HISPANIOLAN AND BAHAMAN ANNULARIIDAE 153 



four in the umbilicus, and measures : Height, 5.3 mm. ; greater diameter, 

 7.5 mm. ; lesser diameter, 6.6 mm. The last whorl is much more rounded 

 than in typical Abbott clla gabbi gabbi, and the first strong keel, posterior 

 to the periphery, is almost as strong as the peripheral keel; the spaces 

 between the two are flatter. 



U.S.N.M. No. 504100 contains 52 topotypes from the same source. 



ABBOXTKLLA CBOSSBI (FUsbry) 



Plate 27, Figures 13-15 



1933. Choanopoma crossei Pilsbry, Proc. Acad. Nat. Sci. Philadelphia, vol. 85, 

 p. 130, pi. 7, figs. 5, Sa, 6. 



Shell helicoid, pale horn-colored, with the outer peristome rayed with 

 brown. Nuclear whorls 1.6, well rounded, forming a slender apex. Post- 

 nuclear whorls strongly inflated, well rounded, marked by axial ribs, 

 which are more or less grouped in series, several stronger ones being 

 followed by less strongly developed threads. Of the axial ribs 73 are 

 present on the last whorl. The spiral sculpture consists of slender threads, 

 of which 12 are present between the summit and periphery, 12 on the 

 base, and 11 on the umbilical wall. The junction of the axial ribs and 

 spiral threads forms sharp cusps on the spire and base, but not within 

 the umbilicus. Suture strongly constricted. The umbilicus is broad and 

 funnel-shaped. Aperture almost circular; peristome double, the inner 

 exserted ; the outer broadly expanded and obliquely reflected and marked 

 by slender concentric lamellae. Operculum typically abbottellid. 



Dr. Pilsbry's type (Acad. Nat. Sci. Phila. No. 7951 1) measures: 

 Height, 5.4 mm. ; greater diameter, 7.5 mm. ; lesser diameter, 5.5. It is 

 without specific locality. 



The specimen figured (U.S.N.M. No. 504101) was collected by W. L. 

 Abbott half a mile from the sea, 1.5 miles east of Puerto Frances, 

 Samana Bay, Dominican Republic. It has 4.6 whorls and measures: 

 Height, 6.0 mm. ; greater diameter, 9.6 mm. ; lesser diameter, 6.6 mm. 



U.S.N.M. No. 366799 contains 100 specimens from the same locality. 



U.S.N.M. No. 504102 contains 61 specimens also collected by Dr. 

 Abbott in a cave 2 miles northwest of Sanchez, Samana Bay. 



These specimens agree in every way with Dr. Pilsbry's type, and I 

 may therefore assume that it came from somewhere on the Samana 

 Peninsula. 



ABBOTTELLA TENTORIUM (Pfeiffer) 



Plate 27, Figures 1-3 



1850. Cyclostonia tentorium Pfeiffer, Zeitschr. Malak., vol. 7, p. 77. 



1852. Choanopoma tentorium Pfeiffer, Conspectus cyclostomaceorum, p. 27. 



1854. Cyclostoma tentorium Pfeiffer, Martini-Chemnitz Conchylien Cabinet, vol. 



1, pt. 19, p. 284, pi. 39, figs. 16-18. 

 1920. Ahbottella tentorium Henderson and Bartsch, Proc. U. S. Nat. Mus., 



vol. 58, p. 75. 



