92 BULIMULUS-PROTOGLYPTUS. 



In form allied to montivagus and crepundia, but distinguished by 

 the angular aperture, shorter spire and entirely smooth texture. 

 {Orb.). 



The form described by Reeve is certainly a marked variety. It 

 is described as follows. 



VAR. PL 12, fig. 46. 



Shell acuminately oblong, thin ; whorls 8, convex, aperture rather 

 small, lip simple. Opaque-white, with longitudinal transparent 

 horny streaks and lines. Alt. 19i mill. (Reeve). 



Near Chilon, Bolivia, under dead trunks of cacti (Bridges). 



Pfeiffer describes B. rivasii as follows : Shell narrowly umbil- 

 icated, ovate turrited, rather solid and smooth ; pale corneous, with 

 sparse streaks of chestnut. Spire pyramidal, rather acute, whorls 

 7 -8, a little convex, narrow, the last a little over one-third the 

 length of shell, somewhat compressed at base. Columella a trifle 

 receding. 



Aperture slightly oblique, oblong-oval ; peristome a mere trifle 

 expanded, the outer lip arcuate above, then a little straightened ; 

 columellar lip dilated and wide. (Pfr.). 



Alt. 18*, diam. 8 mill. ; alt. of aperture 7* mill. 



B. TRICHODES (d'Orbigny). PI. 12, figs. 49, 50, 51, 52. 



Shell openly perforate, ovate-elongate, thin, striatulate-granulate, 

 beset with very short hairs, corneous, ornamented with close whitish 

 longitudinal lines ; spire lengthened, the apex acute. Whorls 8, a 

 little convex, the last nearly equalling two-fifths the length of 

 shell. Aperture oblong-oval, the peristome simple, acute, right 

 margin expanded a little, columellar margin vaulted, reflexed, wide ; 

 columella straight, a little receding. Length 20, diam. 9 mill. ; 

 aperture 82 mill, long, 4 wide in the middle. (Pfr.). 



Santa Cruz de la Sierra, Bolivia, in gardens (Orb.). 



Helix trichodes ORB., Mag. de Zool., 1835, p. 12. Bulimus tri- 

 chodes ORB., Voy., p. 277, pi. 33, f. 1-5. PFR., in Conchyl. Cab., 

 p. 150, pi. 39, f. 12, 13 ; Monogr., ii, p. 112 ; iii, p. 347 ; iv, p. 413 ; 

 vi, p. 58. REEVE, Conch. Icon., pi. 75, f. 547. Buliminus trichodes 

 BECK. Bulimus crepundia REEVE (not Orb.), Conch. Icon., pi. 

 47, f. 300. 



Apical sculpture unknown. Orbigny considers it closely allied 

 to B. montivagus and B. crepundia, from which it differs in the less 



