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revealed to us. Among these strange (because unknown) 

 forms, the Sauroid animals are, perhaps, the most remarkable. 



My principal object at present is to point out some of the pecu- 

 liarities of an animal which seems to connect the Saurian with 

 the Batrachian orders. About twenty years ago, some footsteps 

 were noticed, having a strange resemblance to the human hand ; 

 these footsteps were variously considered by scientific men, and 

 it required a series of years to determine their true character. 



Having been observed at various places, and at ditferent 

 periods, as will presently be noticed, it was proposed by Prof. 

 Owen to call this newly discovered mixture of Batrachian and 

 Saurian by the name of Labyrinthodon, from the labyrinthic 

 structure of the teeth ; though the earlier appellation of Cheiro- 

 iherium, derived from the appearance of the impressions, is 

 favored by many naturalists. A iew years after the discovery 

 of the impressions, parts of the animal, supposed to have made 

 them, became successively known ; and, lately, the discovery of 

 a large head has crowned the wishes of scientific inquirers. 

 From the occurrence of the bones in the same beds with the 

 footprints, and the consequent fact of the coexistence of the two 

 animals, and the correspondence in size between the animal and 

 the footprint, it is highly probable that the Cheirotherium and the 

 Labyrinthodon are one and the same. 



I have recently had an opportunity of obtaining a cast of the 

 largest head of this extraordinary animal, which encourages me 

 to present the effigies of a Saurian Frog of hitherto unknown 

 proportions. The head of a common frog being between one 

 and two inches in length and breadth, our wonder is naturally 

 awakened on seeing a Batrachian animal with a head from two 

 to three feet in length and breadth. If the head possess these 

 dimensions, we may suppose the whole body of the animal 

 to have been twelve or more feet in length ; and I have 

 thought it would give a more distinct impression of its character 

 to represent it at full length, necessarily supplying from the 

 imagination many parts of its extraordinary form. The figure I 

 represent is difl?erent from that of Professor Owen's. [A paint- 

 ing of the animal, twelve feet long, was displayed.] In 1828, 

 Rev. Dr. Duncan discovered in Dumfriesshire, Scotland, the first 



