46 BULLETIN 181, UNITED STATES NATIONAL MUiSEUM 



well rounded. Base moderately protracted, narrowly umbilicated, 

 the umbilicus marked by a strong carina at its outer edge. Aperture 

 subcircular; peristome somewhat sinuous, not in one plane, simple. 

 Operculum typically farcimenid. 



The specimen described and figured is one of a series, U.S.N.M. 

 No. 535692, collected by me at Lares, Puerto Kico. It has T.l whorls 

 and measures : Height, 19.7 mm. ; greater diameter, 8.9 mm. 



This species resembles the large F. {N.) croceum (Gmelin) in the 

 constriction below the summit and also in the character of the rib- 

 bing, which is much finer than that of the other small species, F. 

 (N.) mirturn (Dall and Simpson), from eastern Puerto Eico. 



We also have it from a number of additional stations in the west- 

 central portion of the Island of Puerto Rico. 



FARCIMOIDES, new genus 



Shells resembling those of the Cuban genus Farcimen in general 

 outline and thickened peristome, but with a spiral cord marking the 

 outer limit of the umbilicus. Operculum not simple but with the 

 many layers composing it distinct, not fused as in Farcimen. 



Type: Cyclostoma orUgmji FMQer=Farcimoides orhignyi 

 (Pfeiffer). 



KEY TO THE HISPANIOLAN SPECIES OF FARCIMOmES 



Shell small, height less than 20 mm sallei 



Shell not small, height more than 25 mm. 



Shell stout domingoense 



Shell not stout orbignyi 



FARCIMOIDES SALLEI, new species 



PiATE 9, Figures 29-31 



1851. Cyclostoma orUgnyi va. 7 Pfeiffer, Proc. Zool. Soc. London, vol. 19, p. 149. 

 1853. Cyclostoma orbignyi variety 2 Pfeiffbr, Martini-Chemnitz Conchylien 

 Cabinet, vol. 1, sect. 19, p. 272, pi. 87, figs. 5, 6. 



Shell small, very elongate-ovate, covered with a wax-colored perios- 

 tracum. When denuded the shell may be unicolor or milk white, 

 or the last whorl may be darker, even purplish plum colored. Nu- 

 clear whorls small, well rounded, smooth. The early postnuclear 

 whorls inflated, strongly rounded, the last one almost flattened; the 

 early ones marked by slender, almost hairlike axial riblets which 

 gradually increase in strength until they become conspicuous, re- 

 tractively curved, elevated ribs, which are about as wide as or wider 

 than the spaces that separate them. Suture strongly constricted. 

 Periphery well rounded. Base rather long, openly umbilicated with 

 a strong cordlike carina marking the outer limit of the umbilicus. 

 This has a strong constriction anteriorly and posteriorly. The axial 



