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forms and their habitats, are entirely unnoticed, owing to the productions of the same locality never being associated in our museums and collections. A few such relations have been brought to light by modern scientific travellers, but many more remain to be discovered; and there is probably no fresher and more productive field still unexplored in Natural History. Most of these curious and suggestive relations are to be found in the productions of islands, as compared with each other, or with the continents of which they form appendages; but these can never be properly studied, or even discovered, unless they are visibly grouped together. When the birds, the more conspicuous families of insects, and the land-shells of islands, are kept together so as to be readily compared with similar associations from the adjacent continents or other islands, it is believed that in almost every case there will be found to be peculiarities of form or colour running through widely different groups, and strictly indicative of local or geographical influences. Some of these coincident variations have been alluded to in various parts of this work, but they have never been systematically investigated. They constitute an unworked mine of wealth for the enterprising explorer; and they may not improbably lead to the discovery of some of the hidden laws (supplementary to Natural Selection), which seem to be required, in order to account for many of the external characteristics of animals.

In concluding his task, the author ventures to suggest, that naturalists who are disposed to turn aside from the beaten track of research, may find in the line of study here suggested a new and interesting pursuit, not inferior in attractions to the lofty heights of transcendental anatomy, or the bewildering mazes of modern classification. And it is a study which will surely lead them to an increased appreciation of the beauty and the barmony of nature, and to a fuller comprehension of the complex relations and mutual interdependence, which link together every animal and vegetable form, with the ever-changing earth which supports them, into one grand organic whole.



All names in Italics refer, either to the genera and other groups of Extinct
Animals in Part II. of the First Volume ;-or to the genera whose distribution
is given under Geographical Zoology (Part IV.) in the Second Volume; the
Families and higher groups being in small capitals. All other references are in
ordinary type.

The various matters discussed under Zoological Geography (Part 111.), are
indexed as much as possible by subjects and localities. 'None of the genera
mentioned in this Part are indexed, as this would have more than doubled the
extent of the Index, and would have servedno useful purpose, because the
general distribution of each genus is given in Part IV., and the separate details
can always be found by referring to the region, sub-region, and class.



Aard-vark of East Africa, figure of, i. 261
Aard-vark. ii. 246
Aard-wolf, ii. 196
Abacetus, ii. 491
Abar, ii. 489
Abisara, ii. 475
Ablabes, ii. 375
Ablepharus, ii. 395
Abramis, ii. 453
Abronia, ii. 392
Abrornis, ii. 258
Abrostomus, ii. 451
Aburriu, ií. 343
Acalyptus, ii 384
Acanthias, ji. 461
Acanthicus, ii. 444
Acanthion, ii. 240
Acanthis, ii. 283
Acanthisilta. ii. 265
Aanthiza, ii. 258
Acanthobrama, ii. 453
Acanthodactylus, ii. 391
Acanthodelphis, ii. 209
Acantholabrus, ii. 437
Acanthomys, ii, 229
Acanthophis, ii, 383
Acanthopsis, ii. 453

GNATHI, ii, 437
Acanthopthalmus, ii. 453
Acanthoplila, il. 201
Acanthorpyga, ii 390
Acanthorhynchus, ii. 275
Acanthosaura, ii. 402

Acara, ii. 438
Accentor, ii. 260
Accentorinæ, ii. 257
Accipenser, ii. 459
Accipiter, ii. 348
Accipitres, European Eocene, i. 163
Accipitres, classification of, i. 97

range of Palearctic genera of, i. 248
range of Ethiopian genera of, i. 312
range of Oriental genera of, i. 385

range of Australian genera of, i. 486

general remarks on the distribution of, ii.
Acerina, ii. 425
Aceros, ii. 317
Acerotherium, ii. 214
Acerotherium, European Miocene, i. 119

N. American Tertiary, i. 136
Acestra, ii. 444
Acestura, ii. 108
Achalinus, ii. 375
Acharnes, ii. 434
Achatina, ii. 515
Achatinella, ii. 514
Acherontia, ii. 483
Achilognathus, ii. 452
Achonodon, N. American Tertiary, i. 138
Acicula, ii. 519
ACICULIDÆ, ii. 519
Acmaeodera, ii. 497
Acodon, ii. 230
ACONTIADÆ, ii. 399
Acontias, ii. 399
Acotherium, European Eocene, i. 126
Acotherium, ii. 215

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