ME. ST. G. MIVAET ON THE SKELETON OP THE PRIMATES. 211 



This proximal surface resembles that of the homotypal metacarpal one more in the 

 Orang than in the other and superior forms; but it may be readily distinguished by 

 the less inclination distad of its upper part, and by the large articular facet for the 

 entocuneiform (PI. XLIII. fig. 37 ii. a). 



On the peroneal side of the bone there are two articular facets for the third meta- 

 tarsal (PI. XLIII. fig. 43 S, b'), which are sometimes connected at theii- proximal ends 

 by a very small vertical articular surface for the ectocuneiforme. 



As in Troglodytes, the tibial articular siu-face (for the entocuneiforme) in the Orang 

 is relatively larger than it is in Man (PI. XLIII. fig. 42). 



There is a more or less marked tubercle at the proximal end of the plantar surface of 

 the bone, between the articular suj-face for the entocuneiforme and that for the meso- 

 cuneiforme. 



Third Metatarsal. (Plate XLIII. figs. 44-47). 



The proximal surface of the third metatarsal of the Orang is less concave than that of 

 man, and is, indeed, partially convex, as also in the Gorilla. It is more notched on its 

 tibial side (PI. XLIII. fig. 37 in.) than in the just-mentioned forms, by a deep groove, 

 which divides the two articular facets for the second metatarsal. In the Gorilla the 

 lower facet appears to be waniing. 



On the peroneal side of the bone (PI. XLIII. fig. 47) there are two distinct facets, 

 instead of one as in Man and the Gorilla. These are divided by a groove, which, 

 however, scarcely invades the peroneal margin of the proximal surface. This surface 

 may be distinguished from the homotypal one in the manus by its becoming much 

 narrower downwards and by the absence of a marked concavity on its upper part. 



Fourth Metatarsal. (Plate XLIII. figs. 48-51). 



In the Orang, as in the Gorilla, the proximal surface of this metatarsal is destitute 

 of the concavity which exists in Man, and is besides much more convex. 



Its inferior margin is straighter than in Man or the Gorilla, and the tibial side of the 

 bone (PI. XLIII. fig. 50) has two articular facets for the third metatarsal, instead 

 of one as in them. These facets are separated by a wide and deep groove. The 

 peroneal side of the bone (PI. XLIII. fig. 51) has one long surface (for the fifth 

 metatarsal) which is more vertically extended than in INIan or the Gorilla. Compared 

 \\dth the homotypal surface of the manus, the proximal one of this metatarsal is more 

 convex, the convexity extending on the peroneal side up to the dorsum, instead ot 

 being interrupted by a concavity as in the manus. 



Fifth Metatarsal. (Plate XLIII. figs. 52-54). 

 The fifth metatarsal of Simia has a proximal surftice which is both more convex 

 vertically and concave tranversely than that of the Gorilla, and still more so than tliat 



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