416 ZOOLOGICAL GEOGRAPHY. (PART III. 
—Morelia, Liasis, Diemenia, and Acanthophis ; while four others 
are more especially Papuan,—Dibamus (Typhlopide), Brachy- 
orros—a sub-genus of the wide-spread Rhabdosoma (Calamariide), 
found also in Timor ; Nardoa and Enygrus (Pythonidz), ranging 
from the Moluccas to the Fiji Islands. The rest are either com- 
mon to the Oriental and Australian regions or of wide range. 
Of Lizards also, 24 genera are recorded, belonging to 5 families. 
Three only are peculiarly Oriental,—Zwmeces, Tiaris, and Nycte- 
ridium ; but another, Gonyocephalus, is Malayan, ranging from 
Java and Borneo to the Pelew Islands. Three are Australian,— 
Cyclodus, Heteropus, and Gehyra ; while six are especially Papuan, 
—Kenevxia (extending to the Philippines), Hlania, Carlia (to 
North Australia), Zipinia (to the Philippine Islands), and Z7i- 
bolonotus,—all belonging to the Scincide ; and Arua belonging 
to the Agamide. We must add Cryptoblepharus, which is con- 
fined to the Australian region, except a species in Mauritius. 
The other genera have a wider distribution. 
The preponderant Oriental element in the snakes as compared 
with the lizards, is suggestive of the dispersal of the former being 
dependent on floating trees, or even on native canoes, which for 
an unknown period have traversed these seas, and in which 
various species of snakes often secrete themselves. This seems 
the more probable, as snakes are usually more restricted in their 
range than lizards, and exhibit less numerous examples of wide- 
spread genera and species. The other orders of reptiles present 
no features of interest. 
Of Amphibia only 8 genera are known, belonging to 6 families. 
Rana, Hylarana, and Hyla are wide-spread genera, the former 
being, however, absent from Australia. Hyperolius, Pelodryas, 
Litoria, and Asterophrys are Australian; while Platymantis is 
Polynesian, with a species in the Philippine Islands. Hence 
it appears that the amphibia, so far as yet known, exhibit 
no Oriental affinity; and this is a very suggestive fact. We 
have seen (p. 29) that salt water is almost a complete barrier 
to the dispersal of these creatures; so that the wholly Aus- 
tralian character of the Papuan batrachia is what we might 
expect, if, as here advocated, no actual land connection between 
