34 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



CHONDBOFOMA (CHONDROPOMIUM) GIMBIENSE, new species 



Shell rather long, varying in shape from ovate to elongate-ovate, and 

 in coloration from buff to brown. There are axial light streaks, which 

 give the shell a somewhat watered-silk effect, and interrupted spiral 

 bands of brown and also vermiculations ; the latter, like the dark ele- 

 ments in the interrupted spiral bands, are arranged in axial series. 

 Nuclear whorls 1.6, all but the last portion smooth. This shows the be- 

 ginning of the postnuclear sculpture. The postnuclear whorls are rather 

 inflated, well rounded, narrowly shouldered at the summit, and marked 

 by slender, very regular, slightly sinuous axial riblets, which are about 

 as wide as the spaces that separate them. These ribs become slightly ac- 

 centuated at their summit and render the shoulder finely crenulated. At 

 irregular intervals these riblets at the summit are white and suggest 

 tufting, but they are not fused. Suture slightly channeled. Periphery 

 well rounded. The base is moderately long, inflated, strongly rounded, 

 and marked by the continuations of the axial ribs, which become a little 

 less strong as they bend into the open umbilicus. The umbilical wall is 

 marked by a few feeble spiral threads. The last whorl is solute for al- 

 most one-fifth of a turn, the posterior angle constituting a well-marked 

 keel, the outside of the peripheral area being marked by lines of growth 

 only. Aperture broadly oval. Peristome double, the outer and inner being 

 almost coextensive, the lip only slightly expanded and narrowly reflected, 

 the doubling best shown on the basal portion of the columella. The oper- 

 culum is paucispiral, with submarginal nucleus and covered on the out- 

 side with a moderately strong deposit of calcareous granules. 



This species was collected by C, R. Orcutt about the Riviere Gimbi, 

 which is near Saltrou on the south side of Haiti in the Departement de 

 I'Ouest. 



KEY TO THE SUBSPECIES OP CHONDROPOMA (CHONDROPOMIITM) GIMBIENSE 



Length of shell more than 13 mm saltrouense 



Length of shell less than 1 1 mm gimbiense 



CHONDBOFOMA (CHONDBOFOMIUM) GIMBIENSE SALTBOUENSE, new subspecies 



Plate 6, Figure 2 



This subspecies was also collected by C. R. Orcutt on the west side 

 of the Riviere Gimbi. It is a much larger race and much paler in color 

 than the typical form and shows much more conspicuously the vermicula- 

 tions, which are arranged in axial zones. The interrupted spiral bands 

 are faintly represented. The peristome and interior of the shell are pale 

 buff. 



The type (U.S.N.M. No. 471936) has lost the nuclear whorls. The 4 

 whorls remaining measure : Length, 14 mm. ; greater diameter, 7.9 mm. ; 

 lesser diameter, 6.7 mm. 



U.S.N.M. No. 402166 contains 10 topotypes from the same source. 



