224 CERION, GROUP VII. 



Cuba : Gibara and Mayari, on the N. coast of Santiago de Cuba. 



Pupa scalarina Gundlach MSS., PFR., Malak. Bl., vii, 1860, p. 

 19; Monogr., vi, 292; Novit. Conch., p. 367, pi. 84, f. 16, 17 (as 



P. scalaris at foot of plate) Cerion scalarinum P. and V., Proc. 



A. N. S. P., 1896, p. 322. Strophia scalarina MATNARD, Contrib. 

 to Sci., iii, p. 28, pi. 6, f. 4, 5. Not P. scalarina Sowerby, Conch. 

 Icon, xx, pi. 17, f. 153, error for scalaris Parr. 



A peculiar little shell, intermediate between O. sueyrasi and C. 

 johnsoni in contour. 



VII. Group of C. mumia. 



This group includes several closely related species inhabiting the 

 northern coast of Cuba, from Bahia Honda on the west to Neuvitas- 

 toward the east, and probably further in both directions. The species 

 are cylindric, usually quite long, sculptured with rather wide spaced 

 ribs, which are occasionally wanting on the cone ; color whitish or 

 marbled and speckled ; parietal lamella varying from rather long, 

 the inner termination not readily visible from the aperture, to shorter 

 or obsolete. The whorls are rather convex. 



So far as known, none of the species have two forms, smooth and 

 ribbed, like members of the group of C. maritimum. 



1. Several lower whorls ribbed, the cone smooth or nearly so. 



a. Shell stout, the diam. about one-third the length ; usually 

 large, white. C. infandum, p. 225. 



a 1 . Shell slender, tapering, smaller. 



C. mumia fasti 'gatum, p. 227. 



2. All the whorls but the apical one ribbed. 



a. Ribs narrow, 20-27 on penult, whorl ; parietal callus and 

 lamella strongly developed. Length less than 2^ times the 

 diam. C. sanzi, p. 229. 



a 1 . Ribs stronger and usually fewer. 



b. Shell large, stout, 32x12 to 42x14 mill., with broad 

 peristome and rather long parietal lamella. 



C. mumia, p. 225. 

 i 1 . Similar but small, 15-22 mill. long. 



c. Copiously mottled with brown ; whorls 8^9. 



C. m. mumiofa > p. 228. 



c 1 . Whitish, sometimes spirally striate ; whorls 9^. 



C. in. hondana, p. 228.. 



