CUBAN ANNULAPJIDAE TORRE AND BARTSCH 345 



The type of this subspecies was collected by Wright at Cayo del 

 Rey, Oriente Province. This subspecies differs from A. (S.) storchi 

 nipensis in having the axial ribs much smaller and more closely spaced, 

 and the denticles at the summit much less strongly developed. 



The specimen described and figured, U.S.N.M. No. 11001, is one 

 collected by Wright at Cayo del Rey. It has a little more than 5.0 

 whorls remaining and measures: Length, 8.6 mm.; greater diameter, 

 3.8 mm.; lesser diameter, 3.1 mm. 



Subgenus Annularisca Henderson and Bartsch 

 1920. Annularisca Henderson and Bartsch, Proc. U. S. Nat. Mus., vol. 5S, p. 72. 



Shell depressed-helicoid, widely, openly umbilicated, marked by 

 axial riblets on spire and base. Spiral sculpture absent, or restricted 

 to the umbilical wall, or sometimes consisting of microscopic lines. 



Type: Annularia {Annularisca) ehurnea ([Gundlach] Pfeiffer). 



KEY TO THE SPECIES OF THE SUBGENUS ANNULARISCA 



Spiral sculpture absent. 



Interior of aperture white ebumea 



Interior of aperture chestnut brown prestoni 



Spiral sculpture present. 



Umbilical wall with spiral threads. 

 Shell decidedly depressed. 



Spiral sculpture on spire present aberrans 



Spiral sculpture on spire absent. 



Interior of aperture orange auricoma 



Interior of aperture pale pallens 



Shell moderately elevated. 



Axial ribs rounded alata 



Axial ribs sharp tacrensis 



ANNULARIA (ANNULARISCA) EBURNEA ([Gundlach] Pfeiffer) 



Plate 41, Figures 4-6 



1858. Choanopoma ehurneum [Gundlach] Pfeiffer, Malakozool. Blatter, vol. 5, 



p. 188. 

 1862. Cyclostoma ehurneum Reeve, Conchologia iconica, No. 159. 

 1920. Annularia (Annularisca) ehurnea Henderson and Bartsch, Proc. U. S., 



Nat. Mus., vol. 58, p. 72. 



Shell very depressed-helicoid, very broadly openly umbilicated, 

 milk-white. Nuclear whorls almost 2, well rounded, microscopically 

 granulose, forming a depressed spire. Postnuclear whorls strongly 

 rounded, marked by slightly retractively curved, fairly regularly 

 spaced axial threads only. Suture strongly impressed. Periphery of 

 the last whorl well rounded, the basal portion of the whorls well 

 rounded, all of the turns showing to the apex in the broad, open 

 umbilicus, marked by the continuation of the axial riblets, which 



