced on the periphery and base. The spiral 

 threads on the anterior half of the base are very strong, which will 

 help to differentiate this easily from C. (P.) assimAUs signata. 



The type, U.S.N.M. no. 468743, has 4.5 whorls remaining and 

 measures: Length, 15.0 mm; greater diameter, 12.5 mm; lesser di- 

 ameter, 8.2 mm. 



CHONDROTHYRELLA (PLICATHYRELLA) ASSIMILIS SIGNATA, new subspecies 



Plate 25, Figure 7 



This subspecies comes from the Sierra Chica south of Pan de 

 Guajaibon. It differs from typical C. (P.) asshmlis asdmilis in 

 having the jDeristome radiatingly rayed, and in having a faint dark 

 line at the edge of the summit of the whorls, and from C. {P.) 

 assimilis maeeoi in having the spiral cords about the umbilicus much 

 less strongly developed. The decidedly inflated whorls are distantly 

 ribbed on the early turns, but here the ribs closely approximate on 

 the last whorl where the spaces that separate them are almost as 

 narrow as the ribs, which are sublamellar and low. The interrupted 

 spiral bands are almost continuous. The peristome of the inner lip 

 is very broad and the flexure not profound. 



The type, U.S.N.M. no. 468744, has a little more than 4 whorls 

 remaining and measures: Length, 15.6 mm; greater diameter, 12.0 

 mm ; lesser diameter, 8.3 mm. 



CHONDROTHYRELLA (PLICATHYRELLA) ASSIMILIS ASSIMILIS (Gundlach) Pfeiffer 



Plate 25, Figure 1 



1863. Cho)idropnma assimiJe (Gundlach Pfeiffek, Malakozool. Blatter, vol. 



10, p. 186. 

 1920. Chondrothyra (Chondrothyretes) assimile Henderson and Bartsch, Proc. 



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



This subspecies comes from San Juan de Sagua, the southwest side 

 of Pan de Guajaibon. It has the early postnuclear whorls rather 

 distantly ribbed; the peristome is pale yellowish, without brown 

 radiating rays. It also has the spiral threads on the anterior half of 



