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XL Description of the Anatomy of the Onfithorhynchus 
Hystrix. By Everard Home, Esq. F. R. $ . 
Read June 3, i8og. 
At the time I had the honour of laying before this learned 
Society, an anatomical description of the Ornithorhynchus para- 
doxus, (see page 67,) I did not attempt to point out any quadru- 
peds as being nearly allied to it, there being none at that time 
within my knowledge; but the discovery of another of the same 
tribe, which is the subject of the present Paper, enables me to 
trace one step further, in the gradation between that extraor- 
dinary animal and the more perfect quadruped. 
. The subject from which the following description was taken, 
was sent from New South Wales, preserved in spirit! It is a 
male, and had arrived nearly at its full growth, as the epiphyses 
were completely united to the bodies of the bones, which is not 
the case in growing animals. 
A description and figure of this animal is given by Dr. Shaw, 
in his Zoology, under the name of Myrmecophaga aculeata . 
Description of the external Appearances . 
The animal is 17 inches long, from the point of the bill to 
the extremity of the tail: the bill is if inch long, and the tail 
half an inch. 
The body of the animal is nearly of the same general thick- 
