MOLAR TEETH AND OTHER REMAINS OE MAMMALIA. 
21 
Rhinoceros sumatrensis, now inhabiting the same regions of Asia. The measure- 
ments of the penultimate upper molar of Rhinoceros sumatrensis are-— 
In. 
External side 
Internal side 
Anterior side 
Posterior side 
2-0 
1- l 
2 - 0 
1-6 
These measurements indicate a tooth rather smaller, but having the same rela- 
tive dimensions as that of the Irawadi species. 
In addition to the molar teeth described above, I have discovered, in the Indian 
Museum among some bones brought from Pegu, some years ago, portions of the 
occiput of a species of Rhinoceros ; these have been placed in the their relative posi- 
tions and drawn {plate 5, Jig. 3) with an approximate outline of tbe whole 
occiput. Erom the large size of the fragments, and from the locality in which they 
were found, as well as from the difference of their form from tbe occiputs of either 
of Ealconer’s three species of Siwalik Rhinoceros, I have no doubt but that they 
belonged to the large Rhinoceros iravadicus of Burma. 
The fragments consist of two detached portions of the occiput, as shown in the 
figure ; one of these comprises the left half of the lower portion of the occiput, with 
the condyle, partly broken on its lower border, of the same side. The second frag- 
ment consists of the central portion of the upper half of the occiput, showing the 
crest or superior curved line, and the depressions for the attachment of the cranio- 
cervical .muscles ; a small portion of the parietals between the temporal fossae, with 
parts of the latter, are also attached to the specimen. I cannot be quite sure 
whether the relative positions of the two fragments are rightly placed in the figure 
or not ; I made the interval between the summit of the condyle and the summit 
of the occiput equal to two and a half times the long diameter of the former, 
this being the average interval between the two points in the skulls of such species 
of Rhinoceros as I have had an opportunity of observing. As the specimen is in 
too imperfect a condition for exact description, I have given its measurements below, 
and then compared it with the figures of the occipital regions of the three Siwalik 
species figured in the Eauna Sivalensis ; — 
Long diameter of condyle (partly broken) ... ... ... 3'6 
Short ditto ... ... ... ... ... ... 2*4 
Width of occiput above condyles ... ... ... ... 13'5 
Width of upper fragment ... ... ... ... 7'0 
Height of ditto ' ... ... ... ... ... 5 
Width of parietals 14 inches in advance of occipital crest ... ... 1*8 
Height from lo\^er border of occipital foramen to crest (?) ... ... lO’lO 
Between external angles of condyles ... ... ... ... 6*3 
Height of foramen magnum ... ... ... ... 2 '4 
Erom Rhinocet'os sivalensis and R. palceindicus, this specimen is at once dis- 
tinguished by its greatly superior size ; the interval between the lower border of 
( 39 ) 
