CHAP. IV.] 
ZOOLOGICAL regions. 
81 
arisen ; and it is hoped that these divisions will prove as satis- 
factory and useful to naturalists in general as they have been to 
the author. Of course, in a detailed study of any region much 
more minute sub-division may be required; but even in that 
case it is believed that the sub-regions here adopted, will be 
found, with slight modifications, permanently available for ex- 
hibiting general results. 
I give here a table showing the proportionate richness and 
speciality of each region as determined by its families of verte- 
brates and genera of mammalia and birds ; and also a general 
table of the regions and sub-regions, arranged in the order that 
seems best to show their mutual relations. 
Comparative Richness ©f the Six Regions. 
Vertebrata. 
Mammalia. 
Birds. 
Regions. 
Fami- 
Peculiar 
Peculiar 
Per 
frPTlPrfl 
Peculiar 
Per 
lies. 
families 
Genera. 
genera. 
ceutage. 
genera. 
ceutage. 
Palrearctic. . . 
136 
3 
100 
35 
35 
174 
57 
33 
Ethiopian ... 
174 
22 
140 
90 
64 
294 
179 
60 
Oriental 
164 
12 
L18 
55 
46 
340 
165 
48 
Australian... 
141 
30 
72 
44 
61 
298 
189 
64 
Neotropical.. 
168 
44 
130 
103 
79 
683 
576 
86 
Nearctic 
122 
12 
74 
24 
32 
169 
52 
.31 
Table of Regions and Sub-regions. 
Regions, 
Sub-regions. 
Remarks. 
I. Palcearctic. . . 
1. North Europe. 
2. Mediterranean (or S. Eu.) 
Transition to Ethiopian. 
3. Siberia. 
Transition to Nearctic. 
4, Manchuria (or J apan) 
Transition to Oriental. 
II. Ethiopian ... 
1. East Africa. 
2. West Africa. 
3. South Africa. 
4. Madagascar. 
Transition to Palsearctic. 
