THE Cl-CLOPHORID LAND MOLLUSKS OF AMEKICA 31 



spicuoiis. Periphery inflated, strongly rounded. Base short, well 

 rounded, with a rounded carina marking the outer edge of the open 

 umbilicus. Aperture almost circular; peristome rather broadly ex- 

 panded, thickened, and marked by concentric lines of growth of 

 about equal width, except that of the parietal wall, which is much 

 narrower. Operculum typically farcimenid. 



This species is restricted to Pan de Guajaibon, where it is very 

 abundant about Hato Sagua. The specimen described and figured, 

 U.S.N.M. No. 535928, is one of a large series collected by Henderson 

 and Bartsch. It has 7.3 whorls and measures: Height, 29.3 mm.; 

 greater diameter, 17.2 mm. 



This species is easily distinguished from all other Farcimens by its 

 stout, short, decidedly inflated form. 



FARCIMEN (FARCEWEN) SUBVENTRICOSUM, new species 



Shell varying greatly in form in the different subspecies; in some 

 it is elongate-ovoid; in others, elongate-conic. In color the shells 

 vary from soiled wax color to pale orange to pale brown; they may 

 be unicolor or darker on the later turns, and the last may even be 

 purplish plum colored. Nuclear whorls almost 2, small, well rounded, 

 smooth. Postnuclear whorls inflated, strongly rounded. In one sub- 

 species they are marked by rather strong, well-defined axial ribs on 

 all but the last turn. In others, the axial riblets are in the form of 

 hair lines on the early turns, evanescing shortly thereafter. Suture 

 constricted to a varying degree in the different races. Periphery 

 well rounded. Base moderately produced in all the races, moderately 

 broadly openly umbilicated with a rounded carina at the outer limit 

 of the umbilicus. Aperture subcircular; peristome moderately ex- 

 panded, decidedly thickened and reflected, protracted on the columel- 

 lar wall and decidedly narrowed on the parietal wall and marked by 

 concentric lines of growth. Operculum typically farcimenid. 



This species ranges from the Rio San Diego north of San Diego de 

 los B alios, through the Organos Mountains to Pan de Guajaibon, 

 through the Sierra Chiquita, west through the Sierra de Galalon and 

 Sierra de Pico Chico ; the Sierra de San Andres to Vinales. 



We are recognizing three subspecies, which the following key 

 will help to distinguish : 



KEY TO SUBSPECIES OF FARCIMEN (FARCIMEN) SUBVENTRICOSUM 



Axial riblets rather strong multistriatinum 



Axial riblets not strong. 



Shell slender balneorum 



Shell stout subventricosum 



