CERION, GROUP V. 217 



Specimens from Cayo Piedra del Norte (R. Arango) vary from 

 chalky white sparsely maculate with gray on the cone, to the usual 

 marbled pattern. They are nearly smooth, and measure from 29x12 

 to 26x10^ mill. 



Form obscurum Maynard (pi. 30, figs. 81, 82). Rather thick and 

 heavy, smooth, bluish-white, obscurely marked with zigzag longi- 

 tudinal lines of very pale yellowish-brown, scarcely to be seen on the 

 lower whorls, better developed on the cone of the spire. Whorls 9. 

 Length 27^, diam. 10^ mill. Varying from 24^ to nearly 29 mill, 

 long. Cayo Birde del Norte, Cuba. This seems to be practically 

 typical sagraianum. I can find no difference whatever. 



There are some small, smooth specimens, pinkish-white with in- 

 distinct flesh colored stripe-marbling, the last whorl bluish-white, in 

 the collection of the Academy, labeled " Holguin, Cuba, Dr. Cande- 

 laria Herrera." This is far out of the well-established range of the 

 species, and may be erroneous, especially as that place is inland. 



C. POLITUM (Maynard). PI. 30, figs. 84, 85, 86, 87, 88. 



Shell shortly rimate, cylindrical, solid ; typically whitish, with con- 

 spicuous brown longitudinal stripes, which may be nearly straight or 

 somewhat dislocated or zigzag ; are numerous on the uppt-r portion 

 of the shell, but fewer below. Whorls 9^ to over 10, those of the 

 cone flat, or bulging below the sutures ; the last 3 forming the cylin- 

 drical portion, somewhat convex ; last whorl ascending. Cone of 

 the spire of medium length or short, frequently as though crowded 

 down or slightly "telescoped," the whorls of the upper half of the 

 cone usually densely and sharply striate, the rest of the shell smooth, 

 or having the base of the last whorl sharply plicatulate. Aperture 

 large, open, brownish within ; parietal lamella short, and usually 

 there is a callus or ill-formed lamella to the left of the parietal, more 

 or less connected with it, but diverging from it inwardly. Axial 

 lamella distinct, Peristome reflexed, sometimes heavily thickened. 

 Parietal callus moderate or heavy. 



Length 26.2, diam. 11.2 mill. (Maynard's type). 



Length 29.5, diam. 12.5 mill. 



Cuba : Cabo Cruz, at the southwestern angle of Prov. Santiago 

 de Cuba. 



Strophia marmorata polita MAYN., Contrib. to Science, iii, p. 14, 

 15, f. 2^, pi. 3, f. 3, 4. 



