Yol. 56.] 



SKELETON OF EUKYC.YRPUS OWENI. 



329* 



triangular impression, towards the median line of the vertebrae, is 

 identified as displaced dermal plates. 



The Fore-limb. (Figs. 2 & 3, pp. 329, 330.) 



The new facts concerning the fore-limb are the characters of the- 

 humerus and the impression of the superior surface of the left fore- 

 paw. 



The humerus proves to be a little more than 4 inches long T 

 2 inches wide at the proximal end, and a little wider at the 

 distal end. The inner side of the bone is concave ; the outer side is 



straighter, and both articular 



Fig 2 —Bones of the fore-limb of ends are in the same P lane - 



Eurycarpus Oweni (about £ nat. The proximal articulation^ is 



• \ convex from side to side 



above and concave below, 

 with the inner side of the 

 bone considerably thickened 

 and rounded at the terminal 

 cartilaginous surface. The 

 concavity on the underside 

 extends halfway down the 

 shaft, being bounded exter- 

 nally by the rounded ridge of 

 the radial crest, which be- 

 comes most elevated towards 

 the middle of the shaft, where 

 it terminates in the manner 

 usual in Theriodonts. The 

 foramen at the distal end on 

 the ulnar border is not pre- 

 served. The angle on the 

 superior outer border of the 

 lower third of the shaft is 

 more pronounced than in any 

 known Anomodont humerus : 

 and the lateral surface which 

 extends from this angle to the 

 radial articulation is obliquely 

 flattened for a length of 

 1 inch. The thickened flat- 

 tened inner side of the bone 

 at the proximal end is distinctive. There is no indication of the 

 characters of the underside of the distal end of the bone. The 

 shape of the bone conforms better to the Theriodont than to the 

 Dicynodont type, in which the known examples are relatively wider 

 at the distal articular end. 



The outlines of the radius and ulna are but dimly indicated 

 in the slab, as if a thin layer had scaled off and removed the 

 impression of the undersides of those bones. The distal end of the 



[The distal end of the humerus and the 

 ulna and radius here shown in outline 

 are drawn from the original slab in the 

 Natural History Museum and from a 

 plaster cast of the space between the two 

 specimens.] 



