CERION, GROUP VII. 229 



Havana, is completely identical with C. fastiyatum, which Maynard 

 himself reports from " Chorrea," an error for Chorrera, a village 

 situated a few miles from Havana. 



Figures 11, 12 are from Chorrera specimens, fig. 10 from Carmelo. 

 It occurs both white and marbled at both localities. 



Var. hondana Pilsbry. Shell cylindric or tapering, ribbed as usual 

 to the nepionic whorl, 17-23 ribs on the penult, whorl ; sometimes 

 cut by engraved spiral lines, as in the group of O. scalarinum. 

 White, with sparse and indistinct gray markings. Whorls 9^, 

 moderately convex : lip reflexed, the parietal callus thin inside, the 

 ribs showing through. Parietal tooth minute or obsolete. Length 

 20|, diam. 8^ mill. Bahia Honda. 



The occasional development of engraved spirals shows how closely 

 the mumia group is related to the scalarinum group, through such 

 forms as hondana and sueyrasi. 



Subsp. MUMIOLA (Pfeiffer). PI. 29, tigs. G2, 63, 64. 



Shell shortly and deeply rimate, oblong-cylindric, rather solid, 

 closely marbled with white and corneous-brown ; sculptured through- 

 out with rather spaced and narrow longitudinal riblets, separated by 

 wider intervals, and about 15 to 20 in number on the penult whorl. 

 Cone of the spire short ; last 3 whorls of about equal diameter. 

 Whorls 8^-9, somewhat convex. Aperture truncate ovate, brown 

 within ; parietal lamella small and rather short ; axial lamella tooth- 

 like ; peristome white, typically rather narrowly reflexed but in a 

 large form of the species it is very broad. Parietal callus thin and 

 transparent. 



Length 20, diam. 9, oblique height of apert. 9 mill. (Pfr. type). 



Length 18, diam. 8 mill. 



Length 21, diam. 8 mill. 



Cuba : Mntanzas, at "Playa de Indias " (Pfr.). 



Pupa mumiola PFR., Archiv f. Naturg. 1839, i, p. 353; Monogr. 

 ii, p. 324; iii, 539; iv, 656; vi, 288; Mai. Bl. i. p. 204, pi. 3, f. 

 6-8. POEY, Memorias ii, p. 60, pi. 5, f. 21 (genitalia). KUSTER ) 

 Conchyl. Cab. p. 90, pi. 13, f. 1, 2 (figs, of type). Cerion mumiola 

 and C. m. major, P. & V., Proc. A. N. S. Phila. 1896, p. 322.- 

 Cerion (Maynardia) mumiola Pfr., DALL, Bull. Lab. Nat. Hist. 

 State Univ. of Iowa, iv, p. 21 (1896). Strophia mumiola Pfr., 

 MAYNARD, Contrib. to Science iii, p. 16, pi. 4, f. 1, 2. 



