36 BULLETIN 181, UNITED STATE© NATIONAL MUSEUM 



of growth, produced on the columella and much narrower on the 

 parietal wall than on the rest. Operculum typically farcimenid. 



We are recognizing two subspecies, which the following key will 

 help to distinguish: 



KEY TO SUBSPECIES OF FARCIMEN (FARCIMEN) HENDERSONI 



Axial riblets strong catalinense 



Axial riblets obsolete hendersoni 



FARCrWEN (FARCIMEN) HENDERSONI CATALINENSE. new subspecies 



Plate 7, Figures 22-24 



This race comes from La Catalina north of San Diego de los 

 Baiios. We also have it from La Cumbre and Hato Caimito west of 

 Pan de Guajaibon, Pinar del Eio Province. This is smaller than 

 typical F. (F.) hendersoni and has very pronounced, distantly spaced, 

 slender riblets, which are present even on the last turn. 



The type, U.S.N.M. No. 535937, comes from Cayito de la Catalina. 

 It has 5.5 whorls remaining and measures : Height, 22.3 mm. ; greater 

 diameter, 11.0 mm. 



FARCIMEN (FARCIMEN) HENDERSONI HENDERSONI, new subspecies 



Plate 7, Figures 13-15 



This subspecies has a rather wide distribution, extending from 

 Paso Real through Teneria de Guane, through La Murrallia eastward 

 to Giiira de Luis Lazo; Lagiinillas; Mogote del Cerro de Cabras to 

 Cayo San Felipe; Consolacion del Sur and Entronque Herradura, 

 Pinar del Eio Province. On the north side it extends through 

 Mogote Pan de Aziicar, the valley east of Bahos de San Vicente 

 through La Mina and Bella Maria, Pinar del Rio Province. This 

 race is a little larger than F. {F.) hendersoni catalinense and has 

 the whorls almost smooth, while catalinense has them strongly ribbed. 



The type, U.S.N.M. No. 535936, comes from the Mogote del Cerro 

 de Cabras. It has 7.1 whorls and measures: Height, 24.0 mm.; 

 greater diameter, 12.3 mm. 



FARCIMEN (FARCIMEN) ARANGOI, new species 



Plate 7, Figures 16-18 



Shell very small, ovate. Nuclear whorls decollated. Postnuclear 

 whorls very strongly inflated, rounded, and marked by slender, re- 

 tractively curved axial riblets, which grow irregular and less dif- 

 ferentiated on the last turn. Suture strongly constricted. Base 



