'igO PHILOSOPHICAL TRANSACTIONS. [aNNO 3 758. 



what was then thought to have been fins, near the back part of the head at a, 

 the same as appeared further backward at e, when this design was made. The 

 vertebras, &c. now wanting having been either dug up by curious persons, or 

 washed away by the violence of the waves at high water, and the accidental beat- 

 ing about of stones, sand, &c. daring that time; the water covering this skeleton 

 several feet at high water in spring tides; the cavities in the rock still remaining 

 as in the design. 



. The substance of the bones, with their periosteum, on the covered or under 

 side, in most parts remain entire, and their native colour in some places in a 

 good measure preserved, and the teeth with their smooth polish plainly to be 

 discovered. Part of the mandible near the extremity was covered with a shelf of 

 the rock about 3 inches thick; which being cut away and removed, both the 

 mandibles appeared under it complete, with the teeth of the upper and under 

 one, plainly locking or passing by each other. These appeared to be of the 

 dentes exerti or fang kind, as well as all the others in the narrow part of the 

 mandible, and farther backwards they were not observed. From this ledge or 

 shelf the mandible towards b is single, and appears to be the upper one of the 

 living animal ; and from the head not being exactly in the line of the body, that 

 part has been inverted, or quite turned over, and the body itself, as appears from 

 the transverse processes of the vertebrae, lies on the right side. There appears 

 one row of teeth only on each side of the mandible, and they are about 4 of an 

 inch asunder. 



The m.andible ba, the cranium gh, and the vertebrae from d to p, were at- 

 tempted to be taken up whole; but the bones being rendered extremely brittle, 

 and the rock in which they were fixed being a brittle blackish slate, with joints 

 or fissures running in every direction, would not hold together : the whole there- 

 fore fell in many pieces, the vertebrae in the joints only, which makes them easy 

 to join together again, and besides shows very plainly the transverse and spinal 

 processes, with the foramen in the latter for the spinal marrow. It was 

 now that a piece of the os femoris, about 4 inches long, showed itself in 

 the sparry concreted substance at e, together with a piece of the os innomi- 

 natum, to which it had been articulated or joined. This, with what has been 

 before remarked, will sufficiently prove this to have been an animal of the qua- 

 druped, and probably, from the shape of the cranium peculiar to fishes, of the 

 amphibious kind. At the same time many pieces of the costae or ribs, as broken 

 and crushed up against the vertebrae were plainly visible. The cavities of all the 

 bones were filled with a substance, which appeared the same as the rock itself; 

 and the substance on each side the vertebrae, as they lay, was a mixture of sparry 

 concreted matter with that of the rock itself, which is a blackish slate. The 

 animal, when living, must have been at least 12 or 14 feet long. And the di- 



