Page:Land Mollusca of North America (north of Mexico) Vol. I Part 1 i-276.pdf/5

 *New Families, Subfamilies, Genera and Subgenera Defined in Volume I
 * New Species, Subspecies and Formae Defined in Volume I, Part 1
 * INTRODUCTION: Measurements and Colors — Illustrations — Types — References — Stages of growth — Species and Subspecies — Genera — Synoptic Key to new Genera of Part II
 * SYSTEMATIC TREATMENT
 * Family I. Helicidae
 * Genus Helix
 * Subgenus Helix, s.s.
 * Subgenus Cryptomphalus
 * Genus Cepaea
 * Genus Otala
 * Genus Helicigona
 * Genus Theba
 * Family II. Helicellidae
 * Genus Hygromia
 * Subgenus Trichia
 * Genus Monacha
 * Genus Helicella
 * Subgenus Trochoidea
 * Genus Cochlicella
 * Family III. Helminthoglyptidae
 * SUBFAMILIY CEPOLIINAE
 * Genus Cepolis
 * Subgenus Hemitrochus
 * SUBFAMILIY HELMINTHOGLYPTINAE
 * Genus Monadenia
 * Genus Helminthoglypta
 * Subgenus Helminthoglypta s.s.
 * Subgenus Charodotes
 * Genus Micrarionta
 * Subgenus Micrarionta s.s.
 * Subgenus Eremarionta
 * Subgenus Xerarionta
 * Subgenus Plesarionta
 * SUBFAMILIY SONORELLINAE
 * Genus Sonorella
 * Subgenus Sonorella s.s.