XIV 



LIST OF ILLUSTRATIONS 



Various Forms of Limn&a, 



Ramshorn Snail (Planorbis), 



Circulation in Pleurobranchus, 



Acanthodoris spinosa, 



Ancula cristata, 



Tethys leporina, 



Dendronotus arborescens, 



Phyllirhoe bucephala, 



JEoli&ia papillosa, . 



Elysia viridis, 



Limapontia capitata, 



Synapta digitata with parasitic Entoconcha 



Larva of Entoconcha, 



Acera bullata, 



Philine aperta, 



Sea- Hare (Aplysia), 



Pleurobranchus peroni, 



Larva of Pneumoderma, 



Clione, 



Cavolinia tridentata, 



Larva of Cavolinia, 



Gleba cordata, 



Animal of Periwinkle, 



Textile Cone, 



Black Olive, 



Teeth of Whelks, . 



Section of Whelk, . 



Animal of Murex, . 



Egg-Capsules of Purpura, 



Rhizochilus, 



Helmet- Shell (Cassis), 



Tun-Shell (Dolium), 



Fig-Shell (Pyrula), 



Money-Cowries, 



Wing-Shell (Strombus), 



Pelican's Foot (Aporrhais) 



Worm-Shell ( Vermetus), 



Spawn of Periwinkle, 



Horned Winkle (Lacuna), 



Rissoa, 



Viviparous Pond- Snails, 



Teeth of Vivipara, 



Star-Fish with Thyca, 



Violet Sea-Snail, . 



A Pelagic Heteropod (Pterotrachea), 



Atlanta peroni, 



Freshwater Nerite, 



Dolphin- Shell ( Delphinula), 



Under Surface of Limpet, 



Common Chiton, . 



Larva? of Chiton, . 



Eyed Chiton, 



Common Tooth-Shell, 



Section of Animal of Dentaliurn 



