2. TOMISTOMA.—3. CROCODILUS. 277 
posed of 22 transverse series, the broadest of which contain six 
scutes, the four anterior (nuchals) only two ; all keeled ; two small 
postoccipital scutes. Fingers 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. 
Reaches a length of 43 metres. 
Borneo. 
a. Ye, spir. Borneo. Dr. Bleeker. 
b-c. Embryos, spir. Borneo. Leyden Museum. 
d. Ad., skull. Borneo. Leyden Museum. 
e. Ad., skull, Borneo. Mr. Mitten [C.]. 
3. CROCODILUS. 
Crocodilus, part., Lawr. Syn. Rept. p. 53 (1768); Strauch, Syn. 
Crocod, p. 28 (1866). 
Crocodilus, Cuvier, Ann. Mus. x. p. 40 (1807); Wagl. Syst. Amph. 
p- 140 (1880) ; Dum. § Bibr. iii. p. 93 (1836); Gray, Cat. Tort. 
&e, p. 58 (1844); Hualey, Journ. Linn. Soe. iv. p. 6 (1860) ; 
Giinth. Rept. Brit. Ind. p. 60 (1864); Gray, Cat. Sh. Rept. u. 
p. 14 (1872). 
Champse, Merrem, Tent. p. 56 (1820). 
Mecistops, part., Gray, Cat. Tort. p. 57. 
Oopholis, Gray, 1. c. p.58, and Sh. Rept. p. 8. 
Palinia, Gray, ll. cc. pp. 60, 13. 
Molinia, Gray, ll. ce. pp. 60, 17. 
Mecistops, Hualey, l.c. p. 15; Gray, Cat, Sh, Rept. p. 21. 
Bombifrons, Gray, Ann. § Mag. N. H. (3) x. p. 269 (1862), and 
Cat, Sh. Rept. p. 9. 
Temsacus, Gray, ll. cc. pp. 272, 18. 
Philas, Gray, Proc, Zool, Soc. 1874, p. 177. 
17 to 19 upper and 15 lower teeth on each side; fifth maxillary 
tooth largest ; the fourth mandibular usually fitting into a notch in 
the upper jaw. Snout more or less elongate ; nasal bones extending 
to the nasal aperture, which is undivided and larger than the supra- 
temporal fossee ; a very small anterior bony plate in the upper eye- 
lid. Splenial bones not entering the mandibular symphysis, which 
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 difficulty. Although the extreme forms, viz. C. cata- 
phractus and C. palustris, differ very widely, the passage is so com- 
plete as to render even subgeneric 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. 
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