SIWALIK CROCODILIA, LACERTILIA, AND OPHIDIA. 
9— 2ir 
the same of any form allied to C. porosus, coupled with the circumstance that the 
latter (or a closely allied form) occurs fossil in Queensland, as is shown by examples 
from Darling-Downs in the British Museum, indicates that while the C. palustris 
group from the pliocene upwards is an essentially Indian one, that of G. porosus is 
of Australoid origin and a later immigrant into India. This is quite in harmony 
with the suggestion that the C. palustris group may have been derived from the 
crocodiles of the English eocene ; and is, perhaps, confirmed by the present 
distribution of C. palustris and C. porosus ; the former according to Mr. Theobald^ 
being distributed over the whole of India and Ceylon and being comparatively rare 
in Burma, while the latter is very common in Burma and the east coast of the Bay 
of Bengal, much rarer in Bengal, and apparently absent from Ceylon. Similarly 
C. pondicherianus ^ — the other member of the C. porosus group — has been hitherto 
recorded only from the eastern coast of India. C. siamensis must probably be 
regarded as a member of the C. palustris group which has migrated from the 
neighbourhood of India. 
Distribution. — Assuming that the Punjab specimens noticed above belong to the 
present species, its range will have extended from the Punjab through the typical 
Siwalik Hills to Burma. 
Species 2. Crocodilus pal.®:indicus, Falconer.^ 
History . — The characters of this species were never defined and the name might 
therefore be treated as a manuscript one, but the writer has followed his usual rule 
of adopting Falconer’s names in almost all cases where they occur in print and can 
be identified with the type specimen. 
Type cranium. — The type cranium, which is represented in pi. XXVIII. figs. 
2, 2a, and XXIX. fig. 3, was obtained in the winter of 1836-37 by Captain George 
Fulljames from the Siwaliks of Perim Island, Gulf of Cambay, on whose behalf it 
was exhibited at a meeting of the Asiatic Society of Bengal on February 1st, 1837 ; 
and is noticed in the ‘ Journ. As. Soc. Beng.’ vol. VI. p. 79 (1837) as the skull of a 
saurian. In his “Catalogue of the Fossil Vertebrata in the Museum of the Asiatic 
Society of Bengal,”^ Falconer observes that the specimen resembles in general form 
the cranium of C. palustris^ and that it required minute and detailed comparison 
with the existing Indian species. As will be seen from the figures, the specimen, 
which appears to be subadult, is in a very fine state of preservation, and amply 
sufiicient for specific determination. 
As the specimen appears to indicate a species allied to the C. palustris group it 
will be convenient to compare it in the first place with the other members of that 
group. From the existing C. siamensis it is at once distinguished by the relatively 
narrower interorbital bar (whose length is much less than the longer diameter of the 
orbit), and the strongly marked facial sculpture. Compared with G. palustris the 
1 “ Reptiles of Britisli India,” p. 36 (1876). 
2 “ Catalogue of Rossil Vertebrata in Museum of Asiatic Society of Bengal,” p. 200 (1859). 3 Page 200. 
C 
