462 
G. J. DE FEJÉR VARY 
Agamians, however, e. g. Chlamy dosaurus, a slight swelling of the ulno¬ 
palmar angle produces a feeble concavity of this side of the bone, and the 
articulating surface extending upon the elevation obtains therefrom a 
little curvature. In the Varans the prominence of the angle becomes 
a conspicuous and distinctive character, related to the greater develop¬ 
ment in size and function ot the pisiform bone articulated with 
it, consequently to the needful power of the manus in these heavy¬ 
bodied climbers and deep ovipositors ; the general form of the 
articulating surface is now lunate or reniformi, but its ulno-palmar end 
on which plays the pisiform is in some species — V. varius for 
example — determined as a separate facet by a more oblique and com¬ 
paratively flattened surface. This facet and the bold prominence on which 
it is seated are well-marked features of the fossil bone. As in Varanus the 
protuberance ends abruptly proximad ; on its radial side it sinks deeply 
to the general level of the head, from which again rises a coarsely sculptured 
tuberosity occupying the whole of the radio-palmar angle ; a tubercular 
surface similarly placed is seen in Varanus, but in much less prominence, 
and with, of course, much less pronounced separation from the articular 
head. 
The proximal surface corresponding to the greater sigmoid cavity 
is a basin of remarkable breadth for the reception of the much-dilated 
ulnar condyle of the humerus to which it is further conformed by its unusual 
shallowness. On its free sides it is bordered by a broad and rough lip over¬ 
hanging the shaft on the ulnar side, and at its proximal end surpassing 
the height of the olecranon. The shape and extent of the surface for the 
head of the radius is obscured by the loss of the coronoid process, but it 
seems not to have reached quite so far towards the olecranon as in Varanus. 
The olecranon itself scarcely differs in form and degree of development 
from that cf V. varius . The brachialis anticus is upon a rough oval tubercle 
placed with the same obliquity to the long axis of the bone as in Varanus. 
The massive ruggedness of the bone throughout bears testimony to the 
great power and almost mammalian activity of investments during life». 
The measurements are, according to Mr. de Vis (p. 96), the 
following : 
Length 258 mm. 
Breadth at proximal end 82 mm. 
«The ulna is from an individual one-third larger than the sometime 
owner of the humerus» (1. c.). This bone is, according to de Vis (1. c.), 
«4 times as long and 6 times as broad as that of V. varius.)) 
3. Fibula. Mentioned in de Vis (op. cit. p. 94), though no 
description and no figure is added. 
