366 Antediluvian Zoology. 
vertebree, and is also furnished with paddles, intermediate 
between feet and fins.“ This genus exhibits the snout of a 
dolphin, the teeth of a crocodile, the head and sternum of a 
lizard, the swimmers of a whale, and the vertebra of a fish.” 
Found in the lias, Stonesfield slate, Oxford clay, Kimmeridge 
clay, coral rag or Malton oolite, and probably in ether form- 
ations. 
testoration of Ichthyosadrus comminis, by the Rev. W. D. Coneybeare, Geol. Trans., vol. i. 
The Megalosatrus, or gigantic lizard of Stonesfield and 
Tilgate Peres is computed by Dr. Buckland to be 40 ft. 
long. It possesses resemblances both to the monitors and 
the crocodiles. 
Mr. Mantell estimates the Iguanodon, the great herbivorous 
reptile of the Tilgate stene, to have far exceeded the last in 
magnitude, and to have attained the extraordinary length of 
60ft. This appears to have been an inhabitant of fr esh-water 
lakes, and rivers. 
Vertebrae of another saurian animal have lately been dis- 
covered in the Portland series at ‘Thame, near Oxford, of still 
more extraordinary dimensions. ‘They are twice as large as 
those of the Tgudnodon, and four times the size of the, ver- 
tebrze of the Mastodon. 
The Stonesfield slate contains perhaps one of the most 
remarkable assemblages of organic remains that are known to 
geologists. Here are marine, amphibious, and_ terrestrial 
animals, associated with terrestrial, fluviatile or lacustrine, and 
marine plants, and with birds and insects; all collected in a 
bed whose greatest thickness does not exceed 6 ft. 
This deposit has a singular parallel in the ferruginous sand- 
stone of Tilgate Forest, where a similar series occurs, notwith- 
standing the formations are of different periods. Here cccurs, 
blended with the bones of a gigantic species of crocodile, of 
the Megalosatirus and the Plesiosatrus, the Leptorynchus, the 
Pterodactylus, and the remains of turtles, birds, shells, and 
tropical vegetation, that extinct herbivorous reptile to which 
Mr. Mantell, at the suggestion of Mr. Coneybeare, has given 
the name of Teuanodon, from its close affinity to.the recent 
Lg:ina ot the West Indies. The great difference appears to be 
