CONTENTS. 



Family BULIMULID^K (continued). 



Genus Bulimuhis Leach (continued), ..... 1 

 Subgenus Plectostylus Beck, . . . . . 2, 317 

 Subgenus Scutalus Albers, . . 12,317 



Subgenus Bulimulus, s. str., 35, 319 



Subgenus Rhinus Albers, ...... 74 



Subgenus Hyperaulax Pilsbry, . . . . .82 



* * * 



Subgenus Protoglyptus Pilsbry, 84 



Subgenus Nsesiotus Albers, ...... 94 



Subgenus Orthotomium Crosse & Fischer, . . 125 



Section Plicolumna Cooper, . . . . .151 



Subgenus Sonorina Pilsbry, . . . ... .155 



Genus Neopetrceus von Martens, 163 



Genus Oxychona Morch, 181 



Genus Drymanu Albers, ....... 182 



Subgenus Zaplagius Pilsbry, 185,320 



Subgenus Drymseus s. str., including Mesembrinus . . 191 



Section Stenostylus Pilsbry, 313 



Explanation of plates, 323 



[NOTE. The North American and Autillean species of Dry- 

 imeus, and the subgenus Liostracus, will be included in vol. XII.] 



