HISPANIOLAN AND BAHAMAN ANNULARIIDAE 149 



well rounded. Base strongly rounded and marked by the continuation 

 of the axial ribs and i6 spiral cords. The umbilical wall is also marked 

 by the continuation of the axial ribs and 14 spiral cords; the latter vary 

 in strength. Aperture almost circular, somewhat oblique ; peristome 

 double, the inner decidedly exserted ; the outer fiaringly expanded and 

 marked by slender, concentric laminae, much broader on the outer lip 

 and at the posterior angle, narrower on the inner lip and rolled inward 

 toward the inner peristome on the basal half of the inner lip. Operculum 

 typically abbottellid. 



The type (U.S.N.M. No. 504090) has 5 whorls and measures: Height, 

 7.5 mm. ; greater diameter, 10.6 mm. ; lesser diameter, 7.4 mm. It was 

 collected by Dr. W. L. Abbott at Cape Samana, Dominican Republic. 



U.S.N.M. No. 504091 contains 208 topotypes from the same source. 



ABBOTTEL,L,A SANCHEZI, new species 



Plate 26, Figures 1-3 



Shell depressed-helicoid, pale brown, with the peristome flesh-colored. 

 Nuclear whorls 2, strongly rounded, minutely granulose. Postnuclear 

 whorls inflated and strongly rounded, marked by numerous closely 

 crowded axial ribs, of which 221 are present on the last turn. In addi- 

 tion to this, the whorls are marked by spiral cords which are of two 

 strengths. Of these cords 13 are present between the summit and the 

 periphery on the last whorl. The junction of the spiral threads and axial 

 ribs forms nodules whose strength depends upon the strength of the 

 spiral cords. Suture moderately channeled. Periphery rendered slightly 

 angulated by a strong spiral cord. Base strongly rounded, widely openly 

 umbilicated, and marked by the continuation of the axial ribs and eight 

 spiral cords. The umbilical wall is also marked by the continuation of 

 the axial ribs and eight decidedly strong spiral cords. Both on the base 

 and umbilical wall the junction of the axial ribs and spiral cords form 

 nodules. Aperture almost circular; peristome double, the inner some- 

 what exserted; the outer flaringly expanded, of about the same width 

 all around. Operculum typically abbottellid. 



The type (U.S.N.M. No. 504092) was collected by Dr. W. L. Abbott 

 2 miles northwest of Sanchez, Dominican Republic. It has 4.8 whorls 

 and measures: Height, 6.9 mm.; greater diameter, 9.1 mm.; lesser di- 

 ameter, 7.6 mm. 



U.S.N.M. No. 504093 contains 149 topotypes from the same source. 



Another lot of 15 specimens (U.S.N.M. No. 504094) was also col- 

 lected by Dr. Abbott on a hillside north of Sanchez. 



ABBOTTEI.I/A ADOLPHI (Pfeiffer) 



Shell helicoid, of various shades of brown, with the expanded peri- 

 stome paler, with or without rays. The postnuclear whorls are marked 

 by closely crowded axial ribs, which are crossed by fine spiral threads 



