148 ME. E. T. NEWTON ON THE EEMAINS OE A 



outer side of this bone (PL XXIX. fig. 12, fib.) there is a rough and somewhat pro- 

 jecting portion, which begins about 2 \ inches above the bridge and extends upwards 

 for about 1^ inch. This rugosity seems to be the attachment for the lower end of the 

 fibula. The form and direction of the ridge, which passes upwards from the inner side 

 of the bridge, is clearly shown, as well as the manner in which the bone recedes from 

 the outer side of the tendinal groove. This fragment of a tibio-tarsus is intermediate 

 in size between the two first mentioned, and consequently represents a third individual. 

 The specimen is chiefly interesting because it gives us the form of that part of the tibio- 

 tarsus which is wanting in the other examples, and enables one to restore the outline 

 of the bone, as is done in figure 2, where the restored parts are only lightly shaded. 



The fourth portion of a tibio-tarsus was found with the femur described below, and 

 is too much crushed to allow anything to be said as to its form. On one side the 

 upper half of the fibular articulation is shown, and beyond this the bone is continued 

 upwards for about three inches, but is still imperfect. 



The fifth portion of a tibio-tarsus is represented by two pieces (PI. XXVIII. fig. 4). 

 These two fragments evidently belong to the same bone ; but the intermediate parts 

 are wanting. The manner in which the lower end of this bone was denuded and 

 rounded before being fossilized, as well as the porous and laminated nature of the 

 bone of the shaft, seemed to indicate that it was not fully ossified, and when com- 

 paring the large tibio-tarsi with those of Binomis in the British Museum, the 

 immature tibia? of that genus attracted my attention, and gave the clue to what 

 appears to be the correct interpretation of this specimen. The close resemblance 

 between our specimen and the lower end of the immature Binomis tibia (B. M. 

 no. 47,444) leaves little room for questioning its being of a similar nature. There 

 are minor points of difference, but only such as one would expect in birds which were 

 not specifically identical. Of course in this early condition the bridge is not ossified, 

 nor indeed are any of the prominent adult characters yet developed. Provisionally, 

 therefore, this bone is regarded as a very young tibia of the same species as the larger 

 bones above described. 



Femur. Two pieces of a femur (PI. XXIX. figs. 13-15), representing perhaps 

 rather more than half the entire bone, were found either in the " Blue Clay " (f ), or 

 in one of the " Lignite-beds " (</), and the dark carbonaceous matter, infiltrated with 

 iron pyrites, which adheres to the surface of the bones makes it most probable that 

 they came from the latter. The interior of this femur is filled with a close network 

 of cancellated bone, now covered with crystals of iron pyrites. One of the pieces is 

 the proximal four inches of a left femur, including the greater part of the head with 

 the articular surface and front part of the trochanter, the upper part having been 

 denuded. The second piece of this femur consists of about three inches of the shaft a 

 little above the condyles ; it does not join the proximal piece, two or three inches of the 

 shaft being absent ; but there is little doubt as to their being parts of the same bone. 



