314 SYNOPSIS OF THE VERTEBRATE FAUNA OF THE PUERCO SERIES. 



The anterior limb is represented by parts of both uhite, part of one radius, and 

 a metacarpal of the pollex. More than half of one ulna is preserved. The olecranon 

 api)ears to be short and terminating in an acute apex at the basal border ; but it may 

 have been broken off. The humeral cotylus is oblique, extending backwards and out- 

 wards, and inwards and forwards. The i^ostei'ior border is elevated into a ridge, 

 which is convex forwards. The anterior marginal ridge is limited to the external 

 part, and it extends outwards, downwai'ds, and then backwai'ds, overhanging the 

 internal face of the ulna. The radial facet is flat, and slopes gently, and not steejily 

 inwai'ds, it is bordei'ed on the outer side by a low ridge, external to which is a longi- 

 tudinal groove. Both do not extend far distad, and the superior edge of the shaft of 

 the ulna is narrow and convex. The inferior edge is similar except below the humeral 

 cotylus, whei'e it is transversely flattened, the inferior face turning upwards on the 

 inner side posteriorly. The internal side of the shaft of the ulna is concave, and the 

 extei'nal side is convex. The head of the radius is a transverse oval, with subequal 

 bi-oadly rounded extremities. The superior border is openly shallowl}^ excavated, 

 while the inferior is obliquely beveled for the ulnar face. A short tuberosity projects 

 longitudinally from the middle of the ulnar facet. A metacarpal, supjjosed to be that 

 of the pollex, is quite short and robust and has a pi'oximal excavation of the internal 

 side for the trapezium. This concave facet extends half its length. The distal end 

 is a subround convex facet which presents outwards. It has neither median keel nor 

 groove. It indicates a robust digit. 



Measurements of Anterior Limb. M. 



Length of fragment of ulna 117 



DepUi at miildle of glenoid surface 020 



Width" " ■' ■• " 027 



Depth at coronoid 0;!2 



Ilc'iilh at middle of sliaft 0215 



I,. , , , , r fvertical 017 



i'lami'lers head oi railuis \ 



[ transverse 02G 



,,. , , r. T n,- r • , , f vcrtical 012 



Uiamelers shalt radms .04.) from pro.ximal end - 



(^ transverse 013 



Length of metacarpal of polle.x 020 



TV , r . 1 r . f , (^''^'■li<"il 013,5 



Diameters distal facet of do. \ 



[ transverse 013.5 



The femur lacks the distal extremity so that it is not possible to determine its 

 exact length. Its proximal portion is robust, and about as large as that of a fully 

 grown pig. That the animal is not fully grown is shown by the fact that the epi- 

 physis of the head is not united, although it is preserved. The projection of the 

 great trochanter is about equal to that of the head, and is robust, and truncate both 



