HELICID^. 51 



Anciua^ Albers, 1860. Shell rimate, ovate-conical, thin, striate, 

 white, strigate with brown ; whorls seven, rather flat, the last 

 compressed in front ; aperture narrowl}- oblong, vertical, peris- 

 tome shorll3' reflected, the margins parallel. B. anchistoma, 

 Wagner (xcviii, 29). Brazil. 



Afeaembrinus, AllDcrs, 1850. Shell subimperforate, or perfor- 

 ation covered, oval-conic, longitudinally striate or a little rugose; 

 whorls six or seven ; aperture oval-oblong ; columella subtortu- 

 ous ; peristome simple, sharp ; columellar lip more or less dilated, 

 reflected. B. virgulatus, Fer. (xcviii, 30). 81 sp. Lower Cali- 

 fornia, Mexico, Florida, W. Indies, Central and So. America. 



Mormus^ AllDers, 1860. Shell rimate, oblong-conical, striate 

 or costulate, thin, white, usuall^^ fuscously variegated ; whorls 

 six or seven, the upper ones somewhat flattened, the last rather 

 tumid ; aperture about half the length of the shell, subovate ; 

 peristome simple, the columellar margin dilated and reflected. 

 B. papyraceus^ Mawe (xcviii, 32). 43 sp. L. California, Mexico, 

 Central and South America. 



Scutanis, Albers, 1850. Shell perforated or umbilicated, 

 oval-conic, striated, granulated, somewhat hirsute ; whorls 

 4-'!, the last ventricose, somewhat narrowed at the base; 

 aperture oblong-oval; peristome expanded, usually reflected, a 

 little thickened within. B. thamnoicus^d^Orh. (xcviii, 33). 28 sp. 

 L. California to So. America. 



Pyrgus, Albers, 1850. Shell turreted ; whorls nine, the last 

 being a third of the total length ; aperture oval ; jDcristome 

 simple, thin ; columellar lip reflected above. B. turritus^ Brod. 

 Peru. 



Ataxus, Albers, 1850. Shell umbilicated, oval-conic ; whorls 

 six, the last compressed and angular around the umbilicus, which 

 is very large ; aperture narrow, oblong, subangular at the base, 

 about one-third the length of the shell ; peristome simple ; lips 

 closely approaching at their extremities ; columellar lip straight, 

 expanded above. B. umbilicaris, Soul, (xcvii, 21). 5 sp. So. 

 America. 



Eurytus^ Albers, 1850. Shell imperforate, thin, oval-oblong; 

 whorls four or five ; aperture rather longer than the spire, 

 oblong-oval ; columella arcuated ; peristome snbreflected ; lips 

 united by a thin callus. B. Cathcartiae^ Reeve (xcviii, 25). 38 

 sp. South America. 



Oxycheilus, Albers, 1S50. Shell thin, pellucid, shining, sub- 

 imperforate, subfusiform, apex acute ; whorls six or seven ; 

 aperture oblong-oval, shorter than the spire ; columella nearly 

 straight, slim ; peristome simple ; columellar lip reflected. B. 

 Hanleyi^ Pfr. (xcvii, 17). Brazil. 



Peronseus, Albers, 1850. Shell perfoi'ated or fissured, oblong- 

 turreted or subulate ; whorls 8-11, convex; aperture oblong or 



