go Sir Everard Home on the fossil hones of an animal whose 
the first bone of the posterior fin, should the animal have 
had one ; but till bones like those of the pelvis are found, 
this cannot be determined. It is engraved in Plate III. that 
it may be generally known, and by that means its place in 
the skeleton will be sooner ascertained. 
The bones of the pectoral fin of the fossil skeleton, bear 
no resemblance to those of the onithorhynchus, but have some 
faint likeness to those of the pectoral fin of the shark. The 
bones of the pectoral fin of the ornithorhynchus correspond 
with those of the same fin in the whale tribe, turtles, the bones 
of the wings in birds, and of the fore leg of the quadruped. 
It would appear from the variety that occurs among the 
different specimens which have come under my observation, 
that the fossil bones met with at Lyme, not only belonged 
to animals of different sizes, but of different species. I am 
led to this opinion from Mr. Delabeche having sent me 
two sets of the bones of the pectoral fin which evidently 
belonged to the same animal, in which the small bones of the 
paddle are set on to the long bone in a manner somewhat 
different to what it is in the others. 
