292 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



The type, U.S.N.M. no. 468916, is a complete specimen having 6.5 

 whorls. It measures : Length, 21.4 nmi ; greater diameter, 13.3 mm ; 

 lesser diameter, 10.0 mm. 



CHONDROTHYRETES RETICULATA SCROBICULA, new subspecies 



Plate 21, Figure 3 



This race comes from a small mogote known as Hoyos de San 

 Antonio Asiento de la Jagiia. It is a small race, orange in color, 

 with white denticulations at the summit and the spaces between these 

 brown. The peristome is slightly rayed on the back. There is also 

 a feeble dark axial zone behind the peristome. 



The type, U.S.N.M. no. 468914, has 5.0 whorls remaining and 

 measures : Length, 20.4 mm ; greater diameter, 12.8 mm ; lesser diam- 

 eter, 10.2 mm. 



CHONDROTHYRETES RETICULATA PETRICOLELLA, new subspecies 



Plate 20, Figure 5 



Under this name we shall combine the small shells occupying the 

 Mogotes Piedra Laguna, as well as those that border the road from 

 Vinalcs to the Puerta del Ancon. In the main this race resembles 

 C. r. fetncola^ but it is very variable in color, ranging in ground 

 color from flesh-color to pale brown, with the base frequently banded 

 and the rest of the shell marked by fine spiral lines, which are also 

 frequently arranged in axial series. 



The type, U.S.N.M. no. 468908, comes from Fogon de los Negros 

 from the northern part of the La^;una Piedras. It is a complete 

 specimen having 7.0 whorls and measuring : Length, 20.2 mm ; greater 

 diameter, 12.4 mm ; lesser diameter, S.T mm. 



CHONDROTHYRETES RETICULATA FRATERCULA, new subspecies 



Platej 20, Figure 8 



This race occupies the small mogotes between Vinales and the dos 

 Hermanos, etc., including Mogote Vigil and Mogote la Feita. 



The shells vary from pale chestnut-brown to sooty brown, with the 

 peristome white on both sides. The dark forms seem conspicuously 

 marked by the slender denticulated white line at the summit. 



The type, U.S.N.M. no. 492893, comes from the Mogote la Feita. 

 It has 3.6 whorls remaining and measures : Length, 17.6 mm ; greater 

 diameter, 12.8 mm; lesser diameter, 9.1 mm. 



