INDEX. 
241 
Planorbis rhombeus, 215. 
-spirorbis, 215. 
- vortex, 214. 
Pomade and syrup of snails, 115. 
Pond snails (Limnsea), characters of, 184; food of, 185 ; 
species and geological distribution of, 186. 
Posterior margin , 11. 
Preparation of lingual ribbons for microscope, 49. 
Preserving bivalves, 20; slugs, 90 ; land snails, 98. 
Protozoan animals, 2. 
Pulmoniferous animals, 3. 
- snails (class Pulmonifera), 65. 
Pupa, characters of, 152; synoptical list of species of, 153 ; 
geological distribution of, ib . 
- Anglica, 155. 
- muscorum, 154. 
- secale, 157. 
-umbilicata, 153. 
- vestuta, 153. 
R. 
Radiating lines on shells, 45. 
Reflected lip of shells, 45. 
Reproduction of bivalves, 18; of water-breathing snails, 
52 ; of land snails, 94. 
Respiration in bivalves, 15 ; in water-breathing snails, 52 ; 
in air-breathing snails, 65 ; in Ancylus fluviatilis , 207. 
Reversed shells , 45. 
S. 
Scoop for collecting, 19. 
Secretion of colour in shells, 46. 
Segmentina lineata, 219. 
Sense of hearing and sight in bivalves, 17 ; water-breathing 
snails, 52. 
