CUBAN SUBFAMILY CHONDROPOIMIKAE TORRE AND BARTSCH 227 



Nuclear whorls about 1.5, inflated, strongly rounded, continuing the 

 outline of the postnuclear spire in their coiling. Postnuclear whorls 

 strongly inflated and separated by a strongly impressed suture and 

 marked on the early wliorls by very strong lamellar, retractively 

 slanting, axial riblets, which become a little more closely spaced on 

 the last turn. "Umbilical wall marked by rather distantly spaced 

 spiral threads which here render the axial riblets somewhat serrulate. 

 Peristome double, the outer broadly expanded, marked by concentric 

 lamellae. Operculum white, multispiral, the inner four-fifths of 

 the whorls covered with a heavy callus, which is laid down in a 

 somewhat fluted manner, the thickenings curved retractively. 



The animal of C. {C.) segregatum is flesh-color with a smoky 

 suffusion, the tip of the snout a little paler than the rest. Tentacles 

 smoky gray, a little paler at the tip. Sole of foot flesh-color with 

 pale smoky suffusion. The sole of the foot is medially longitudinally 

 cleft, the locomotory waves being alternate. 



The subspecies of this species are widely scattered among mogotes 

 lying east and south of the Organ Mountains and about or west of 

 the road that leads from Pinar del Rio to Vinales. The exception 

 to this is C. (O.) segregatum sporadlcmn from Mogote Quilla, Finca 

 el Descanso, Entronque de Herradura, which, in spite of its distance 

 from G. {C.) segregatum segregatum from the mogotes at Kilometer 

 14, is quite similar to this. 



This species is distinguished from the other small forms by its 

 strongly banded colored pattern and by the exceedingly strongly 

 developed lamellar ribs, which give the shell a rough surface. 



Distribution of the subspecies of C. (O.) segregatum is shown in 

 figure 79. 



KEY TO THE SUBSPECIES OF CHONDROPOMETES (CHONDROTHYROMA) 



SEGREGATUM 



Greater diameter more than 16 mm. 



Spiral bands strong felipense 



Spiral bands not strong. 

 Spiral bands feeble. 



Greater diameter more than 19 mm lagunitasense 



Greater diameter less than 17 mm arangoi 



Spiral bands absent vallei 



Greater diameter less than 15 mm. 



Spiral markings strong laureani 



Spiral markings not strong, sometimes absent. 



Umbilicus rather broad segregatum 



Umbilicus rather narrow. 



Shell yellow sporadicum 



Shell white mameyi 



