SIWALIK CROCODILIA, LACERTILIA, AND OPHIDIA. 
7—215 
Adult crania. — Of adult crania there are two specimens comprising the anterior 
portion : the first (No. 39800) is represented, of one-third the natural size, in plate 
XXIX. figs. 2, 2a ; the alveolar borders having been cut and polished in order to 
exhibit sections of the teeth. The second specimen (No. 39081), which has the 
mandibular symphysis attached, is figured in plate II. figs. 2, 4 of Cautley’s memoir 
already cited ; it agrees precisely in general characters with No. 39800. In the 
latter the maxillo-premaxillary suture is V-shaped and extends on the palate as far 
back as the hinder border of the sixth dental alveolus; the length of the facial 
aspect of the premaxillse considerably exceeds that of the external narial aperture^ 
(whereas it is always less in adult crania of G. palustris); and the centre of the 
narial aperture is consequently situated considerably behind the notch for the fourth 
mandibular tooth ; the facial sculpture is much more rugose than in the latter, this 
feature being especially marked on the extremities of the premaxillm which are 
almost smooth in the adult C. palustris ; the lateral rugose nodosities (a) on the 
maxillse are also more strongly marked than in the recent species. The width of the 
fossil cranium across the ninth tooth is 10 inches, the corresponding width in an 
adult G. palustris^ being 9 ’4 inches, and the length from the quadrate to the pre- 
maxilla 22 inches : this indicates that the fossil attained a size fully equal to that of 
C. palustris. Neither of the fossil crania show the lateral sutures on the facial aspect. 
Young crania . — One of the most beautiful examples of this form in the British 
Museum is a very young cranium with the mandible still attached (No. 40823), 
which measures rather less than four inches in length, and is in exquisite preserva- 
tion. Although some of the characteristic features are not shown, yet this specimen 
agrees very closely with the older crania noticed above ; it exhibits the sutures 
bounding the nasals, and the relative width of those bones is thus seen to be 
considerably greater than in C. palustris. The British Museum also possesses the 
right maxilla of an individual about one-and-a-half times the size of the preceding. 
Burmese specimen . — A portion of the left preniaxilla and maxilla of a crocodile 
in the Indian Museum (No. E. 34) collected by Mr. W. T. Blanford in the Siwaliks 
of Burma, apparently belongs to a subadult individual of the present species. 
Punjab crocodile . — From the Siwaliks of Asnot, Punjab, Mr. Theobald has 
collected four fragments of the skull of a crocodile (Indian Museum Nos. E. 33, 37, 
39, 40) which may very probably have belonged to the present species, although 
they are insufficient to afford a certain determination. 
Mandible . — The mandibles attached to the immature crania noticed above do 
not appear to present any characters by which they can be distinguished from 
C. palustris. The symphysial extremity of an older mandible collected by Mr. 
Theobald from the Siwaliks of the Punjab (plate XXIX. fig. 4) which may be 
provisionally referred to the present species, appears likewise indistinguishable from 
1 The length, of the premaxilla is 5’0 and that of the narial aperture 3 '4 inches ; in a suhadult cranium of 0. palustris 
(B.M. No. 68. 4. 9. 11) the corresponding dimensions are 2’2 and 2‘3 inches. 
2 The specimen figured by Gray on page 10 of the “ Supplement to the Catalogue of Shield- Reptiles ” pt. 2 (1872). 
