INDEX. 241 
Planorbis rhombeus, 215. 
spirorbis, 215. 
vortex, 214. 
Pomade and syrup of snails, 115. 
Pond snails (Limnea), 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, 2b. 
— Angelica, 155. 
—— muscorum, 154. 
—— secale, 157. 
—— umbilicata, 153. 
—— vestuta, 153. 
R. 
Radiating lines on shells, 45. 
Reflected lp 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. ef 
Reversed shells, 45. g 
f 
S. ‘4 
Scoop for collecting, 19. 
Secretion of colour in shells, 46. 
Seomentina lineata, 219. 
Sense of hearing and sight in bivalves, 17 ; water-breathing 
snails, 52. 
R 
