260 MB. BUSK ON THE EEMAINS OF 



tions than the shaft ; and it appears to ha'se belonged to an older, or at any rate to a 

 ■more robust animal than that whose humerus has been above described. 



7, 8. Ulna. 



Two well-marked portions of the ulna of E. falconeri are contained in the collection, 

 one belonging apparently to a younger animal than the other, which from its colour 

 and general aspect would appear to appertain to the same individual as the condyloid 

 articular extremity represented in fig. 27 ; whilst the former specimen, tig. 28, in like 

 manner agrees in colour and appearance, and probably also in age, with the shaft of the 

 humerus represented in fig. 26. But, except in their colour and apparent disparity in 

 age, the two specimens exactly resemble each other ; and it is very satisfactory to lind 

 that the peculiar characters shown in them are not limited to a single indi\'idual, and con- 

 sequently that those characters cannot be regarded as accidental. The specimens are por- 

 tions of the upper end of the right and of the left ulna. The longer and more perfect 

 fragment is that shown in tigs. 28 and 28". It is about 3"'7 long, from the summit of the 

 olecranon, on which is observable a considerable part of the epiphysial surface. The shaft 

 is broken irregularly across about 2"-8 below the level of the articular surface, above 

 which the olecranon rises about l"-2. The olecranon is about V'l in transverse diameter 

 at the base, and its greatest antero-posterior diameter is nearly the same. The tran.s- 

 verse diameter of the head on the level of the articular surface is about 1"'2 or l"-3, 

 and the ap. d. at the same level 2"'2. The internal articular facet is 0""95 in its 

 widest transverse diameter, and the same in tlie antero-posterior, measured from the 

 anterior border to a Hue drawn across it at right angles from the bottom of the radial 

 sulcus. The radius of the curve of the articular facet in the antero-posterior direction 

 is 0"'9, and that of the prominent part of the articular surface on the olecranon 0"-625. 



The anterior surface of the bone is hollowed, as usual, immediately below the notch 

 for the attachment of the head of the radius; but this hollow is very ciicumscribed, 

 and immediately below it the surface is tiat from side to side, and a little lower down 

 convex. The outer surface is concave and quite smooth ; the internal, except between 

 the articular head and the olecranon, flat, or slightly convex. The internal angle is 

 rounded and smooth, and without any fossa ; the external very acute, but it does not 

 project at all in front. The adjoining ligures rep)-esent the outlines of a transverse 

 section of the shaft, in fig. 19 at about 2"-l, and in fig. 20 at about 2"-7 below the 

 level of the articular surface at the bottom of the 

 radial notch ; and the comparison of these with 

 the outline of a transverse section of the shaft 

 of E. melitensis at a rather lower point (p. 246) 

 will serve to show how closely in form they all 

 resemble each other. In other res])ects also the 

 ulna oi E. falconeri, save in size, appears to agree ^a. j>.a 



