The Paying‐out Machinery on Board the _Great Eastern_ 104 The _Great Eastern_ Laying the Atlantic Cable 109 Foraminifera in Piece of Rock 112 Propagation of an Infusorian by Spontaneous Division 113 Inhabitants of the British seas Kondylostoma Patens (magnified 300 times) 113 Medusæ 116 Praya Diphyes 117 Agalma Rubra (three‐fifths natural size) 120 Physalia Antarctica 121 Madrepores 124 Sea Anemones 125 Star‐fish 128 Urchins in a Rock 128 Sea Cucumber (_Holothuria tubulosa_) 128 The Razor Fish (_Solen ensis_) 129 The Mussel (_Mytilus edulis_) 129 Isolated Piles covered with the Spawn of Mussels 132 Oysters (_Ostrea edulis_) 133 Dredging for Oysters 137 The Scallop (_Pecten_) 140 The Limpet (_Patella_) 140 Spondylus 140 Turbo 141 Trochus 141 Voluta 141 Conus 141 The Cowrie (_Cypræa tigris_) 141 Strombus 144 Murex 144 Triton 144 Harpa 145 Purpura Lapillus 145 Cleodora 145 The Octopus (_Octopus vulgaris_) 148 The Common Nautilus (_Nautilus pompilius_) 149 Crabs (_Cancer pagurus_) _To face page_ 153 “The West Indian Land Crab (_Gecarcinus ruricola_) 153 The Hermit Crab (_Pagurus Bernhardus_) 156 Lobster (_Homarus vulgaris_) and Prawns (_Palæmon 157 serratus_)