298 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



CHONDROTHYRETES CERINA POLITA, new subspecies 



Plate 23, Figure 2 



This race comes from the Sierra Martillo. It resembles typical 

 C . cenna cerina but has the sculpture of the last whorl reduced to 

 obsoleteness. 



The type, U.S.N.M. no. 468598, comes from Sitio del Martillo. It 

 has 4.5 whorls remaininf^ and measures: Length, 23.8 mm; greater 

 diameter, 15.5 mm; lesser diameter, 13.2 mm. 



CHONDROTHYRETES CERINA ROSEOAPICATA, new subspecies 



Plate 23, Figure 9 



In the high parts of tlie Sierra del Infierno and the Sierra Peni- 

 tencia we have a race with decidedly rosy tip. Here the dark, almost 

 sooty-brown, color of the rest of the shell prevails, the lighter phase 

 being less numerous. This, combined with the white peristome, ren- 

 ders this race very beautiful. 



The type, U.S.N.M. no. 4689G0, comes from the high parts of the 

 Sierra del Infierno, It has 5.4 whorls remaining and measures: 

 Length, 31.6 mm; greater diameter, 18.9 mm; lesser diameter, 16.3 

 mm. 



CHONDROTHYRETES CERINA PUELLA, new subspecies • 



Plate 23, Figure 5 



This subspecies is quite isolated from the main group and, as in 

 certain other forms occupying small offlying lumps of limestone, we 

 have here a diminutive race whose size at once distinguishes it from 

 the other members of the species. It comes from the Hoyo del 

 Guama, southeast of Santo Tomas. 



The type, U.S.N.M. no, 468964, a complete specimen, has 6.4 

 w^horls and measures: Length, 19.5 mm; greater diameter, 12.8 mm; 

 lesser diameter, 10.7 mm. 



CHONDROTHYRETES CERINA CERINA, new subspecies 



Plate 23, Figure 10 



This subspecies ranges through the lower reaches of the Sierra del 

 Infierno and the adjacent mogotes. 



It is quite variable in size, ranging from 24 to 30 mm in length. 

 In color it also ranges through everything except the roseoapicate 

 form. In sculpture it stands midway between C. cerina folita^ 

 which has the last whorl obsoletely marked, and G. cerina suhcerina^ 

 which is most strongly sculptured. 



The type, U.S.N.M. no. 367874, a large complete individual from 

 Sitio del Infierno, Sierro del Infierno, has 5.5 whorls and measures: 



