2. TOMI.STOMA. 3. CROCODILUS. 277 



posed of 22 transverse scries, the broadest of which conlain six 

 sculcs, the four anterior (nuchals) only two ; all keeled ; two small 

 postoccipital scutes. Fing-crs webbed at the base; outer toes exten- 

 sively webbed. A strong crest on the outer edge of the leg. Scales 

 on limbs keeled. Olive above, with dark spots or cross bands. 



lleaches a length of \h metres. 



Borneo. 



Dr. Bleaker. 

 Leyden Museum. 

 Leyden Museum. 

 Mr. Mitten [C.]. 



3. CROCODILUS. 



Crocodilus, part., Laur. Syn, Rept. p. 53 (1768); Strauch, Syn. 



Crocod. p. 28 (186G). 

 Crocodilus, Cuvier, Ann. Mus. x. p. 40 (1807) ; Wayl. Syst. Amph. 



p. 140 (1830) ; Dum. ^- Bihr. iii. p. 93 (1830) ; Gray, Cat. Tort. 



^•c. p. 58 (1844); Huxley, Juurn. Linn. Sac. iv. p. G (18(50); 



Giinth. Eept. Brit. hid. p. CO (18G4); Gray, Cat. Sh. liept. ii. 



p. 14 (1872). 

 Champse, Merrem, Tent. p. 3G (1820). 

 Mecistops, part.. Gray, Cat. Tort. p. 57. 

 Oopholis, Gray, I. c. p. 58, and Sh. Itcpt. p. 8. 

 Paliuia, Gray, II. cc. pp. GO, 13. 

 Molinia, Gray, II. cc. pp. GO, 17. 



Mecistops, liuxley, I.e. p. 15; Gray, Cat. Sh. Itept. p. 21. 

 Bombifrous, Gray, Ann. S)- May. N. 11. (3) x. p 209 (18G2), and 



Cat. Sh. Rept. p. 9. 

 Temsacus, Gray, II. cc. pp. 272, 18. 

 Philas, Gray, Proc. Zool. Sue. 1874, p. 177. 



17 to 19 upper and 15 lower teeth ou each side ; tifth maxillary 

 tooth largest ; the fourth mandibular usually fitting into a notch in 

 the upper jaw. Snout more or leas elongate ; nasal bones extending 

 to the nasal aperture, which is undivided and larger than the supra- 

 temporal fossa) ; a very small anterior bony plate in the upper eye- 

 lid. Spleuial bones not entering the mandibular symphysis, whicli 

 does not extend beyond the eighth tooth. A dorsal shield formed 

 of four or more longitudinal series of juxtaposed, keeled, bony 

 scutes. 



Africa, Southern Asia, North Australia, Tropical America. 



Notwithstanding all that has been written on the specific characters 

 of the Crocodiles, their distinction and definition remains a matter of 

 considerable difflciilty. Although the extreme forms, viz. C. caia- 

 phractus and C. jjalustris, differ very widely, the passage is so com- 

 plete as to render even subgencric divisions unadvisable. The 

 following key will, I hope, suffice in most cases for the exact 

 determination of the species, except with respect to newly born 

 specimens, which can only be named by comparison with older 

 examples. 



tt2 



