44 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



The type (U.S.N.M. No. 472025) was collected by C. R. Orcutt at 

 Fonds Verettes. It is a complete specimen of 5.3 whorls and measures: 

 Length, 7.8 mm.; greater diameter, 5.1 mm.; lesser diameter, 4.9 mm. 



The extremely diminutive size alone will readily distinguish this from 

 all the other known species. 



CHONDROPOMA (ABTICULIPOMA) BUSSELl,!, new species 



Shell broadly ovate, flesh-colored or of pale bufT ground color, spotted, 

 vermiculated, or fulgurated with inconspicuous, interrupted spiral or 

 axial bands of chestnut-brown. The nuclear whorls are flesh-colored 

 in some of the races and brown in others. The peristome likewise varies 

 in the different races from flesh-colored to pale brown. Nuclear whorls 

 about 2, inflated, strongly rounded, and smooth except for the last por- 

 tion of the last turn, which shows the beginning of the postnuclear sculp- 

 ture. The postnuclear whorls are strongly inflated, well rounded, and 

 marked by very closely spaced, fine axial riblets, which are rendered 

 articulate by the low, broad, spiral, tumid areas. Suture well constricted ; 

 periphery inflated, strongly rounded. The base is very short, inflated, 

 strongly rounded, openly umbilicated, and marked like the spire with 

 the spiral sculpture a little less strongly emphasized, however, which 

 renders the articulation less pronounced. The umbilical area shows 

 feeble spiral threads. Aperture very broadly ovate. Peristome double, 

 the outer very broadly expanded, strongly auriculate at the posterior 

 angle and even more flaringly expanded on tlie anterior columellar 

 border, quite narrow on the parietal wall ; the inner peristome is exserted 

 and well reflected. The operculum is paucispiral, with almost subcentral 

 nucleus, covered on the outside with a thin deposit of calcareous gran- 

 ules. 



Several races of this species were collected by C. R. Orcutt on the 

 path leading from Fonds Verettes to Saltrou; they represent occupants 

 of distinct mountain spurs. 



The species can readily be distinguished from Chondropoma (Articii- 

 lipoma) caroli by its much finer and more closely spaced ribbing. The 

 following key will help to differentiate the subspecies: 



KEY TO THE SUBSPECIES OP CHONDROPOMA (ARTICULIPOMA) RUSSELLI 



Shell large, length more than 12 mm russelli 



Shell not large, length less than 11 mm. 



Early whorls light tesbori 



Early whorls dark caibai 



CHONDROPOMA (ARTICHLIPOMA) RUSSEL,!.! RUSSELIvI, new subspecies 



Plate 8, Figure 6 

 This race was collected by C. R. Orcutt at his second station near 

 Bodarie. It represents shells almost as large as those of Chondropoma 

 (Articulipoma) caroli caroli, from which the finer, more closely spaced 



