XXVJ11 



XXVII. Trochus 



XXVIII. Turbo 



f Pyramidella 209 



J Solarium 214 



I Rotella 215 



Trochus 216 



Monodonta (some) 219 



Turbo (some) 220 



Cerithium (some) 226 



f Pu pa 179 



Clausilia 180 



Auricula (some) 186 



Cyclostoma 188 



Planorbis (some) 190 



Paludina 196 



Scalaria 211 



Delphinula 213 



Trochus (some) 216 



Monodonta (some) 219 



Turbo 220 



Turritella 224 



XXIX. Helix 



Helix 169 



Carocolla 175 



Anostoma 176 



Helicina (some) 178 



Pupa (some) 179 



13uJimus 181 



Succinea 185 



Auricula 186 



Cyclostoma 188 



Planorbis 190 



Lymnaea 192 



Melauia 193 



JMelanopsis 194 



Paludina (some) 196 



Valvata 196 



Arupullaria 197 



Natica , .. 202 



Janihina 203 



Sigarctus 204 



