CERION, GROUP V. 213 



usually short; axial lamella small. Peristome well reflexed, not 

 thickened ; parietal callus rather heavy. 



Length 30, diam. 12, length of aperture 11-13 mill. 



Length 35, diam. 13 mill. 



Cuba, northern shore of Matanzas Province : Punta de Maya, at 

 the entrance of Matanzas Bay on sticks and stones, close to high 

 tide mark, in company with Tectarius muricatus (Pfr., type loc.); 

 Cayo Blanco near Cardenas (Gundlach)- Boca de Jaruco (Clerch). 



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

 ii, p. 322; iii, 539 ; iv, 657 (forms typica and sublcevigata^ ; vi, 289 ; 



Malak.. Bl., 1854, p. 205 KUSTER, Conchyl. Cab., Pupa, p. 70, 



pi. 9, f. 10, 11 (typical form), f. 12, 13 (smooth form). ARANGO, 

 Fauna Mai. Cubana, p. 101. Strophia maritima Pfr., MAYNARD, 

 Contrib. to Science, i, p. 127, f. 31, pi. 13, f. 1, la (smooth form). 

 Cerion maritimum Pfr., P. and V., Proc. A. N. S., Phila., 1896, 

 p. 320. C. m. sublcevigatum Pfr., P. and V., P. A. N. S., 1895, p. 



209 ? Pupa mumia POT. and MICH., Galerie, i, p. 169, pi. 17, f. 



1,2. 



Typical G. maritimum is distinctly and rather finely costulate, and 

 while usually almost unicolored whitish, it is occasionally somewhat 

 mottled or sparsely speckled, like C. mumia chrysalis. The costula- 

 tion is decidedly coarser than in the ribbed form of C. sagraianum. 

 C. incanum is smoother than maritimum. The young are usually 

 toothless, but sometimes have 4 teeth and an axial plait. 



Form sublavigatum Pfr. (PI. 30, figs. 75, 76.) Shell smooth or 

 nearly so, the riblets of the typical form being subobsolete or almost 

 wanting except on the terminal cone, which is finely and densely 

 rib-striate ; whitish, the terminal cone often marbled with gray- 

 brown. Occurs at Punta de Maya, at the eastern side of the en- 

 trance 'of Matanzas Bay, with the ribbed form (f. 75), on Cayo 

 Blanco, and at or near Cardenas (fig. 76). 



C. INCANUM (Binney). PI. 29, figs. 48, 49, 50. 



Shell rimate, cylindric, solid ; white, usually tinted with gray, 

 blue or fleshy ; whorls 9-12, slightly convex or nearly flat, closely 

 but lightly wrinkle-striate, the last three whorls of about equal diam- 

 eter, those above slowly tapering, forming a cone with convex out- 

 lines and obtuse apex. Last whorl somewhat ascending in front. 

 Aperture truncate-oval, white or flesh-tinted inside ; parietal lamella 

 short, rather small ; axial lamella usually well developed, tooth-like. 



