90 BULIMULUS-PROTOGLYPTUS. 



B. MONTIVAGUS (d'Orbigny). PL 11, figs. 29, 30 ; pi. 14, fig. 14, 15. 



Shell much elongated, very narrowly umbilicated, thin, smooth or 

 perceptibly striated by growth-lines; spire elongated, conic, obtuse 

 at apex, composed of 9 convex whorls, separated by very deep, crenu- 

 lated sutures. Aperture small, oblong, the peristome thin, generally 

 a little reflexed ; columella straight, flat. The color is fawn, deeper 

 toward the apex ; uniform or marked longitudinally with unequally 

 spaced whitish lines. Alt. 20, diam. 7 mill. (Orb.^). 



" Caballu cuatia," Province of Entre Rios, Argentina, on moss and 

 dead leaves under trees ; valleys of the extreme eastern Andes 

 provinces of Valle Grande and Laguna, and in the Monte Grande^ 

 or great forest separating Santa Cruz de la Sierra from the Prov. 

 Chiquitos, always in poorly wooded places (Orb.) ; Corumbd, Matto 

 Grosso, Brazil, in crevices of cliffs and on walls (H. H. Smith). 



Helix montivaga ORB., Synops., Mag. de Zool., 1835, p. 14. B. 

 montivagus ORB., Voy. dans 1'Amer. Merid., p. 275, pi. 34, f. 1-3. 

 REEVE, Conch. Icon., f. 475. PFR., Monogr., ii, p. 112. 



At La Laguna, all of the specimens lacked the longitudinal whitish 

 lines. In the Prov. Entre-rios the shells were largest, and con- 

 stantly marked with unequally spaced longitudinal whitish lines. 



The form collected by Mr. H. H. Smith at Corumba (pi. 14, figs. 

 14, 15) is russet or corneous-brown, without stripes or with one or a 

 few on the last whorl. The surface is shining and shows very 

 minute spiral cuticular striae under a strong lens, the striae, perhaps, 

 very shortly pilose; whorls 8, decidedly convex, the earliest 1 

 longitudinally delicately costulate (fig. 14). Alt. 20, diam. 7; alt. 

 of aperture 7 mill. The smallest specimen I have seen measures, 

 alt. 15'2, diam. 5*8 ; alt. of aperture 5 mill. It is pale corneous with 

 widely and unequally separated oblique chestnut streaks, sometimes 

 accompanied by white streaks. 



B. CREPUNDIA (d'Orbigny). PL 11, figs. 33, 34. 



Shell elongated, turriculate, narrowly umbilicated, the umbilicus 

 in part covered by columella. Thin, appearing smooth to the naked 

 eye, but showing under a strong lens very fine, dense, transverse 

 striation, besides some growth-lines. Spire elongated, conic, the 

 apex very obtuse. Whorls 8, very convex, rounded, separated by a 

 deep suture. Color uniform ashy light fawn. 



