AND CROC. MARGINATUM. 



485 



somewhat resembling the form of G. palustris of the Ganges. 

 There is also a marked constriction behind the twelfth tooth, 

 considerably greater than in G. vulgaris. The largest teeth 

 are the third, the fourth, and the tenth, the last being the 

 largest of all. The nasal aperture is more circular than in 

 C. vulgaris. There is no lower jaw to the Belfast specimen. 

 Plate XXXVIII. figs. 4, 5, and 6, represent the cranium, 

 viewed from the top, palate, and side, as in G. cataplir actus} 

 The dimensions of the cranium are as follow : — 



Dimensions 



Length of cranium from trie point of the muzzle to the 

 occipital ridge ........ 



Length of cranium from the point of the muzzle measured 

 to condyle of the upper jaw . 



Extreme width of cranium at the condyles . 



Length from occipital ridge to base of nasals 



Length from the point of the muzzle to base of nasals 



Length of orbit ...... 



Width of orbit 



Interval between orbits .... 



Antero-posterior diameter of crotaphite foramen 



Transverse diameter of crotaphite foramen 



Width of the muzzle at the last tooth 



Width of the muzzle at base, of the nasals . 



Width at contraction behind the twelfth tooth 



Width at the tenth tooth .... 



Width at the ninth tooth .... 



Width at contraction behind the fourth tooth 



Greatest contraction behind fifth tooth 



Dilatation of the point of the muzzle . 



Length of the nasal aperture 



Width of the nasal aperture 



Length of intermaxillaries on the palate 



Length of mamillaries on the palate . 



Antero-posterior diameter of palatine foramen 



Transverse diameter of palatine foramen . 



C. cata- 

 phr actus 



In. 



155 



17- 



7- 

 6' 

 9- 

 1-8 

 1-4 

 ■8 

 11 



2-8 



2- 

 1-1 



■75 

 3- 

 6-3 



C. niargi- 

 natus. 



In 

 16 



19 



8 

 6 



10 

 2 

 2 

 1 

 1 

 1 

 6 

 6 

 4 

 6 



1 Part of the above description, taken 

 from Dr. Falconer's Note-books, was 

 published in vol. i. (p. 356), before I 

 was aware of the existence of the above 

 memoir. In reference to three species 

 of Crocodiles of the Ganges mentioned 

 at p. 355 of vol. i., C. bombifrons, ac- 

 cording to Dr. Falconer, occurs in the 

 northern branches of the Ganges, 1,000 



miles from Calcutta ; C. biporcatus ap- 

 pears to be confined to the estuary ; and 

 C. palustris to range from the estuary 

 to the central parts of Bengal. The 

 Gavialis found along with C. bombifrons 

 in the North, and descends to the region 

 of C. biporcatus in the estuary. (See 

 Sir C. Lyell's ' Principles of Geology,' 

 10th ed. 1867, p. 473.)— [Ed.] 



