322 PROCEEDINGS OF THE NATIONAL INIUSEUM vol. 85 



CHONDROTHYRELLA (CHONDROTHYRELLA) PETRICOSA PETRICOSA (Morelct) 



Plate 26, Fku^rk 2 



1851. Cyvlostonni petrirosum Morelkt, Testacea novis^ima iusulae Cuhanae et 

 Americae Centralis, pt. 2, pp. 19-20. 



This subspecies, which was described b}^ Morelet from Ahnendares, 

 is characterized by its enfeebled sculpture, which gives it a worn 

 aspect. The color of it varies throughout the range of the species, 

 and it is also quite variable in size. It ranges westward to the 

 Sierra Anafe and Guanjay. 



The specimen figured, U.S.N.M. no. 402995, is a topotype from 

 Ahnendares. It has 4.5 whorls remaining and measures: Length, 

 14.5 mm; greater diameter, 9.8 mm; lesser diameter, 6.9 mm. 



CHONDROTHYRELLA (CHONDROTHYRELLA) PETRICOSA EUSABETHAE, new 



subspecies 



Plate 26, Figure 3 



This subspecies possesses a much stronger and rougher sculpture 

 than the typical form and is almost black in coloration, with strong 

 radiating i-ays on the outer peristome. 



The type, U.S.N.M. no. 499596, was collected by Dr. Aguayo on the 

 Ariguanabo River. It has 4.3 whorls remaining and measures: 

 Length, 12.8 mm; greater diameter, 9.0 mm; lesser diameter, 6.8 

 mm. 



"We have also seen this race from San Antonio and Santiago de 

 las Vegas and the region about Chorrera. 



CHONDROTHYRELLA (CHONDROTHYRELLA) PETRICOSA ANAFENSIS, new subspecies 



Plate 26, Figuke 1 



On the summit of the Anafe hills we find a form that, while be- 

 longing to this species, differs materially from typical C. {C.) petrl- 

 cosa^ which is found at the base of the hills, in having the sculpture 

 ever so much stronger and in this respect resembling C. (C) pefii- 

 cosa elisabethae. 



The type, U.S.N.M. no. 493001, comes from the summit of Sierra 

 Anafe and has 4.5 whorls remaining. It measures: Length, 15.0 

 nun; greater diameter, 9.4 mm; lesser diameter, 6.5 mm. 



Genus CHONDROPOMA Pfeiffer 



1S47. Chondropoma Peeiffek, Zeitschr. Malak., vol. 6, p. 109. 



Shell ranging in form from turbinate to elongate-conic; the sculp- 

 ture in varying intensity may consist of axial ribs only or of axial 



