THE CYCLOPHORID LAND M0LLUSIK9 OF AMEIRIOA 7 



edge of the umbilicus. Aperture circular ; peristome expanded, thick- 

 ened, and double the width of that of the outer lip on the anterior 

 columellar wall and the adjacent basal area, and only about one-half 

 as wide on the posterior columella and parietal side. Operculum 

 typically farcimenid. The species appears restricted to Yunque de 

 Baracoa, Oriente Province. 



The type, U.S.N.M. No. 535888, was collected by Arango. It has 

 6.4 whorls and measures : Height, 17.8 mm. ; greater diameter, 9.6 mm. 



This species was listed as Megalomastoma seminudum by Pfeiffer, 

 Gundlach, and Arango. 



FARCIMEN (FARCIMEN) UNGULA (Poey) 



In this species the shell varies immensely in shape and color in the 

 different subspecies. The form may be elongate-ovate or elongate- 

 ovate-conic ; some individuals are comparatively slender ; others, obese. 

 Most of the specimens, having lost their periostracum, are soiled white 

 and they range from this through lemon yellow to rose red. The 

 periostracum is usually thin and translucent. It also varies from 

 wax color to pale wood brown. The umbilicus varies from open to 

 closed. Regardless of what the variance mentioned above may be, 

 the species has in common a thickened peristome, which is protracted 

 into a clawlike element at the junction of the outer and basal lip. 



This species is nearest related to F. (F.) pseudotortvm, from which 

 its ungulate peristome will readily differentiate it. 



The species appears confined to Oriente Province, where we are 

 recognizing nine subspecies, which the following key will help to 

 differentiate. 



KEY TO THE SUBSPECIES OF FARCIMEN (FARCIMEN) UNGULA 



Umbilicus open. 



Shell large, height more than 26 mm. 



Last whorl orange semivestitum 



Last whorl not orange holguinense 



Shell smaller, height 24 mm. or less perconvexum 



Umbilicus closed. 

 Shell very obese. 



Umbilicus bordered with a very conspicuous keel elephantinxim 



Umbilicus bordered with an obsolete keel mirandum 



Shell not very obese. 



Whorls well rounded. 



Lip decidedly protracted ungula 



Lip not decidedly protracted mayariense 



Whorls flattish. 



Shell rose colored mayense 



Shell orange guantanamense 



