CUBAN SUBFAMILY CHONDKOPOMINAE TORRE AND BARTSCH 313 



fleeted. Operculum red or reddish, with excentric nucleus, covered 

 with a thick deposit of fine calcareous granules on all but the outer 

 edge. 



This species, while it resembles G. (P.) assitnilis, is easily distin- 

 guished from that by being almost globular in shape. 



Its races all cluster about Pan de Guajaibon. 



Figure 99. — Distribution of the subspecies of Chondrothyrella (Plicathyrella) teneirosa: 

 (1) tenebrosa; (2) suhtenebrosa; (3) caimitensis. 



Of the animal of G. (P.) tenebrosa tenebrosa, Gundlach says^: 

 "Animal with olive-gray head, neck gray, with Turk blue suffusion, 

 both with white dots which are especially marked about the eyes and 

 base of the tentacles. Foot gray. Tentacles ferruginous with white 

 dots. Eyes black." 



Distribution of the subspecies of G. (P.) tenebrosa is shown in 

 figure 99. 



KEY TO THE SUBSPECIES OF CHONDROTHYRELLA (PLICATHYRELLA) TENEBROSA 



Peristome and parietal callus chestnut-brown tenebrosa 



Peristome and parietal callus yellow with a brownish wash. 



Peristome radially rayed caimitensis 



Peristome not radially rayed , subtenebrosa 



■f Malakozool. Blatter, vol. 3, p. 135, 1863. 



