crocodilid^:. 55 



Crocodilus sivalensis, Lydekker \ 



This species is probably the ancestor of C. palustris, from which 

 it is distinguished by the wider interorbital bar, the longer facial 

 surface of the premaxilla, the greater posterior convexity of the 

 maxillo-premaxillary suture on the palate, the greater rugosity of 

 the facial sculpture, the smaller development of the preorbital 

 nodules, and the wider nasals. 



Hob. India and Burma. 



All the following specimens are from the Pliocene of the Siwalik 

 Hills, and, unless it is otherwise stated, belong to the Cautley 

 Collection. Presented, 1840. 



39795. The cranium of a half-grown individual. This specimen 

 {Fig.) is one of the types, and is described and figured in ' Fal- 

 coner's Pakeontological Memoirs,' vol. i. p. 355, pi. xxviii. 

 figs. 2, 3 (as C. bomhifrons), and by the present writer in 

 the ' Palaeontologia Indica,' ser. 10, vol. iii. p. 214, 

 pi. xxviii. figs. 1, 1 a. 



39796. The anterior portion of the cranium and mandible of a 



similar individual. Noticed by the writer, op. cit. p. 214. 



39797. The entire skull of a half-grown individual. Described and 

 {Fig.) figured by the writer, op. cit. p. 214, pi. xxviii. fig. 3 



(as No. 39798). Presented by Dr. Hugh Falconer. 



39798. The entire skull of a very similar individual. Figured in 

 {Fig.) 'Falconer's Palaeontological Memoirs,' vol. i. pi. xxviii. 



fig. 1 (as C. bomhifrons), and noticed by the writer op. cit. 

 p. 214 (as No. 39797). 



39799. The hinder half of a subadult skull, together with the 

 {Fig.) nuchal scutes and the humerus. 



39800. The anterior portion of the cranium of an adult individual, 

 {Fig.) with the alveolar region cut and polished. Described and 



figured by the writer, op. cit. p. 215, pi. xxix. figs. 2, 2 a. 



39801. The anterior portion of an adult cranium. Figured by 

 {Fig.) Cautley in the ' Asiatic Researches,' vol. xix. pi. ii. figs. 2, 



4 (as O. biporcatus 2 ), and noticed by the writer, op. cit. 

 p. 215 (as No. 39081). 



1 Palaeontologia Indica (Mem. Geol. Surv. Ind.), ser. 10, yoI. iii. p. 213 (1886). 



2 C. biporcatus of Cautley is C. palustris, and not C. porossu ; see ' Paleeon- 

 tologia Indica,' ser. 10, vol. iii. p. 213. 



