SIWALIK CROCODILIA, LACERTILIA, AND OPHIDIA. 
13—221 
a few of the more important may be noticed. No. 36726 comprises the hinder part 
of the cranium and mandible of an adult ; No. 39089 likewise belongs to an adult 
and consists of the hinder part of the cranium only, it is figured of one-third the 
natural size in plate XXX. fig. 2^ ; No. 36727 is the hinder part of the cranium of 
a half-grown individual, and has a portion of the mandible attached. The larger 
of these specimens somewhat exceed in size the largest recent gharial skull in the 
British Museum, but agree precisely in every detail : — thus the supratemporal fossae 
are relatively large, and separated by a narrow bar, the bar of bone forming their 
posterior border being also narrow ; the orbits are very widely separated, and the 
intervening frontal bar is deeply concave. In the Indian Museum (No. E. 25) there 
is the hinder part of a half-grown cranium from the Siwalik Hills, described by 
Falconer on pp. 165-6 of his “Catalogue of Fossil Vertebrata of Asiatic Society of 
Bengal.” The British Museum possesses the hinder half of a large adult cranium 
(No. 40695), as well as a smaller specimen, from the Siwaliks of Perim Island ; and 
there is the hinder half of a young cranium from the same locality in the Indian 
Museum (No. E. 188). All these specimens agree with recent examples and with 
those from the Siwalik Hills. Of the rostral portion of the cranium the British 
Museum possesses several specimens from the Siwalik Hills ; the one represented in 
plate XXX. fig. 3 belongs to a subadult individual, while the larger one represented 
in fig. 1 of the same plate^ from the frontal aspect belongs to a fully adult individual, 
and comprehends the rostral portion of both the cranium and mandible. The 
specimen of the premaxillse of an immature individual represented in plate XXX. 
figs. 4, 4a was obtained by Mr. Theobald from the Siwaliks of the Kangra district ; 
and there are other less perfect specimens in the Indian Museum from the Punjab. 
All the foregoing examples exhibit the straight rostrum and the terminal expansion 
of the premaxillae so characteristic of the recent form. The hinder part of the 
rostrum of a very large specimen from the Siwaliks of Burma preserved in the 
Indian Museum (No. E. 21) apparently belongs to the present form. 
Mandible . — The terminal portion of the right half of a mandibular symphysis 
from the Siwalik Hills represented in plate XXX. fig. 5 shows the characteristic 
lateral expansion at the second tooth. A less complete specimen in the Indian 
Museum (No. E. 19), belonging to the opposite side, as well as specimens from the 
Punjab (No. E. 20 j exhibit the same feature. 
Teeth . — The crown of a tooth from the Siwaliks of the Punjab, agreeing 
precisely with the teeth of the specimen drawn in fig. 1, is represented in plate 
XXX. fig. 6. It may be observed that the teeth of the gharial are slightly 
compressed at right angles to the two longitudinal ridges, and are set in the jaw 
with these ridges directed transversely ; the dental alveoli having their transverse 
diameter rather longer than the antero-posterior. 
Distribution . — According to Mr. Theobald^ the gharial is found at the present 
1 Also figured (j') in “ Falconer’s Palaiontological Memoii-s,” vol. I. pi. XXVIII. figs. 4, 5. 
2 Figured from the ventral aspect in “ Falconer’s Palaeontological Memoirs,” vol. I. pi. XXIX. fig. 5. 
D 
