400 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



little more inflated than G. violaceum vigiaense and the axial and 

 spiral sculpture finer, more numerous and closer spaced. The dark 

 spiral bands are also a little lighter. 



The type, U.S.N.M. no. 3C7828, has a little more than three whorls 

 remaining, and measures: Length, 17.0 mm; greater diameter, 11.7 

 mm; lesser diameter, 9.7 mm. 



CHONDROTHYRIUM VIOLACEUM VIGIAENSE, new subspecies 



Plate 28, Figitre 1 



This race comes from La Vigia near Trinidad. The truncated 

 shell is of ovate outline and the coloration is very dark, tending 

 to purplish on the last turn. The elements composing the broad 

 interrupted spiral bands are arranged in axial series. The tips of 

 the tubercles are ■white and stand out markedly against the dark back- 

 ground. The outer lip is also decidedly expanded on all sides. For 

 comparison with C. violaceum montanei^ see the diagnosis of that 

 subspecies. 



The type, U.S.N.M. no. 493282, has a little more than four whorls 

 remaining and measures: Length, 18.8 mm; greater diameter, 12.5 

 mm ; lesser diameter, 10.1 mm. 



CHONDROTHYRIUM VIOLACEUM LETERANENSE, new species 



Plate 28, Figure 2 



This race comes from San Juan de Leteran. Here the shell is 

 elongate-conic and the tubercles on both the last and penultimate 

 whorls are decidedly strong, in which respect it resembles C. viola- 

 ceuni fomenteiwe^ from which its larger size and more elongate form 

 will readily distinguish it. The ground color is buff, and the inter- 

 rupted spiral bands of brown are only of medium strength. 



The type. U.S.N.JM. no. 367832, has 5 whorls remaining and meas- 

 ures: Length, 17.8 mm; greater diameter, 11.4 mm; lesser diameter, 

 8.3 mm. 



CHONDROTHYRIUM VIOLACEUM MAGUASENSE, new subspecies 



Plate 28, Figitre 7 



This race comes from the ISIagua Valley of Trinidad. It is a 

 small pale race with feeble interrupted spiral bands of brown, in 

 which respect it resembles C. violaceum rocai^ from which it differs 

 by its much finer tubercles and less inflated whorls. 



The type, U.S.N.M. no. 367824, has 4 whorls remaining and meas- 

 ures: Length, 11.3 mm; greater diameter, 7.8 mm; lesser diameter, 

 6.2 mm. 



