22 BULLiETIN 181, IHSTIT'EiD SiTATES imTTOiNiAaL. MUSEfUM 



ing axial riblets which on the succeeding whorls break up into shorter 

 elements to form a very complex and irregular network of meshes, 

 between which deep pits are present. The pittings rather than the 

 meshes that enclose them catch one's eye. Suture deeply constricted. 

 Periphery well rounded. Base somewhat produced, openly umbili- 

 cated, with the edge of the umbilicus more or less carinated, not 

 pitted. Umbilical wall marked by lines of growth only. Aperture 

 oval with the long axis oblique to that of the spire. Peristome de- 

 cidedly expanded, thickened, and reflected, excepting the parietal 

 portion, widest on the columella, more or less alate at the posterior 

 part of the columella and outer lip. Operculum typically farcimenid. 

 This species is confined to the Trinidad Mountain complex of 

 southern Santa Clara Province. 



KEY TO THE SUBSPECIES OF FARCIMEN (FARCIMEN) ALUTACEUM 



Shell large, height about 30 mm magnificum 



Shell medium sized, height about 25 mm alutaceum 



Shell small, height about 17 mm digitale 



FARCIMEN (FARCIMEN) ALUTACEUM MAGNIFICUM, new subspecies 



Plate 4, Figures 13-15 



This subspecies occurs at Sopimpa, Santa Clara Province. The 

 shell of this race is very large, agreeing in shape and sculpture with 

 F. (F.) alutaceum alutaceum ([Menke] Pfeiffer) and F. (F.) alu- 

 taceum digitale (Gundlach) , from which it differs by a little weaker 

 pitting on the last turn and by its gigantic size. 



The type, U.S.N.M. No. 535898,, has 5.3 whorls remaining and 

 measures : Height, 30.3 mm. ; greater diameter, 15.4 mm. 



FARCIMEN (FARCIMEN) ALUTACEUM ALUTACEUM ([Menke] Pfeiffer) 



Plate 4, Figures 10-12 



1846. Cyclostoma alutaceum (Menke) Pfeiffee, Zeitschr. Malak., vol. 3, pp. 

 85-86. 



We have this typical race from Quemado Feo, north of Trinidad. 

 It is intermediate in size between F. {F.) alutaceum, magniilcum and 

 F. (F.) alutaceum digitale (Gundlach). It has the whorls a little less 

 convex. 



The specimen described and figured, U.S.N.M. No. 535899, has 4.5 

 whorls remaining and measures : Height, 25.1 mm. ; greater diameter, 

 13.3 mm. 



