HISPANIOLAN AND BAHAMAN ANNULARIIDAE 179 



form strong nodulose tufts at the summit. The spiral sculpture consists 

 of rather irregularly developed threads, of which 17 are present between 

 the summit and the periphery, and 10 on the base, and 4 on the umbilical 

 wall. Suture strongly constricted. Base well rounded, moderately broadly 

 umbilicated. Aperture ovate; peristome double, the outer flaringly ex- 

 panded on the inner lip and at the posterior angle where it forms an 

 auricle narrower on the outer lip and very narrow on the parietal wall, 

 which is adnate to the preceding turn; inner peristome moderately ex- 

 serted and reflected, appressed to the outer on the outer lip and parietal 

 wall. Operculum? 



The type (U.S.N.M. No. 369105) looks semifossil. It was collected 

 by Gerrit S. Miller, Jr., on the Boca del Infierno, Dominican Republic. 

 It has 5 whorls remaining and measures: Height, 21.0 mm.; greater 

 diameter, 11.7 mm.; lesser diameter, 9.1 mm. 



INCERTIPOMIA NESIOTES, new species 



Plate 30, Figure 5 



Shell elongate-conic, pale yellow, with interrupted spiral bands of 

 brown, of which three are present between the summit and the periph- 

 ery and two much broader on the base. These bands ray the outer 

 peristome. Nuclear whorls decollated in all our specimens. Postnuclear 

 whorls well rounded, appressed at the summit, and marked by exceed- 

 ingly fine, very regular, almost hairlike, retractively curved axial riblets, 

 of which 447 are present on the last turn in the type. The spiral sculp- 

 ture consists of slender hairlike threads a httle stronger than the axial 

 riblets, of which 31 are present between the summit and periphery on 

 the last turn. The combination of the axial riblets and spiral threads 

 gives to the surface a silky lustre. Suture strongly constricted. Periph- 

 ery inflated, strongly rounded. Base short, strongly rounded, openly 

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

 extend over the umbilical wall, and by 17 spiral threads. The umbilical 

 wall seems also to have indications of spiral threads. Aperture oval ; peri- 

 stome double, the outer enormously expanded and backward reflected, 

 broadest on the inner lip and adnate on the parietal wall; the inner 

 peristome is slightly exserted and appressed to the outer. Operculum 

 unknown. 



The type (U.S.N.M. No. 504148) was collected by Gerrit S. Miller, 

 Jr., on the upper Orange Key on the south side of Samana Bay, 

 Dominican Republic. It has 5.4 whorls remaining and measures: Height, 

 16.8 mm. ; greater diameter, 9.5 mm. ; lesser diameter, 6.7 mm. 



U.S.N.M. No. 369151 contains 7 topotypes, while U.S.N.M. No. 

 369139 contains 2 specimens also collected by Mr. Miller on the lower 

 Orange Key. 



