HISPANIOLAN AND BAHAMAN ANNULARIIDAE 43 



rounded cords that are quite strong on the outer half. The aperture is 

 irregularly ovate, the curve of the outer lip being more accentuated 

 than that of the parietal wall and columella. Peristome double; the outer 

 broadly expanded, forming an auricle at the posterior angle, widest at 

 the columella; the inner is moderately exserted and slightly expanded. 

 Both are beautifully rayed. At the insertion of the columella a brown 

 spot marks the termination of the brown spiral band. Operculum thin, 

 corneous, paucispiral, with the nucleus halfway between submarginal and 

 subcentral and covered by a rather heavy deposit of calcareous granules 

 on all but the outer edge. 



Dr. Pilsbry's type (Acad. Nat. Sci. Phila. No. i6o98o), which is here 

 described and figured, was collected by D. C. Pease at Sr. Del Monte's 

 Finca 5 or 6 miles west of Barahona in a gully near Salvation at an 

 altitude of 3,000 feet. It has 4.5 whorls remaining and measures : Length, 

 10.9 mm. ; greater diameter, 6.8 mm. ; lesser diameter, 5.2 mm. 



This species is easily distinguished from the other known Dominican 

 member of the group, Chondropoma (Articulipoma) cieloense, by having 

 a much more elongate form and a light-rayed peristome. 



CHONDROPOMA (ARTICUr.IPOMA) NANICULUM, new species 



Plate 6, Figure 5 



Shell very small, ovate, pale straw color, with the outside of the 

 umbilical wall and the peristome white. Nuclear whorls 2, inflated, 

 strongly rounded, and smooth except for the last portion of the last 

 turn, which shows the beginning of the postnuclear sculpture. The post- 

 nuclear whorls are inflated, very strongly rounded, very narrowly shoul- 

 dered at the summit, and marked by slightly retractively curved, sub- 

 lamellar axial riblets of which several become very slightly accentuated 

 at the summit, where they project a trifle to form inconspicuous false 

 tufts, a character less expressed in this species than in any I have so far 

 seen. These riblets are about as wide as the spaces that separate them. 

 The spiral sculpture consists of low, broad, obsolete, spiral, tumid areas, 

 which render the axial riblets articulate. Suture strongly constricted ; pe- 

 riphery inflated, strongly rounded. The base is short, inflated, strongly 

 rounded, and marked by the axial riblets; the spiral sculpture here is 

 quite obsolete, and the riblets scarcely become articulate. The umbihcus 

 is broad and open, and the umbilical area is marked by the fine continua- 

 tion of the axial riblets and several scarcely indicated spiral threads 

 on the outer half. The last whorl is solute for one-tenth of a turn. 

 Aperture broadly ovate ; peristome double, the outer, basal, and columel- 

 lar lip moderately broadly expanded and marked by concentric lines of 

 growth. On the parietal wall and the upper half of the columella the 

 outer peristome is only about half the width of the rest. The inner 

 peristome is exserted and slightly reflected. The operculum is thin and 

 paucispiral, with the nucleus halfway between submarginal and sub- 

 central; the outside is covered with fine calcareous granules. 



