BULIMULUS-SOUTH AMERICAN. 59 



B. BUENAVISTENSIS Pilsbry, n. n. PL 10, fig. 95. 



Shell small, narrowly umbilicated, ovate-conic, thin, light corneous- 

 brown. Surface luster less, to the sight and touch like velvet with 

 excessively short pile ; the growth lines inconspicuous, but showing 

 under the lens very fine raised cuticular spirals throughout, subregu- 

 larly and very closely placed. Spire conic, the apex obtuse, the 

 earlier If whorls, very densely, finely granose in zigzag-wrinkled 

 pattern. Whorls 5i, moderately convex, the last yrith the appear- 

 ance of being subangular in front of aperture, but there is almost 

 no actual angle. 



Aperture slightly oblique, elliptical, narrowed above and below, 

 colored like the outside, a trifle less than half the shell's length ; 

 peristome thin, acute and unexpanded, outer lip quite regularly 

 arcuate, in profile view its upper fourth seen to be produced for- 

 ward ; columella straight, the columellar margin dilated above. 



Alt. 11'4, diam. 6'3 ; alt. of aperture 5 -4 mill. 



Buenavista, Colombia (T. R. Peale). 



Bulimus corneus LEA, Trans. Amer. Philos. Soc., vi, 1836, p. 66, 

 pi. 23, f. Ill (June, 1838 ; see Proc. Amer. Philos. Soc., i, 1838, p. 19) ; 

 Observations on the Genus Unio, etc., ii, p. 66, pi. 23, f. Ill (1838). 

 Not Bulimus corneus Desh., 1836, nor of Sowerby, 1833. 



Lea's figure and measurements were from a larger specimen 

 (" length 0'7 of an inch ") than that preserved in his cabinet, from 

 which my description and figure are drawn. 



It is not, as PfeifFer stated with doubt (Monogr., ii, p. 219), a variety 

 of B. unicolor, differing radically from that species in sculpture; and 

 it is equally distinct from other small species of northwestern S. 

 America and Central America, none of which have the characteristic 

 cuticular spirals of Lea's B. corneus. Among the Antillean species 

 B. diaphanus has more prominent growth- wrinkles ; and in B. houel- 

 montensis the body-whorl is much more oblong and the sutures 

 deeper. 



Type is No. 105078 U. S. Nat. Mus. 



B. JUVENILIS (Pfeiffer). Unfigured. 



Shell perforate, ovate-fusiform, thin, lightly striatulate, hardly 

 shining, pale reddish-corneous. Spire long-conic, the apex rather 

 acute. Whorls 6, but slightly convex, the last a little shorter than 

 the spire, obsoletely subangulate in the middle, the base attenuated ; 

 columella somewhat straightened, a little receding. Aperture oblique, 



