60 BULIMULUS-SOUTH AMERICAN. 



oval-elliptical, subangulate at base; peristome simple, unexpanded, 

 dilated above, vaultingly reflexed. Alt. 20, diam. 8J mill. ; aperture 

 10 mill, long, 5 wide. 



Santa Fe de Bogota (Gaming coll.). 



Bulimus juvenilis PFR., P. Z. S., 1855, p. 97 ; Monographia, iv, 

 p. 503. 



May be a form of B. dysoni, such as the Venezuela specimen 

 mentioned above. 



B. CACTICOLUS (Reeve). PI. 10, figs. 89, 90. 



Shell umbilicated, ovate-pyramidal, thin ; uniform dull buff; 

 lusterless ; the surface nearly smooth, but having slight growth- 

 wrinkles and fainter spirals around the top of the whorls. Spire 

 elevated conic, the apex obtuse, nepiouic whorls with fine and shallow, 

 interrupted, short-waved corrugation and faint incised spiral lines. 

 Whorls 6 J, convex ; last whorl inflated. 



Aperture ovate, rounded below, whitish-brown inside, less than 

 half the length of shell ; outer lip thin, sharp and unexpanded ; 

 columellar lip dilated. 



Alt. 32, diam. 18 mill. ; alt. of aperture 15 mill. 



Alt. 33, diam. 17 mill. ; alt. of aperture 15 J mill. 



Alt. 25, diam. 12 J mill. ; alt of aperture 13-j mill. (type). 



Ouriana, on cacti (Dyson) and on the Yaracuy River (John Hill- 

 yer), Venezuela. 



Bulimus cacticolus RVE., Conch. Icon., pi. 58, f. 393 (Jan., 1849). 

 PFR., Monogr., iii, p. 439. Otostomus (Leptomerus) cacticolus 

 Rve., MARTS., Binnenmoll. Venez., p. 31. 



B. cacticolus is the largest species of this section, and may readily 

 be known by its size, dull buff color, thin but not fragile shell, rather 

 open umbilicus, etc. The following species seems to me to be merely 

 a slender form of cacticolus, differing somewhat in the more con- 

 spicuous spiral striae. As I have not seen the type, it may stand 

 here provisionally. 



B. ERECTUS (Reeve). PI. 10, fig. 99. 



Shell openly perforate, ovate-turrited, thin, subrugate, closely 

 sculptured with spiral impressed lines, subpruinosa, pale corneous ; 

 spire erect, rather acute ; whorls 7, a little convex, the last shorter 

 than the spire, slightly compressed at base. Columella lightly arcu- 

 ate. Aperture subvertical, oblong-oval ; peristome simple, unex- 



