46 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



brown spot. Interior of the aperture flesh-colored, showing the banding 

 of the exterior on the inside. The nucleus consists of 2.2 whorls, which 

 form a rather blunt apex. The postnucleur whorls are inflated and 

 strongly rounded and are crossed by numerous closely spaced axial 

 riblets, which are separated by mere impressed lines. A number of these 

 riblets fuse at the summit to form rather strong denticles. The spiral 

 sculpture consists of weak, rather closely spaced threads, which are 

 about as wide as the spaces that separate them and which render the 

 axial riblets nodulose at their junction, thus forming a vertebrated pat- 

 tern. The summit of the whorls is slightly tabulated. Periphery inflated 

 and strongly rounded. Base short, inflated, strongly rounded, rather 

 widely openly umbilicated, and marked by a weak continuation of the 

 axial riblets and exceedingly feeble spiral sculpture except on the 

 umbilical wall where near the outer edge a couple of feeble threads are 

 indicated. The last whorl is solute for about one-tenth of a turn. Aper- 

 ture broadly oval; peristome double, the inner reflected and adnate to 

 the outer; the outer peristome is expanded on the outer lip and more 

 so on the anterior portion of the inner lip. It is much narrower on the 

 parietal wall and does not form a conspicuous auricle at the posterior 

 angle as is the case in C. (A.) russelli. The operculum is typically articu- 

 lipomid. 



The type (U.S.N.M. No. 536861) was collected by Dr. W. C. Wood- 

 ring 5 miles north of Hatillo on the road to Sabana de la Mar, Dominican 

 Republic. It has 6.5 whorls and measures: Length, 16.2 mm.; greater 

 diameter, 10.2 mm. ; lesser diameter, 8.0 mm. 



U.S.N.M. No. 533200 contains 20 topotypes. 



This species is larger than any of the other Articulipomas and can 

 readily be differentiated from C. (A.) russelli by having the peristome of 

 the inner lip much narrower than the rest. 



CHONDROPOMA (ARTICULIPOMA) FLUXUSI, new species 



Plate 7, Figures 2-11 



Shell varying considerably in shape from elongate-ovate. The ground 

 color may be buff or pale brown. There are interrupted, almost con- 

 tinuous, wavy, spiral bands of brown, which vary considerably in 

 width and spacing. The peristome and the parietal wall portion of 

 the solute whorls are buff. The peristomes show the color bands as rays. 

 Nuclear whorls almost 2, inflated, well rounded, forming a slender apex. 

 The postnuclear whorls are inflated, strongly rounded, and marked by 

 almost vertical sublamellar axial ribs, which are rendered scalloped by 

 broad, low, rounded, tumid, spiral ridges, which give a vertebrated aspect 

 to the ribs. These ribs extend strongly above the summit of the whorls 

 as false tufts. The tufts may consist of two to five riblets that project 

 to usually form a more or less pointed projection. The spaces that 

 separate the ribs are as wide as the riblets. Suture strongly constricted; 



