232—24 INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
mentioned, the fourth lower tooth is larger than the adjacent ones ; but from the 
imperfect protrusion of the ninth lower tooth it is not apparent whether the fossil 
agreed with the living Toniistonia in having this tooth larger than those adjacent to 
it. The majority of the mandibular teeth are subequal in size, and considerably 
smaller than those of the upper jaw. 
Craniam . — The British Museum possesses the middle portion of a cranium from 
the Siwalik Hills evidently belonging to the present species, of which a profile view is 
given in the accompanying woodcut (fig. 1). This specimen consists of the portion of 
Fig. 1 . Ehamphosuchus crassidens. Profile view of the midlde portion of the 
cranium; from the Siwalik Hills. British Museum (No. 39804). 
the cranium from the middle of the orbits to the middle of the rostrum, and measures 
twenty-two inches in length, with a maximum width of eleven inches. Its most 
remarkable feature is the perfect straightness of the profile, there being no descent 
from the orbit to the rostrum, and the former lying very nearly in a horizontal 
plane. Tomistoma makes a nearer approach to the fossil in this respect than is made 
by Gharialis gangeticus ; but the feature is more like that of some of the true cro- 
codiles and alligators. The dental alveoli are subequal in size, and placed close 
together ; pits for the reception of the tips of the mandibular teeth occur on the 
inner side of the maxillary alveoli. There is a more decided sculpture than in G. 
gangeticus. 
The British Museum also possesses part of a crocodilian quadrate and quadrato- 
jugal from the Siwalik Hills which from its enormous size evidently belongs to the 
present form. 
Mandible . — Besides the mandibular rostrum attached to the type specimen there 
are two other portions of mandibles from the Siwalik Hills which may be referred 
to the present form. The first specimen^ is in the British Museum, and is figured 
from the palatal aspect in the accompanying woodcut (fig. 2) ; it comprises the hinder 
moiety of the symphysial portion, and shows the anterior termination of the 
splenial element fsp.). The alveoli of sixteen teeth remain, and these are placed 
close together, and at some distance from the lateral borders of the symphysis. 
There is a distinct bevelling of the lateral borders, and the alveoli are subcylindrical, 
and of nearly equal size. 
The second specimen is in the Indian Museum, and is figured from the palatal 
aspect in plate XXXIII. fig. 3. It is described by Falconer^ (under the name of 
1 The specimen is figured in “ Falconer’s Palseontological Memoirs,’’ vol. I. pi. XXIX. fig. 2, as part of the cranium. 
2 “ Catalogue of Fossil Vertebrata of Asiatic Society of Bengal,” pp 166-1C7, No. 652 (1859). 
