370 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



umbilicated, marked by the continuation of the axial riblets and the 

 spiral threads equaling those of the spire on the last turn in strength 

 and spacing; immediately within the umbilicus there are several 

 stronger spiral threads. Aperture very broadly oval; peristome 

 double, the outer slightly expanded and slightly reflected, denticulate 

 at the junction of the inner and basal lip; the inner moderately ex- 

 serted and also reflected and almost fused Avith the outer. Operculum 

 very thin with the nucleus halfway between marginal and central, 

 the inner half of the last whorl covered with a very thin coat of cal- 

 careous granules. 



This species is confined to eastern Cuba where it breaks up into a 

 number of subspecies here described. 



Of the typical race Gundlach says: "On trees. Animal brownish 

 white, on the head (between the antennae), and on the rump gray. 

 Neck clay yellow; anteimae bright brown with white apex. The 

 region about the eye white." 



KEY TO THE SUBSPECIES OF CHONDROPOMA (CHONDROPOMORUS) DILATATUM 



Greater diameter more than 8.5 mm toroense 



Greater diameter less than 8.0 mm. 



Sculpture rather coar.se pilotense 



Sculpture fine. 



Denticles at the summit fine and closely spaced. 



Interrupted .spiral bands of brown broad bayatense 



Interrupted spiral bands of brown narrow dilatatum 



Denticles at summit not fine or closely spaced subdilatatum 



CHONDROPOMA (CHONDROPOMORUS) DILATATUM DILATATUM (Gundlach) Pfeiffer 



Plate 34, Figure 9 



1859. Cyclostoma dilatatum (Gundlach) Pfeiffer, Malakazool. Blatter, vol. 6, 

 p. 75. 



This race, which originally was collected by Gundlach along the 

 River Yateras, by Wright at Monte Verde, and by Henderson and 

 Bartsch on the shoulder of Monte Libano near the Guaso River, has 

 the whorls moderately inflated and finely denticulated at the sum- 

 mit. The interrupted spiral bands are, comparatively speaking, nar- 

 row, the surface is blotched with white areas suggesting a watered 

 silk aspect. 



The specimen described and figured, U.S.N.M. no. 493258, is one of 

 two collected by Gundlach at Yateras. It has 8.0 whorls remaining 

 and measures: Length, 16.6 mm; greater diameter, 7.6 mm; lesser 

 diameter, 6.1 mm. 



Of the subspecies here described it most nearly resembles C. (C.) 

 dilatatum hayatense, from which it can be distinguished easily by its 

 larger size and narrower interrupted spiral bands. 



