290 PROCEEDINGS OF THE NATIONAL, MUSEUM Vol.89 



decollated in all our specimens. Postnuclear whorls strongly rounded, 

 marked by retractively cm-ved, slender, rather distantly spaced axial 

 riblets, which become expanded at the summit into narrow clawhke 

 elements; in the dark colored specimens the axial riblets are strongly 

 differentiated from the basic color by their white coloration. Suture 

 strongly constricted. Periphery well rounded. Base moderately 

 long, marked by the continuation of the axial riblets and by very 

 strong spiral cords outside of the plugged umbiUcus, which render the 

 axial riblets here elongatedly nodulose. Aperture subcircular; 

 peristome double, the inner well exserted and shghtly reflected; the 

 outer narrow on the anterior half of the outer lip and base, broadly 

 expanded on the inner lip and parietal wall, forming a conspicuous 

 auricle at the posterior angle. The inner hp of the outer peristome is 

 inbent m the middle so as to completely cover the umbiUcus. The 

 outer peristome is marked by strong, concentric lamellae. Operculum 

 typically annularid. The siphon is behind the peristome at the pos- 

 terior angle of the aperture; it is bent into the suture and apparently 

 communicates with the hollow axis, and through this with the truncated 

 tip. 



The specimen described and figured, U.S.N.M. No. 425683, is a 

 cotype collected by Doctors Pilsbry and Welch on the hill east of the 

 Chambas River near Florencia, Camagiiey Province. It has 4.4 

 whorls remaining, and measures: Length, 15.4 mm.; greater diameter, 

 8.9 mm. ; lesser diameter, 6.9 mm. 



Subgenus Annularops Henderson and Bartsch 



1920. Annularops Henderson and Bartsch, Proc. U. S. Nat. Mus., vol. 58, 

 p. 74. 



Shell ranging in form from elongate-ovate to elongate-conic. Axial 

 riblets sublamellar, rendered articulate by the spiral sculpture. 

 Parietal wall perforated by a breathing pore near the posterior angle. 

 Operculum typically annularid. 



Type: Annularia (Annularops) blaini ([Gundlach] Pfeiffer). 



KEY TO THE SPECIES OF THE SUBGENUS ANNULAROPS 



Last whorl solute. 



Shell broadly ovate sauvallei 



Shell elongate-ovate vannostrandi 



Last whorl not solute. 



Outer peristome of inner lip notched, umbilicus closed. 



Shell broadly ovate semicana 



Shell elongate-ovate. 



Shell pale coronadoi 



Shell reddish attenuata 



