CUBAN SUBFAMILY CHONDROPOMINAE TORKE AND BARTSCH 263 



This race comes from Mogote del Canalete, south of the Sierra San 

 Andres. 



The type, U.S.N.M. no. 468697, has 4.5 whorls remaining and meas- 

 ures: Length, 21.6 mm; greater diameter, 14.2 mm; lesser diameter, 

 9.9 mm. 



Plicathyra, new subgenus 



Shell similar to Chondrothi/ra as far as general shape and sculpture 

 are concerned, differing markedly from this, however, by having the 

 outer peristome of the inner lip so bent as to form a fold. 



Type: Chondrothyra {Plicathyra) unipUcata^ new species. 



KEY TO THE SPECIES OF SUBGENUS PLICATHYRA 



Shell elongate-ovate. 



Shell dark and rather heavy. 



Sculpture of last whorl strong uniplicata 



Sculpture of last whorl feeble crassa 



Shell pale and rather thin wrighti 



CHONDROTHYRA (PLICATHYRA) UNIPLICATA, new species 

 Plate 16, Figure 6 



Shell large, elongate-ovate, rather thin. Nuclear wdiorls buff. Post- 

 nuclear whorls chestnut-brown, except the peristome and the margin 

 of the lip, which are white. Nuclear whorls 2, strongly rounded, 

 smooth except for microscopic granules and the beginning of the spi- 

 ral threads on the last portion of the last whorl. Postnuclear whorls 

 inflated, strongly rounded, marked by spiral threads and retractively 

 curved axial riblets, which become a little weaker and more closely 

 spaced as the shell increases in size. The junctions of these two ele- 

 ments form small nodules, which are strongest on the middle whorls, 

 while the spaces enclosed between them are squarish on the early 

 whorls and oblong on the last whorl where their long axis coincides 

 with the axial sculpture. The summit of the whorls is appressed and 

 usually shows as a pale line. Periphery and base inflated, well 

 rounded. On the latter the axial and spiral sculpture are both 

 stronger than on the spire. The base is half openly umbilicated. 

 Aperture broadly oval, slightly angulated posteriorly. Peristome 

 double, the outer broadly expanded, somewhat channeled at the pos- 

 terior angle, more than double the width of that of the outer lip on 

 the posterior half of the inner lip, somewhat radially fluted and 

 marked with strongly developed, wavy, concentric lamellae. The 

 middle of the outer peristome of the inner lip is bent by a partial 

 fold. Inner peristome somewhat exserted and slightly expanded. 

 Operculum thin, corneous, covered with a heavy deposit of calcareous 

 granules, which extend to its edge. 



