294 



FAUNA ANTIQUA SIVALENSIS. 



ponding bone in existing species of Quadrumana. It closely 

 resembles, in size and general form, tbe astragalus of the 

 Semnopithecus entellus, which we send along with the fossil 

 for comparison. 



The principal dimensions are as follows : — 



Dimensions. 



Sewalik Fossil Monkey- 

 Extreme length of astragalus . . • 1'3 inch. 

 Extreme width of body of astragalus . .I' ,, 



Length of body ...... 0-8 „ 



Greatest diameter of navicular head . . 0'65 „ 

 Thickness of ditto 0-45 „ 



Fig. 6. 



Semnopithecus entellua 



1-35 inch. 



1-03 „ 



0-85 „ 



0-65 „ 



0-5 „ 



Fig. 7. 



FOSSIX. 



EECENT. 



The chief peculiarities of the fossil astragalus, compared with 

 that of the Entellus, are these : — The upper articulating surface 

 for the tibia (a) is more convex than in the Entelhis, and less 

 square in the outline, the lateral margins (a, h) approximating 



as they run backwards ; the outer one being also more ele- 

 vated. The peroneal articulation (b) is precisely of the same 

 form and extent as in the Entellus ; and the rough fossa be- 

 tween it and the large calcanean surface (d) also corresponds. 



