408 
GEOGRAPHICAL ZOOLOGY. 
[PART IV. 
Neotropical and Oriental regions ; in the Ethiopian there is a 
considerable diminution in the number of species, and in the 
Palaearctic they are still less numerous, being confined to the 
warmer parts of it, except one species which extends as far north 
as Hungary and Prussia. The genera are : — 
Testudo (25 sp.), most abundant in the Ethiopian region, 
but also extending over the Oriental region, into South 
Europe, and the Eastern States of North America; Emys 
(64 sp.), abundant in North America and over the whole 
Oriental region, less so in the Neotropical and the Palsearctic 
regions ; Cinosternon (13 sp.), United States and California, 
and Tropical America; Aromochelys (4 sp.), confined to the 
Eastern States of North America ; Staurotypus (2 sp.), Guate- 
mala and Mexico; Chelydra (1 sp.), Canada to Louisiana; 
Claudius (1 sp.), Mexico ; Dermatemys (3 sp.), South America, 
Guatemala, and Yucatan ; Terrapene (4 sp.), Maine to Mexico, 
Sumatra to New Guinea, Shanghae and Formosa — a doubtfully 
natural group ; Cinyxis (3 sp.), Pyxis (1 sp.), Chersina (4 sp.), 
are all Ethiopian ; Dumerilia (1 sp.), is from Madagascar only. 
Family 58. — CHELYDIDAE. (10 Genera, 44 Species.) 
General Distribution. 
Neotropical 
SuB-REG T ONR. 
Neargtic 
Sub-regions. 
Pal^; arctic 
Sub-regions. 
Ethiopian 
Sub-regions. 
Oriental 
Sub-regions. 
Australian 
Sub-regions. 
_ 2 
1.2 .3 . 4 
— 
_ 2 
The Chelydidse, or fresh-water tortoises with imperfectly 
retractile heads, have a remarkable distribution in the three 
great southern continents of Africa, Australia, and South 
America; the largest number of species being found in the latter 
country. The genera are : — 
Peltoccphalus (1 sp.), Podocnemis (6 sp.). Hydromedusa (4 sp.), 
Chelys (1 sp.), and Platemys (16 sp.), inhabiting South America 
from the Orinooko to the La Plata, the latter genus occurring 
also in Australia and New Guinea ; Chelodina (5 sp.), Chelcmys 
(1 sp.), and Elseya (2 sp.) from Australia ; while Sternotheres 
