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Cabinet at Florence, it appears that there exists, in that cabinet, not 
only two of the molar teeth of the hippopotamus, but a fragment also 
of one of the tusks, or canine teeth of the lower jaw. Teeth of the 
hippopotamus, of different kinds, it appears, have been found scat- 
tered in several parts of the upper Vale of Arno. 
Remains of the hippopotamus have been found, I am informed, in 
some parts of Gloucestershire. Mr. Trimmer has kindly communicated 
to me the information, that the remains of these animals are found in the 
stratum of blue clay at Brentford; and has also kindly communicated the 
following account of the strata, as they there occur. The first stratum 
is nine feet of sandy loam, or common brick earth, in which no fossils 
are found. 2d. Seven feet of gravelly sand, becoming so coarse, as to 
deserve to be called sandy gravel. At the bottom of this stratum are 
found the remains of hippopotami and of elephants ; but they are not 
found in those parts to which the next stratum does not extend : to 
which, therefore, they may be more properly considered as belonging. 
3. From one foot to nine, of an earth highly calcareous, in which are 
found the horns, bones, and teeth of deer, with many small shells. 4. 
A few feet of gravel, with water. 5. Two hundred feet of blue clay, 
in which are found pyritified fruits and wood, with marine fossils, 
particularly nautili, which are found at all depths in this stratum. 
In my visits to Walton, in Essex, I have been successful in ob- 
taining some remains of this animal. The most interesting of these 
specimens are — 
1. An incisor tooth of the right side of the lower jaw. This tooth 
has lost much of its enamel, but is otherwise in good preservation, 
possessing all its characteristic markings. It measures fifteen inches 
and a half in length, and nine inches in circumference towards its 
base, and is of course too large to be figured in these plates. 
2. The point of an inferior canine tooth or tusk, measuring full nine 
inches in circumference, and having seven inches in length of triturating 
surface. From the great size of this tooth, it is very likely to have 
