BULIMULUS-CENTRAL AMERICAN. 51 



a. Small species, alt. less than 20 mill. 



b. Very slender ; diam. less than half the alt. ; aperture about 

 one -third alt. inermis. 



bb. Stouter; diam. and aperture not far from one-half the alt. 

 c. With delicate epidermal spirals. 



d. A chestnut band above sutures on spire, 



coriaceus. 



dd. Uniform flesh-colored, sarcodes. 



cc. No perceptible spiral sculpture, umbraticus, vnicolor, 



corneus. 



aa. Larger species, alt. 23-27 mill. ; diam. and aperture slightly less 

 than one-half the alt. ; spire straightly conic, dysoni. 



B. INERMIS (Morelet). PI. 10, fig. 87. 



Shell narrowly and profoundly umbilicated, elongate- conic, rather 

 thin, minutely striated, a little shining; covered with a very thin, 

 pale, brownish-corneous epidermis. Spire long, the apex rather ob- 

 tuse; suture profoundly impressed. Whorls 7, little convex, the 

 two embryonal smooth and corneous, the last much shorter than the 

 spire, attenuated at base, rounded ; columella nearly straight, whitish. 

 Aperture acuminate-oval, colored like the exterior ; peristome sim- 

 ple, the terminations separated, columellar margin vaultingly re- 

 flexed, partially covering the umbilicus, basal and outer margins 

 acute. Alt. 9, diam. 4 ; alt. of aperture 3, width H mill. (<7. & F.}. 

 Environs of the toivn, Palizada, Yucatan (A. Morelet). 



Bulimus inermis MOREL., Testacea Noviss., ii, p. 10 (1851). 

 PFR., Monogr., iii, p. 441 ; iv, p. 506 ; vi, p. 153. Bulimulus (Lepto- 

 merits) inermis CROSSE & FISCHER, Miss. Sci. Mex.et Amer. Centr., 

 p. 550, pi. 20, f. 16, 17. MARTENS, Biol. Cent. Amer., p. 241. 



One of the smallest Central American species, further remarkable 

 for its elongation, the aperture being only one-third the total alt. 

 Crosse & Fischer's description and figures, given above, are from 

 Morelet's types. I have not seen the species. 



A var. major, alt. 13, diam. 6, alt. of aperture 5 mill., from N. 

 Guatemala is mentioned by v. Martens. 



B. CORIACEUS (Pfeiffer). PL 10, figs. 79, 80 (77, 78, berendti). 



Shell perforate, ovate, thin, light brown, the whorls of the spire 

 with a chestnut band above the sutures, fading on its upper margin ; 

 apex purple-brown or brown. Surface lusterless except just in 

 front of aperture, showing under the lens faint growth wrinkles and 



