BULIMULUS-PROTOGLYPTUS. 91 



Aperture quite large, oval, the borders thin and acute, noticeably 

 reflexed ; columella straight, inflated in the middle of its length. 

 (Orb.). 



Alt. 25, diam. 10 mill. 



Near Mission of San Jose, southern part of Prov. Chiquitos, Bolivia* 

 on the ground or under dead leaves (Orb.). 



Helix (Cochlogena) crepundia ORB., Mag. de Zool., 1835, p. 14. 

 Bulimm crepundia ORB., Voy., p. 275, pi. 33, f. 18, 19. PFR., 

 Monogr., ii, p. 173; iii, 412; iv, 471 ; vi, 114. Buliminus crepun- 

 dius BECK, Index Moll., p. 71. Bulimus constrictus REEVE, C. 

 Icon., pi. 47, f. 307. i?. redditus REEVE, ibid., in addenda..' Bulimus 

 crepundia PARAVICINI, Boll. Mus. Zool. ed Anat. Comp. Univ. 

 Torino, ix, no. 181, p. 7. 



Most nearly allied to B. montivagus, but the size is double, the 

 form wider, mouth rounder, columella inflated, and especially dis- 

 tinguished by the spiral strise. 



The subgeneric position is uncertain. Pfeiffer gives the following 

 diagnosis : 



Shell profoundly rimate, subperforate, turrited, oblong, thin, 

 nearly smooth (very minutely decussated when seen under the lens),, 

 diaphanous ; brownish-ashen. Spire lengthened, the apex somewhat 

 obtuse. Whorls 7 -8, convex, the last about equal to two-fifths the 

 total alt., a trifle compressed at base. Columella somewhat receding. 

 Aperture a little oblique, oval ; peristome simple, unexpanded ; colu- 

 mellar margin dilated and wide. Alt. 22, diam. 9 mill. ; aperture 9 

 mill, long, 41 wide inside. (Pfr.). 



B. RIVASII (d'Orbiguy). PI. 12, figs. 40, 41. 



Shell long-conic, turriculate, with a wide and deep umbilicus ; 

 thin, smooth, translucid, grayish-brown, ornamented with longitudi- 

 nal lines of brown. Spire rather short, conic, acute. Whorls 8, 

 very little inflated, short ; suture not impressed. Aperture oblong, 

 subangulate ; lip thin, acute ; columella straight, angular in front. 

 Length 19, diam. 8 mill. (Orb.). 



Cuesta de Petaca, and the ravines along the Rio Grande, eastern 

 foothills of the Bolivian Andes, under stones (Orb.). 



B. rivasii D'ORB., Voy. dans FAmer. Merid., p. 276, pi. 34, f. 8- 

 10. PFR., Monogr., ii, 155 ; iv, 406. ? REEVE, Conch. Icon., pi. 

 20, f. 122. 



