40 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



Axial ribs not coarse. 



Shell elongate-ovate xenicum 



Shell ovate. 



Outer peristome of almost uniform width naniculutn 



Outer peristome not of almost uniform width. 

 Outer peristome of inner lip much wider 



than the rest russelli 



Outer peristome of inner lip much narrower 



than the rest woodringi 



Shell elongate-ovate fluxum 



Peristome simple loweanum 



CHONDBOPO»£A (ARTICCLIPOMA) CI£LO£NSE, new species 



Plate 6, Figure 4 



Shell ovate, pale brown with darker, narrow, interrupted, spiral 

 bands of brown. The interior of the aperture is pale brown and so 

 is the peristome. Nuclear whorls 2, forming a rather slender apex, mod- 

 erately inflated, well rounded, and smooth, except the last portion of 

 the last whorl, which shows the beginning of the postnuclear sculpture. 

 The postnuclear whorls are inflated, strongly rounded, appressed at the 

 summit, and marked by slender articulated axial riblets, which are sepa- 

 rated by mere impressed lines. These riblets become thickened at the 

 summit where three or four are heavier and project more than the rest, 

 forming white projections at the summit, the intervals between being a 

 little wider than the white projections. The spiral sculpture consists of 

 low, obsolete, broad cords, which render the riblets vertebrated at their 

 junctions. Suture well constricted; periphery inflated, strongly rounded. 

 The base is moderately long, strongly rounded, and marked like the spire. 

 Umbilicus broadly open; this area marked by fine spiral threads and 

 the continuation of the axial riblets. The last whorl is solute for one- 

 fifth of a turn. Aperture broadly ovate. The peristome is double; the 

 outer broadly flaringly expanded, forming an auricle at the posterior 

 angle, widest on the columella and narrowest on the parietal wall. The 

 operculum is unknown. 



The type (U.S.N. M. No. 472023) was collected by Dr. W. L. Abbott 

 at an elevation of 3,000 feet on the slopes of Loma di Cielo in the Bo- 

 haruco Mountains, Dominican Republic. It has 4 whorls remaining and 

 measures: Length, 12.4 mm.; greater diameter, 8.1 mm.; lesser diameter, 

 6,5 mm. 



U.S.N.M. No. 472024 contains 18 topotypes from the same source. 



Though I have not seen an operculum of this species, all the shell 

 characters suggest Articulipoma. 



The strength of the axial ribbing allies to it C. (A.) caroli, from 

 which, however, it is easily distinguished by its ovate shape and brown 

 peristome. 



