200 CERION, GROUP IV. 



joined by a thin callus, columellar margin dilated. Length 21-22, 

 diam. 7, aperture with peristome 7 mill, long, 6 wide (Pfr.}. 



Among many of the typical form, a few occurred of larger size, 

 narrow, uniform white or with very pale marking (Pfr.}. 



Cuba: Punta de Jicaco (Icacos or Hicacos), north of Cardenas, 

 in Matanzas province (Pfr.). 



Papa microstoma PFR., Malak. Bl., 1852, p. 207, pi. 3, f. 15, 16; 

 Monogr., iv, p. 659 (exclusive of var. 7) ? SOWERBY, C. Icon., pi. 

 2, f. 8. 



A rather slender, fine-ribbed and small-mouthed form, not identi- 

 fied with any certainty from any but the type locality. The original 

 description and figures are given. It differs from C. cyclostomum in 

 the thin parietal callus. 



C. GUNDLACHI (Pfeiffer). PI. o2, figs. 32, 33, 34, 35. 



Shell rimate-perforate, oblong-ovate, rather solid, nearly smooth ; 

 corneous, elegantly variegated with angular streaks and spots of 

 opaque white. Spire ovate-conic, the apex rather obtuse ; whorls 9, 

 flattened, the last ascending in front, nearly two-fifths the shell's 

 length, sub-compressed at the base. Aperture vertical, truncate- 

 oval, with a deeply placed parietal tooth, which is frequently obso- 

 lete. Columella with a slight fold ; peristome white, somewhat 

 thickened, narrowly spreading. Length 15, diam. in the middle 7 

 mill.; aperture with peristome 6 mill, long (Pfr.}. 



Cuba : Punta de San Juan de los Perros (Gundlach). 



Pupa gundlachi PFR., Zeitschr. f. Malak., 1852, p. 175, pi. 1, f. 

 39-42 ; Monogr. iii, p. 537. 



It is often smaller, length 13, diam. 5.7 mill.; and according to 

 specimens in the collection of the Academy, it is densely and finely 

 rib-striate on the cone and the latter part of the last whorl. This 

 variation has been described by Pfeiffer, who enumerates two forms, 

 one smaller and almost unicolored corneous, with only scattered dots 

 of white (fig. 34), the other also smaller and distinctly striate (fig. 35). 



The parietal lamella is short and small, sometimes hardly percep- 

 tible. 



C. TENUILABRE (' Gundlach ' Pfr.). PI. 32, fig. 26; pi. 44, f. 74. 



Shell shortly rimate, cylindric, rather short, terminating in a 



straight-sided cone; rather solid. Brownish-corneous, irregularly 



