Mr. Clift on the Megatherium. 449 



Ft. In. Lines. 

 Tibia. 



The greatest length along the middle line 1 10 



Circumference of the head of the tibia, over the anchylosed head of the fibula. . 2 11 



Smallest circumference of the tibia at its middle 1 2 2 



Circumference of the lower extremity of the tibia and fibula over the malleoli . . 2 6 3 



Length of the interosseous space 7 1 



Greatest breadth of ditto 3 6 



Breadth of the superior articulating surface of the tibia 11 9 



Breadth of the inferior articulating surface 8 3 



Breadth of the tibia and fibula at the lower end 1 6 



Astragalus. 



Its greatest breadth 9 



Its greatest height 9 



Os calcis. 



Greatest length on its inferior surface 1 5 



Circumference around its anterior extremity 2 4 9 



Circumference immediately behind the last measured part 1 6 



Circumference behind its middle 1 7 3 



Thence the os calcis gradually tapers to a point backwards. 



Os naviculare. 



Its greatest breadth 6 6 



Its greatest length ; 4 6 



Os cuhoides. 



Its greatest diameter 5 



With regard to the relative dimensions of the Madrid skeleton, and the 

 specimen under consideration, on comparing a few of the most certain mea- 

 surements with those given in a Table constructed by the late justly revered 

 M. Cuvier*, from an admeasurement of the figures published by Messrs. 

 Pander and D'Alton, which are professed to be drawn on a scale of one tenth 

 of the natural size (for, neither Bruf, Garriga, nor Pander having taken the 

 pains to give the real dimensions of the bones in feet and inches, the ad- 

 measurements in the Table of the various parts can only be expected to be 

 approximations), — some of the bones in the present specimen are, according 

 to those calculations, somewhat less; but the greater number of our measure- 

 ments exceed those of the corresponding parts in the Madrid skeleton ; con- 

 sequently, it is fair to infer that the present specimen was, of the two, the 

 older, and somewhat larger individual. From a manuscript memorandum in 



* Ossemens Fossiles, vol. v. Part I. p. 191. 



t M. Bru, from whose description and drawings M. Garriga constructed his work. 



