xii INDEX TO VOLUME X. ILLUSTRATIONS. Frontispiece. Dredging up Brood Oysters in the Colne Folding-table of the Distribution of the Non-Marine Mollusca of Essex to fact page 108 Map showing area of damage Storm of June 24th, 1897, 114 Plan of Pleshey Earthworks, 156 Plans of Ancient Earthworks, 157 Plan of Old Sarum, 158 Brightlingsea Harbour, 168 Seven Illustrations to Prof. Boulger'; paper on Symbiosis, 177—3 Mouth of the Colne, Evening, 224 Entrance to the Pyefleet Creek, 225 Plate. The Pyefleet, where the "Natives" are fattened, Evening, to face page 227 View on Mersea, Showing Entrance to Blackwater Estuary, 228 Cliff Subsidence at Walton-on-Naze, 236 Two Folding Tables, Epping Fores Entomostraca, to face pages 260 and 272 Fish-hooks made of Thorns, used on Essex Coast, 303 Phyllodic Aberration of Primrose, 307 Hybrid between Primula elatior and P. veris, 309 Implement of Stag's Antler, from Wormingford, Essex, 311 Ceriodaphnia scitula, 315 Acroperus harpae- and variety, 318 Diaptomus vulgaris, 323 Cyclops bistriatus, 325 Chisel-shaped bone, used for Barking Birch-trees, Normandy, 352