230 
EXPLANATIONS TO THE PLATES. 
FIG. PAGE 
131. Planorbis nitidus .218 
132. „ lineatus .219 
133. Physa fontinalis .202 
134. Conovulus denticulatus .178 
135. Snail and shell of Carychium minimum . . 177 
136. Ancylus fluviatilis .206 
137. Conovulus denticulatus, var. myosotis . . . 179 
138. „ bidentatus .179 
139. Ancylus oblongus .208 
140. Cy do stoma elegans .220 
141. Snail of Physa fontinalis .202 
142. Acme fusca .223 
143. Snail of Valvata cristata , much enlarged . . 60 
144. Snail of Acme fusca , much enlarged . . . 223 
