242 CERION, GROUP IX. 



C. GUBKRNATORIUM (Cros*e). PI. 36, figs. 31, 32, 33, 34. 



Shell deeply but shortly rimate, oval or tapering-oblong, rather 

 strong and solid ; white, nearly uniform or with livid stains, or varie- 

 gated with reddish-brown or gray brown irregular stripes; glossy, 

 nearly smooth or with the last one or two whorls finely costulate. 

 Spire rather slowly tapering, with convex outlines and an obtuse apex. 

 Aperture large, dark or pale brown within, the peristome white or 

 brown, narrowly reflexed and recurved, often much thickened on its 

 face. Parietal lamella strong but short ; columellar lamella small. 

 Parietal callus varying from thin to strong. 



Length 23, diam. 11, longest axis of aperture 9^ mill. (type). 



Length 26^, diam. 12, longest axis of aperture 11^ mill. 



Length 19, diam. 10, longest axis of aperture 9 mill. 



Bahamas : New Providence (Sir Rawson W. Rawson). 



Pupa gubernatoria CROSSE, Journ. de Conchyl., 1869, p. 186; 

 1870, p. 105, pi. 2, f. 4 (lower figure). PFR., Monogr., viii, p. 354. 



Readily distinguished from other species of New Providence by 

 the large brown aperture, tapering contour, and the smoothness of 

 the upper portion, while the last whorl or two may be either smooth 

 or finely costulate. Crosse's type (pi. 36, fig. 31) was white, but 

 specimens richly variegated with brown are equally abundant in the 

 series I have seen. 



C. AGASSIZI Dall. PI. 36, figs. 39, 40. 



Shell shortly rimate, cylindric-tajom'm/, the last whorl widest, very 

 thick and strong. Surface smoothish or with weak, low riblets irreg- 

 ularly developed; the last whorl sculptured ivith sharp, narroiv, ratlier 

 high riblets on its latter portion. Whorls 10 to 11, nearly flat, the 

 spire passing gradually into a long cone terminating in a very obtuse 

 apex. Aperture irregularly ovate, the peristome broadly expanded in 

 a thin flange, in front of which it is built forward, very thick, con- 

 tinued in a strong, straight or arcuate raised ledge across the parietal 

 wall. Parietal lamella strong and long ; axial lamella small. 



Length 35, diam. 13 mill. 



Length 31, diam. 12^ mill. 



Bahamas: New Providence, fossil in calcareous sand-rock, at the 

 W. quarry, top of Nassau Ridge (A. Agassiz). 



C. (Maynardia) agassizi DALL, Bull. Mus. Comp. Zool., xxv, no. 

 0, p. 120, pi. , figs. 9, 10. 



