398 PROCEEDIXGS OF THE NATIONAL MUSEUM vol. 85 



luterrupted spiral bands of brown not strong. 



Interrupted spiral bands of brown of medium strength. 



Tubercles on last whorl very sti'ong clerchi 



Tubercles on last whorl only moderately strong. 

 Tubercles of penultimate whorl very strong. 



Decollated shell more than 17 mm leteranense 



Decollated shell less than 14 mm fomentense 



Tubercles of penultimate whorl not very strong. 

 Decollated shell elongate-ovate. 



Decollated shell more than 18 mm violaceum. 



Decollated shell less than 15 mm tenue 



Decollated shell ovate. 



Spacing of axial ribs very regular manatiense 



Spacing of axial ribs not very regular sopimpense 



Interrupted spiral bands of brown feeble. 



Tubercles rather coarse rocai 



Tubercles not coarse maguasense 



Interrupted spiral bauds of brown not feeble. 



luterrupted spiral bands of brown obsolete or absent. 

 Decollated shell elongate-ovate. 



Decollated shell more than 20 mm long banaoense 



Decollated shell less than 15 mm long ignotum 



Decollated shell not elongate-ovate. 

 Decollated shell ovate. 



Open umbilicus narrow. 



Length of decollated shell more than 20 mm_ gonzalesi 

 Length of decollated shell less than 17 mm. 



Sculpture very fine atkinsi 



Sculpture less fine serranum 



Open umbilicus very wide. 



Sculpture rough doloresi 



Sculpture fine saugeti 



CHONDROTHYRIUM VIOLACEUM GONZALESI, new subspecies 



Plate 28, Figure 17 



This race, which is probably the h\rgest of the species, we have 

 from Jagiia Cienfuegos. The interrupted spiral bands are absent 

 and the umbilicus is narrow; outer lip broadly expanded. 



The type, U.S.N.M. no. 367820, has 4.2 whorls remaining and 

 measures: Length, 20.6 mm; greater diameter, 13.7 mm; lesser 

 diameter, 11.3 mm. 



CHONDROTHYRIUM VIOLACEUM SERRANUM, new subspecies 



Plate 28, Figure 14 



This race comes from Naranga Dulce, La Sierra, southeast of 

 Cienfuegos. It resembles C . v. atkinsi in the absence of interrupted 

 spiral bands but has finer tuberculation and is smaller. 



