148 BULIMULUS. 



quite visible in the middle. Spire produced, oblong-turrited. 

 Whorls 8 to 9, slowly increasing, convex ; suture impressed ; last 

 whorl subcylindric-oblong, tapering at the base. Aperture somewhat 

 oblique, sinuate-oblong, angular above, on the right side and especi- 

 ally at the base effuse and expanded. Columella contorted, the base 

 generally receding towards the left, a little thickened. Peristome 

 acute, the margins remote, no callus joining them. 



Length 22, diam. 7^, length of the aperture 8J mill. 



Length 18, diam. 7-^, length of the aperture 7^ mill. (Ancey). 



Bolivia: Caiza, Gron Chaco (Dr. Borelli). 



Bulimulus montivagus var. chacoinsis ANC., Boll. Mus. Zool. ed 

 Anat. Comp. R. Univ. Torino, xii, no. 309, p. 16 (Nov. 30, 1897). 



Differs from montivagus by being imperforate, with the columella 

 twisted. The apical whorls are finely costulate, and in quite fresh 

 specimens traces of fine spiral lines may be seen on the later whorls. 



B. POLLONER^E Ancey. Vol. XII, PI. 4o, fig. 30. 



Shell pyramidal, almost imperforate, deep reddish-brown, and 

 usually decorated with some narrow, suboblique, darker streaks ; 

 rather thin, silky-shining, slightly glossy ; covered with a thin cuticle, 

 which under the lens is seen to be ornamented with elevated, mem- 

 branaceous lines, evanescent and very fine at the last whorl. Spire 

 conoid-tapering, the apex acute. Whorls 7J, slowly increasing, con- 

 vex, suture impressed; last whorl wider, rounded, somewhat oblong. 

 Aperture distinctly oblique, angular above, suboval, somewhat effuse 

 below. Columella a trifle twisted above; peristome simple, acute, 

 hardly effuse except along the columellar margin, reflexed over the 

 very minute umbilical chink. Length lo^, diam. G^, length of 

 aperture 5| mill. (Anc.). 



Argentina : San Lorenzo, Province of Jujuy (Dr. Borelli). 



Bulimulus pollonera ANC., Boll. Mus. Zool. ed Anat. Comp. xii, 

 no. 309, p. 17, pi., fig. 10 (Nov. 30, 1897). 



Close to B. montivagus, but of a darker, purple-brown color, the 

 aperture less oblong, etc. 



B. TRICHODKS (Orb.). Vol. xi, p. 92. 



Ancey reports this species from San Lorenzo, Prov. Jujuy Argen 

 tina, from Caiza in the Gran Chaco, and the mission of San Fran- 

 cisco, on the upper Pilcomayo, Bolivia, collected by Borelli. The 



