x ILLUSTRATIONS. 
A Lime-sponge with the living flesh . . . 44 
Spicules of flint-sponges . . . . . , . .45 
Sarcode or flesh of a flint-sponge with the spicules ... 46 
Venus' Basket. The skeleton of a flint-sponge ... 47 
Cup-sponge growing at the bottom of the sea .... 48 
Fresh -water hydra hanging from duckweed . . . .51 
Lasso-celis of the Hydra and Sea- Anemone .... 53 
The Sea-Oak, Sertularia ....... 56 
The Campanulina, an animal-tree giving off" jelly-bells . . 59 
A jelly-fish, Chrysoara hysocella . . . . . .63 
The childhood of the same jelly-fish . . . . .65 
Section of a Sea- Anemone showing its parts ... 67 
Group of Sea- Anemones . . . • . . .68 
Growth of Red Coral . . . . . . . .72 
A section of a piece of Red Coral . . . . . • 73 
A piece of White Coral ....... 74 
The Devonshire Cup-Coral, Caryophyllium Smythii • • 75 
The infancy of a Feather Star-fish . . . . . .78 
The infancy of a Brittle Star-fish . . . . . .79 
The infancy of the common Star-fish ..... 80 
The infancy of a Sea-Urchin . . . . . , .81 
The infancy of a Sea-Cucumber ...... 82 
The common five-fingered Star-fish and the Brittle Star-fish • 84 
Section of the centre and of one ray of a Star-fish • . .85 
The life of a Feather- Star . 90 
A Sea-Urchin walking on a rock . . . ... 94 
A Sea-Urchin with its spines rubbed off . . . . .95 
An Oyster (Ostrea edulis) lying in the shell, showing the gills, 
mouth, etc. ......... 108 
A group of headless Mollusca, Cockle, Mussel, Scallop, and Razor-fish in 
Mollusca with heads, Vegetable-feeders, Limpet and Periwinkle 114 
The anatomy of a Periwinkle 115 
Flesh-feeding Molluscs, Whelk and Cowry . . . ,118 
Garden Snail, Great Grey Slug, and Testacella . . .122 
Naked-gilled Mollusca or sea-slugs, Doris pilosa and Eolis coronata 124 
Oceanic Mollusca, Ianthina^ Carinaria, and a Pteropod . .125 
Octopus shooting backwards through the water . . .127 
The Mother Argonaut floating in the water . . . .132 
Land- Leeches of Ceylon racing to attack some creature . .143 
Section of a Leech showing the nervous system . . .144 
