ILLUSTRATIONS. 435 



Page. 



116. Animal of Strobilops .• 505 



117. Jaw of Strobilops 505 



118. Dentition of Strobilops 505 



119. Strobilops labyrinthica 506 



120. Strobilops virgo 506 



121. Strobilops affinis 507 



122. Animal of Acanthinula harpa 507 



123. Jaw of Acanthinula harpa 507 



124. Dentition of Acanthinula harpa 508 



125. Acanthinula harpa 508 



126. Jaw of Pupoides marginatus 508 



127. Dentition of Pupoides marginatus 508 



128. Pupoides marginatus , 508 



129. Animal of Bifidaria tappaniana 509 



130. Jaw of Bifidaria tappaniana 509 



131. Dentition of Bifidaria tappaniana 509 



132. Bifidaria armifera 510 



133. Bifidaria contracta 510 



134. Bifidaria corticaria 511 



135. Bifidaria pentodon 512 



136. Bifidaria tappaniana 512 



137. Animal of Pupilla muscorum 513 



138. Jaw of Pupilla muscorum 513 



139. Dentition of Pupilla muscorum 513 



140. Pupilla muscorum 513 



141. Pupilla muscorum unidentata 513 



142. Pupilla muscorum bigranata 513 



143. Animal of Vertigo 514 



144. Jaw of Vertigo ovata 514 



145. Dentition of Vertigo ovata 514 



146. Apertural folds in Vertilla 515 



147. Vertigo milium 515 



148. Vertigo ovata. 516 



149. Vertigo morsei 516 



150. Vertigo ventricosa 517 



151. Vertigo gouldii 517 



152. Vertigo bollesiana -. . . 518 



153. Vertigo tridentata 518 



154. Animal of Cochlicopa lubrica 519 



155. Jaw of Cochlicopa lubrica 519 



156. Dentition of Cochlicopa lubrica 519 



157. Cochlicopa lubrica 519 



158. Jaw of Vallonia pulchella 520 



159. Dentition of Vallonia 520 



160. Vallonia pulchella : 520 



161. Vallonia excentrica 521 



162. VaUonia costata 521 



163. Animal of Carychium exiguum 522 



164. Jaw of Carychium 522 



165. Dentition of Carychium exiguum 522 



166. Carychium exiguum 522 



167. Carychium exile 523 



168. Carychium exile canadense 523 



Plate I. Census of recorded distribution of Michigan Terrestrial Mollusca, Septem- 

 ber 1, 1906 524 



39 



