236 INDEX. 
Helix aspersa, monstrosities of, 112; perforations of lime- 
stone by, 117 ; poetical allusions to, 2b. ; hybernation 
of, 118 ; amours of, 119. 
— Cantiana, 126. 
— Cartusiana, 127 ; confinement to chalk of, 2b. 
caperata, 125. 
concinna, 129. 
— ericetorum, 141. 
— fruticum, 145. 
— fusca, 131. 
hispida, 129. 
— hortensis, 121 ; food of birds, 122. 
——- incarnata, 145. 
lamellata, 133. 
—— lapicida, 140. 
nemoralis, 120 ; jaw of, 2b. ; varieties of, 121. 
obvoluta, 141. 
— Pisana, 123. 
— Pomatia, 134 ; jaw of, 2b. ; hybernation of, 135; growth 
of shell of, 2b. ; experiments on, 136. 
—— pulchella, 138 ; jaw of, ab. ; variety of, 139. 
—— pygmea, 144, 
—— revelata, 132. 
—— rotundata, 142. 
—— ruderata, 145. 
— rufescens, 128. 
——. rysa, 146. 
—— sericea, 130. 
virgata, 123 ; showers of, 124 ; eaten by sheep, 20. 
Hinge of shells, 10. 
Hinge-line, 12. 
Hybernation of snails, 97, 135. 
Hydrobia marginata, 146. 
similis, 64. . 
—— ventrosa, 64. 
