210 CKRION, GROUP V. 



beneath, deeply rimate, ascending to the aperture. Aperture sub- 

 circular, rufous inside ; perislome thickened, reflexed, the margins 

 continuous. Columella with a fold at the base, the left margin one- 

 toothed. Length 30, diam. 14 mill. Desk, in Ferussac, Histoire, 

 ii, p. Wl.Hdix (Cochlodontci) uva FER., Hist., pi. 153, f. 8. 



Cuba (Deshayes). 

 The ribs are somewhat more spaced than in multicostum. 



C. IOSTOMUM (Pfeiffer). PL 28, fig. 44. 



Shell deeply rimate, oblong-conic, solid, distantly plicate-costate, 

 opaque, calcareous ; spire lengthened, terminating in a slightly obtuse, 

 densely costulate cone, marbled with corneous. Suture with exserted 

 margin. Whorls 11, nearly flat or a little convex, the last forming 

 two-fifths the length, ascending in front, corrugated, the base com- 

 pressed. Aperture truncate-oval, violet colored within, provided 

 with a deep-seated parietal tooth and an oblique columellar fold. 

 Peristome thick, reflexed throughout, the margins joined by a rather 

 thick callus, columellar margin flexuous. Length 32, diam. 12, 

 aperture with peristome 13 mill, long, 10 wide (P/V.). 



Cuba: on the southern coast, on Opuntia (Gundlach). 



Pupa iostoma PFR., Malak. Bl., 1854, p. 204; Monogr., iv, p. 



650 ; vi, 289 (exclusive of locality, Turk's Island) SOWB., C. 



Icon., pi. 3, f. 22 Cerion iostomum PILS. and VAN., Proc. A. N. 



S. P., 1896, pp. 320, 329, pi. 11. f. 14, with var. arangoi, t, c., p. 

 330, pi. 11, f. 12 Of. ARANGO, Fauna Mai. Cub., p. 100. 



Pfeiffer mentions two forms : b is somewhat more obese, with the 

 median whorls nearly smooth, only very finely rippled, the last with 

 spaced folds ; and g is smaller, and more or less, but always dis- 

 tantly, ribbed, length 21-25 mill. 



The specimen figured answers to the description of Pfeiffer in all 

 respects save that the median whorls are only obsoletely ribbed, 

 hardly " distanter plicato-costata " more like the " var. /V' The 

 post-nepionic whorls of the cone are " conferte costulatum ;" the cone 

 itself " corneo-marmoratum," suture conspicuously u exserto -margin- 

 aid," and the corrugation of last whorl and color of aperture ("intvs 

 violacea ") are likewise in agreement. The specimen figured is 2 

 mm. shorter than Pfeiffer's. Length 30, diam. 12; alt. of aperture 

 12 mill. 



This species was described from the south coast of Cuba living 



