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406 GEOGRAPHICAL ZOOLOGY. [part IV.
Family 55.—CEOCODILID^. (1 Genus, 12 Species.)
Neotropical
Sob-regions.
Nearctic
Sub-regions.
General Distribution.
Pal^arctic
sub-kegions.
Ethiopian
Sub-regions.
Oriental
sub-kegions.
-2.3.4 1 .2.3.4 1 .2 .3 .4 1
Australian
Sub-regions.
The true Crocodiles, which have the canines in notches, and
the large front teeth in pits in the upper jaw, are widely
distributed over the tropical regions of the globe, inhabiting all
the rivers of Africa, the shores and estuaries of India, Siam,
and eastward to North Australia. Other forms inhabit Cuba,
Yucatan, and Guatemala, to Ecuador and the Orinooko. Four
species are Asiatic, one exclusively Australian, three African,
and four American. These have been placed in distinct
groups, but Dr. Giinther considers them all to form one
genus, Crocodilus.
Family 56.—ALLIGATORID^. (1 Genus, 10 Species.)
General Distribution.
Neotropical Nearctio Pal^arctic Ethiopian Oriental I
Australian'
Bub-regions. Sob-regions. Sob-regions. Sub-regions. Sub-regions. Sub-regions.
2 . 3
The Alligators, which are distinguished by having both the
large front teeth and the canines fitting into pits of the
upper jaw, are confined to the Neotropical, and the southern
part of the Nearctic regions, from the lower Mississippi and
Texas through all Tropical America, but they appear to be
absent from the Antilles. They are all placed by Dr. Giinther
in the single genus. Alligator.
General Bemarks on the Distribution of Crocodilia.
These animals, being few in number and wholly confined
to the tropical and sub-tropical regions, are of comparatively