CONTENTS. 



Dates of issue of the parts of Vol. XVIII ii 



Classification of the Achatinida3 v 



Geographic distribution of the Achatinidee vi 



Anatomical and systematic notes on the Stenogyrinas . . . . vii 



Descriptions of Genera and Species. 

 Subfamily STENOGYRIN,E, continued. 



Genus BACILLUM Theobald 1 



TORTAXIS Pilsbry 5 



PLICAXIS Sykes 12 



PROSOPEAS Morch 14 



PERRIERIA Tapparone Canef ri 36 



HYPOLYSIA Melvill and Ponsonby 37 



EUONYMA Melvill and Ponsonby 38, 339 



CURVELLA Chaper 46, 340 



SUBULINA Beck. Old World species 71 



American species 220 



ZOOTECUS Westerlund 104, 340 



PSEUDOPEAS Putzeys. Old World species 114 



Subgenus Eremopeas Pilsbry 120 



American species 216 



Genus OPEAS Albers 122 



Old World species. 123 



Section Tomopeas Pilsbry 123 



Comoropeas Pilsbry 123 



American species 188 



Genus TRISTANIA Boettger 217 



LUNTIA E. A. Smith 218 



TORN AXIS Martens 219 



SYNAPTERPES Pilsbry 227 



(ni) 



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