4 
A. Smith Woodward—On the Genus Anomaodus. 487 
_ The above figures show the left fore and hind feet of Ooryphodon 
and Dinoceras all seen from in front. The feet-of the two genera 
as exhibited have many points in common, and their positions 
during life were probably nearly the same. The feet of Coryphodon 
are older in point of time. Those of Dinoceras are near to Cory- 
phodon in their general structure, but the points of resemblance 
need not be enumerated here. 
The existing Elephant, as well known, has all the toes of each foot 
enclosed in a common integument, but is really digitigrade. In 
Dinoceras, the terminal phalanges are much larger, showing that 
they themselves bore a greater weight, the digits being undoubtedly 
free, although a pad may have helped to support the foot. ‘In 
Coryphodon, the digits were still more elongate, and the terminal 
halanges proportionately larger and broader, somewhat like those 
of the Rhinoceros, indicating that they were covered with hoofs that 
supported the feet. This would agree with the position given them 
in the restoration, which coincides with the anatomical structure of 
the entire hind limb. 
II.—Some Cretaceous Pycnopont Fisuas. 
By A Smita Woopwarp, F.L.S., F.G.8. 
(Continued from page 436.) 
2.—On THE Genus Avouaobus, with REMARKS ON THE STRUCTURE 
OF THE PycNoDONT SKULL. 
(PLATE XVII.) 
[{\HE only important fragment of a Pycnodont fish hitherto known 
from the English Cretaceous Formations, is the portion of head 
and trunk figured and briefly noticed by Dixon under the name of 
Gyrodus angustus, Ag.' This specimen displays the splenial bones 
from the oral aspect; some of the vertebral hemapophyses; and 
thick scales with a reticulated ornament, covering only the anterior 
half of the trunk. The ventral ridge-scales also exhibit very con- 
spicuous serrations. The splenial bones are imperfect, but sufficient 
to show all the essential characters of their oral face; and these 
elements present the only unique feature in the specimen. It will 
be observed that, whereas in all Pycnodont splenials hitherto 
described the dentition reaches the outer border at least in part of 
its extent, the bone in Gyrodus angustus has a wide toothless outer 
margin and an attenuated knife-like edge. The two vacuities in this 
margin shown in Dixon’s figure are partly due to accident, partly 
imaginary, and there is no doubt that the bone forms a continuous 
whole. 
Now, it is obvious from the specimen just described, that the fish 
in question cannot be assigned to the genus Gyrodus ; for it differs 
both in the arrangement of the teeth and in the absence of scales 
1 F. Dixon, ‘Geology and Fossils of Sussex’’ (1850), p. 370, pl. xxxiii. fig. 1. 
See also Smith Woodward, Proc. Geol. Assoc. vol.-x. (1888), p. 307. 
