BULIMULUS-CENTRAL AMERICAN. 55 



Aperture irregularly ovate, subvertical, about half the length of 

 the shell ; peristome thin, simple, the columella arcuate, columellar 

 margin dilated and reflexed above. 



Alt. 15, diam. 9, alt. of aperture 1\ mill. (Polvon, Nicaragua). 



Alt. 15?, diam. 8, alt. of aperture, 7f mill. (Polvon, Nicaragua). 



Alt. 14, diam. 7, alt. of aperture 6 mill. (Pfr.). 



Alt. 0-6, diam. 0'3 inch (Soivb.*). 



Belize River, British Honduras (Berendt) ; Guatemala : Retal- 

 huleu, on the lowlands of Pacific slope (Stoll) ; Escuintla, on Pacific 

 slope (Morelet) ; Zacapa, E. Guatemala, on cacti (Stoll) ; Realejo, 

 under decayed grass, N. W. Nicaragua (Cuming) ; San Juan, Castillo 

 and Toro Rapids (Gabb), and San Juan River (Tate), S. E. Nicar- 

 agua; Guanacasta, N. W. Costa Rica (Pittier) ; Puerto Viejo, on the 

 Rio Sarapiqui, N. E. Costa Rica (Biolley) ; central Costa Rica at 

 Las Palmar es,Prov. Alajuela (Orosco) ; San Jose (Biolley) ; Tilorio 

 and Zhorquin Rivers, E. Costa Rica (Gabb). 



Bulinus corneus SOWB., P. Z. S., 1833, p. 37 (published May 17, 

 1833 ; see P. Z. S., 1893, p. 436). 



Bulimus corneus PFR., Monogr., ii, p. 219 ; Conchyl. Cab., p. 242, 

 pi. 63, f. 29, 30. KEEVE, Conch. Icon., pi. 21, f. 134. ANGAS, P. Z. 

 S., 1879, p. 479. Not Bulimus corneus Lea, 1838, nor of Desh., 

 1833, Michaud,1858, or Menke, 1830. 



Bulimvlus (Leptomerus) corneus Sowb., MARTENS in Die Hel., 

 edit. 2, p. 222 ; Biol. Centr. Amer., p. 246, pi. 15, f. 9 (living animal). 

 CROSSE & FISCHER, Moll. Mex., i, p. 548. Bulimulus corneus 

 BINN. & BLD., Proc. A. N. S. Phila., 1873, p. 248. Leptomerus 

 corneus BINN., Ann. N. Y. Acad. Sci., iii, p. 124 (jaw and dentition). 

 Bulimus berendti Pfr., TATE, Amer. Journ. Conch., 1870, p. 156. 

 BINNEY, Amer. Journ. Conch., vii, 1872, p. 182 (jaw and radula). 

 Not B. berendti Pfr. 



A decidedly stouter species than B. unicolor, to which it is other- 

 wise allied. 



Var.? NUBECULATUS (Pfr.). PI. 10, figs. 69, 70. 



Shell umbilicate, ovate-oblong, rather solid arid smooth, shining ; 

 pale corneous clouded with darker ; spire conic, the apex rather 

 obtuse ; suture deep; whorls 51, convex, the last three-sevenths the 

 total alt., rotund at base; columella vertical, produced or projecting 

 at the base of the aperture. Aperture little oblique, subelliptical, 

 subangular at base, white inside ; peristome simple and unexpanded, 



