EXPLANATION OF THE PLATES. 



311 



Table X. 



1 14. Valvata piscinalis, 97. 



115. cristata, 98. 



116. var., 17. 



117. minuta, 17. 



118. Paludina vivipara, and 



operculum, 90. 



119. Paludina achatina, 91. 



120. Bithinia tentaculata, and 



operculum, 93. 



121. " Paludina similis," 94. 



122. " viridis," 95. 



123. " stagnorum," 95. 



124. Neritina fluviatilis, 83. 



125. Ancylus fluviatilis, 249. 



126. Velletia lacustris, 250. 



127. See Tab. XI. 



128. Bithinia ventricosa, 94. 



Table XI. 

 27.* Helix Carthusiana, var. 



thin, 146. 

 28.* Helix rufescens, var. al- 



bida, 157. 

 101. a. Limnaeus pereger, var. 

 lineatus, and reversed 

 var. 234. 

 101. b. Limnaeus pereger, var. 



lacustris, 234. 

 101. c. Limnaeus pereger dis- 

 torted, 

 101. d. Limnaeus pereger, var. 



acutus, 234. 

 110.* Physa fontinalis, var., 

 251. 



127. Assiminia Grayana, and 



magnified, 86. 



128. See Tab. X. 



129. Helix aperta, with epi- 



phragma, 127. 



130. Helix hybrida, 132. 



131. obvoluta, 139. 



132. limbata, 143. 



133. revelata, 152. 



134. sericea, 153. 



Table XII. 



135. Helix concinna, 154. 

 135.* depilata,- 155. 



136. Zonites nitidulus, 172. ' 

 136.* Var. Helmii, 173. 



137. radiatulus, 173. 



138. excavatus, 175. 



139. See Plate VI. 



140. Vertigo cylindrica, 200. 



141. alpestris, 202. 



142. (Not to be procured.) 



143. Clausilia dubia,and mouth 



magnified, 216. 



144. Conovulus denticulatus, 



225. 



145. Conovulus bidens, 227. 



146. albus, 227. 



147. Amphipeplea involuta, 



245. 



148. Planorbis laevis, 261. 



149. Pisidium obtusale, 282. 

 150. 

 151. 

 152. 



nitidum, 283. 

 pulchellum, 284. 

 cinereum, 286. 



