Next above the new red sandstone comes the lias, the general direction of the inclination of the beds being the same as in the coal-cliff, and the newer beds covering up the old ones as we advance in the direction of the larger islands. The lias animals are here represented by three very dissimilar forms; there are three species of _Ichthyosaurus_, or Fish Lizard; three species of _Plesiosaurus_, or Serpent Lizard, and a crocodilian beast called _Teleosaurus_, which much resembles the fish-eating Gavial of the river Ganges. This crocodile and the fish lizards formerly inhabited the neighbourhood of Whitby in Yorkshire, where their remains are found in good condition. Dr. Buckland describes the _Plesiosaurus_ as the most singular and monstrous of the relics of the former world, having the head of a lizard, the teeth of a crocodile, a neck like the body of a serpent, the trunk and tail of an ordinary quadruped, the ribs of a chameleon, and the paddles of a whale. The next formation in ascending order is the oolite. To this stratum, as well as to the succeeding one, belongs the _Megalosaurus_, or Gigantic Lizard, which measures 39 feet from snout to top of tail, and 22 feet 6 inches round the body, and the smaller Pterodactyles. Still proceeding to the left, we pass next to the Wealden formation so well known in Kent, Surrey, and Sussex. Here we see the gigantic _Iguanodons_, and the _Hylæosaurus_, or Great Spiny Lizard of the Wealden. It is with these creatures that the name of the late distinguished palæontologist, Dr. Mantell, will ever be connected, since to his labours in Tilgate Forest and other parts we are indebted for our knowledge of these animals. Above the Wealden formation come those of the lower greensand and the chalk. Both of these also contain fragments of singular reptiles of large size, the _Mosasaurus_ and great Pterodactyles (most probably the fabled dragon of old) restored from Mr. Bowerbank’s specimens.