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glenoid cavity, which, from its much smaller size, is in- 
dicative of its having belonged to a young individual. 
These bones were not, as is usually the case, dispersed 
and fractured, but confined to the limited space of a few 
yards ; thus affording presumptive evidence that the animals 
had not been drifted from a distance in detached portions 
and separately embedded in the sedimentary deposit ; for, on 
the contrary, I observed that the vertebral column of one 
individual extended in a line across the trench, the ribs 
appeared to have been in situ, the pelvic bones and head were 
contiguous, as well as some of the bones of the extremities, 
and from their position, I should conjecture the animal to 
have been lying upon its side. The bones of the feet are 
comparatively few, and the caudal vertebrae are entirely 
missing. This, however, may have arisen from their 
size not being sufficient to attract the attention of the work- 
men in the first instance ; and subsequently, upon re-temper- 
ing the clay, only a few meta-tarsal bones have been detected, 
and some of these only within the last three weeks. When it 
is borne in mind, however, that nearly a year and a half has 
elapsed since the clay was first dug, and that it has since laid 
exposed in the brick-yard, it is only surprising that any of the 
bones have been preserved to this day, to attest the fact 
that the Hippopotamus was once an inhabitant of the 
valleys and plains of the West Riding of Yorkshire. 
That the extinct Hippopotamus was equal, if not superior, 
in size to the species now inhabiting the rivers of Africa, is 
evident from a comparison of some of the bones and teeth 
in the two species. The great median incisor, or canine 
tusk, found at Wortley, measures 18 inches in length 
by 21 inches in breadth ; and the straight incisor of the 
lower jaw, 12 inches by If inches ; while the former tusk in 
a fine recent skull of a mature animal in the Museum of the 
Leeds Philosophical Society, measures only 15 inches in 
