222—14 INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
day in Bengal, the North-West Provinces, and Akyah ; while the present writer 
possesses the skull of a specimen collected by Mr. Theobald from the Indus basin. 
In the pliocene the species occurs in Perim Island, the Punjab, and thence through 
tlie Siwalik Hills, and also in Burma ; it is unknown in the lower Siwaliks of Sind. 
Species 2. Gharialis hysudeicus, n. sp., nohis. 
History . — The type specimen of this species has been figured in “ Falconer’s 
Palseontological Memoirs.” vol. I. pi. XXIX. fig. 3. under the name Crocodilus 
fLcptorhijnchusJ leptodns^ from whicli it is widely different ; while another specimen 
was referred by Falconer in MS. to G. gangeticus. 
Hostr at portion of the skull . — In plate XXXII. figs. 1, la, lb, Ic, there are given 
three views and a transverse section of the cranial rostrum of a gharial from the 
Siwalik Hills preserved in the British Museum, which differs considerably from the 
corresponding portion of the cranium of the existing sj)ecies. The specimen has 
the hinder portion of the mandibular rostrum lying obliquely across its upper surface, 
and is so figured in “ Falconer’s Palseontological Memoirs,” vol. I. pi. XXIX. fig. 3, 
under the name of Crocodilus (LeptoidiynchusJ leptodus. Superiorly the cranial 
rostrum is broken off immediately in advance of the orbits, but on the palatal aspect 
it exhibits the anterior extremity of the palatines, and part of the palatal vacuities : 
twenty-two teeth still remain, and it is pretty evident that the rostrum was relatively 
as long as in the existing species. Compared with the cranium of the latter the 
descent from the orbit to the rostrum (pi. XXXII. fig. lb) is much more sudden and 
much greater ; so that the middle portion of the rostrum is placed relatively lower 
in respect to the parietal plane of the cranium : it is probable that the extremity of 
the rostrum was bent upwards to a small extent. As in the existing species the 
mesial j)ortion of both the cranial and mandibular elements of the rostrum is 
flattened, wliile the borders are bevelled away. The teeth agree in relative size with 
those of the existing species, and there are ten alveoli placed behind the anterior 
termination of the splenial element of the mandible. The specimen indicates an 
animal decidedly larger than the fossil race of G. gangeticus. The British Museum 
possesses another specimen (No. R. 325) from the Siwalik Hills comprising the hinder 
portion of a mandibular symphysis agreeing in all respects with the preceding 
specimen. 
Hinder part of cranium. — The hinder portion of the cranium of a gharial from 
the Siwalik Hills preserved in the British Museum and represented from the facial 
aspect in plate XXXI. fig. 3, indicates an individual somewhat exceeding in size the 
largest fossil individuals of G. gangeticus. It differs from adult crania of that species 
by the much closer approximation of the orbits, by the inferior size of the supra- 
temporal fossae, and the greater relative width of the parietal bar dividing the two 
latter, by the greater lateral expansion of the jugal and quadrate- jugal, and the 
1 In th.e plate and description the name is given simply Crocodilus leptodus, but Leptorhynchus is added on page 355. 
