SIWALIK CROCODILIA, LACERTILIA, AND OPHIDIA. 
25—233 
Leptorhynchus) in the following words: “Fragment of the muzzle portion of the 
lower jaw of an enormous-sized animal, the left side (showing the empty alveoli of 
Fig. 2. Rhumphosuchus erassidens. Hinder portion of mandibular symphysis ; from the Siwalik Hills. -I- 
British Museum (No. 39803). 
the five anterior teeth, [which are] of very large size,) broken off obliquely back- 
wards ; the right side broken off nearly opposite the termination of the last alveolus 
on the left side and continued backwards (showing the alveoli of five teeth, four of 
which contain more or less of the teeth), its anterior portion wanting. 
In. 
“ Length of fragment 11 ’6 
“ Width about middle 9'5 
“Thickness 4*6 
“ The alveoli of the two first teeth are very large, the third and fourth still larger; 
the third showing a diameter of 1*8 by 1'4 inches : the sixth tooth is smaller, being 
1 inch in diameter ; the seventh is lA by 1*2 in diameter ; the eighth and ninth are 
smaller.” 
The elevated summit of the alveolus of the fourth tooth has been hammered 
off, but the section of the alveolus is considerably larger than that of the second or 
third. The first alveolus is also larger than the second, and its tooth must have 
curved rapidly upwards. The specimen exhibits very clearly the bevelling of the 
lateral borders, and the close approximation of the alveoli. A series of large 
vascular foramina runs on the inner side of the alveolar series. On the inferior 
aspect the specimen likewise exhibits a number of large vascular foramina, which 
