The geographical distribution of animals, with a study of the relations ...
The geographical distribution of animals, with a study of the relations ... The geographical distribution of animals, with a study of the relations ...
82 DISTRIBUTION OF ANIMALS. [part. I.Table of Regions and Sub-regions— continued.Regions.
—CHAPTER V.CLASSIFICATION AS AFFECTING THE STUDY OF GEOGRAPHICALDISTRIBUTION.A little consideration will convince us, that no inquiry intothe causes and laws which determine the geographical distributionof animals or plants can lead to satisfactory results, unlesswe have a tolerably accurate knowledge of the affinities of theseveral species, genera, and families to each other; in otherwords, we require a natural classification to work upon.for example, take three animalsLet us,a, b, and c—which have ageneral external resemblance to each other, and are usuallyconsidered to be really allied ; and let us suppose that a and binhabit the same or adjacent districts, while c is found far awayon the other side of the globe, with no animals at all resemblingit in any of the intervening countries.We should here have adifficult problem to solve ; for we should have to show that thegeneral laws by which we account for the main features ofdistribution, will explain this exceptional case. But now, supposesome comparative anatomist takes these animals in hand,and finds that the resemblance of c to a and b isonly superficial,while their internal structure exhibits marked and importantdifferences ; and that c really belongs to another group ofanimals, d, which inhabits the very region in which c wasfound— and we should no longer have anything to explain.This is no imaginary case. Up to a very few years ago acurious Mexican animal, Bassaris astuta, was almost alwaysclassed in the civet family (Viverrida3), a group entirely con-
- Page 64 and 65: 32 DISPERSAL AND MIGRATION. [part i
- Page 66 and 67: 34 DISTRIBUTION OF ANIMALS. [part i
- Page 68 and 69: 36 DISTRIBUTION OF ANIMALS. [part r
- Page 70 and 71: 38 DISTRIBUTION OF ANIMALS. [part i
- Page 72 and 73: 40 DISTRIBUTION OF ANIMALS. [part i
- Page 74 and 75: 42 DISTRIBUTION OF ANIMALS. [part i
- Page 76 and 77: 44 DISTRIBUTION OF ANIMALS. [part i
- Page 78 and 79: —46 DISTRIBUTION OF ANIMALS. [par
- Page 80 and 81: ;48 DISTRIBUTION OF ANIMALS. [part
- Page 82 and 83: CHAPTER IV.ON ZOOLOGICAL REGIONS.To
- Page 84 and 85: ;52 DISTRIBUTION OF ANIMALS. [part
- Page 86 and 87: 54 DISTRIBUTION OF ANIMALS. [part i
- Page 88 and 89: 56 DISTRIBUTION OF ANIMALS. [part i
- Page 90 and 91: 58 DISTRIBUTION OF ANIMALS. [part i
- Page 92 and 93: ;GO DISTRIBUTION OF ANIMALS. [part
- Page 94 and 95: ;G2 DISTRIBUTION OF ANIMALS. [part
- Page 96 and 97: G4 DISTRIBUTION OF ANIMALS. [part i
- Page 98 and 99: ;GG DISTRIBUTION OF ANIMALS. [part
- Page 100 and 101: ;68 DISTRIBUTION OF ANIMALS. [part
- Page 102 and 103: 70 DISTRIBUTION OF ANIMALS. [part r
- Page 104 and 105: 72 DISTRIBUTION OF ANIMALS. [part I
- Page 106 and 107: 74 DISTRIBUTION OF ANIMALS. [part i
- Page 108 and 109: 76 DISTRIBUTION OF ANIMALS. [part i
- Page 110 and 111: 78 DISTRIBUTION OF ANIMALS. [part i
- Page 112 and 113: ;80 DISTRIBUTION OF ANIMALS. [part
- Page 116 and 117: 84 DISTRIBUTION OF ANIMALS. [part i
- Page 118 and 119: 86 DISTRIBUTION OF ANIMALS. [part I
- Page 120 and 121: 131..88 DISTRIBUTION OF ANIMALS. [p
- Page 122 and 123: ,62.:90 DISTRIBUTION OF ANIMALS. [p
- Page 124 and 125: .92 DISTRIBUTION OF ANIMALS. [part
- Page 126 and 127: —94 DISTRIBUTION OF ANIMALS. [par
- Page 128 and 129: :,Numidinae..:96 DISTRIBUTION OF AN
- Page 130 and 131: —98 DISTRIBUTION OF ANIMALS. [PAR
- Page 132 and 133: ———100 DISTRIBUTION OF ANIMAL
- Page 134 and 135: 102 DISTRIBUTION OF ANIMALS. [part
- Page 136 and 137: ——104 DISTRIBUTION OF ANIMALS.
- Page 139 and 140: CHAPTER VI.THE EXTINCT MAMMALIA OF
- Page 141 and 142: ;chap, vi.] MAMMALIA OF THE OLD WOR
- Page 143 and 144: chap, vi.] MAMMALIA OF THE OLD WORL
- Page 145 and 146: ;chat, vi.] MAMMALIA OF THE OLD WOR
- Page 147 and 148: chap, vi.] MAMMALIA OF THE OLD WORL
- Page 149 and 150: ——chap, vi.] MAMMALIA OF THE OL
- Page 151 and 152: ;chap, vi.] MAMMALIA OF THE OLD WOR
- Page 153 and 154: chap, vi.] MAMMALIA OF THE OLD WORL
- Page 155 and 156: chap, vi.] MAMMALIA OF THE OLD WORL
- Page 157 and 158: chap, vi.] MAMMALIA OF THE OLD WORL
- Page 159 and 160: ;chap, vi.] MAMMALIA OF THE OLD WOR
- Page 161 and 162: CHAPTEE VII.EXTINCT MAMMALIA OF THE
- Page 163 and 164: chap. VII.] MAMMALIA OF THE NEW WOR
82 DISTRIBUTION OF ANIMALS. [part. I.Table <strong>of</strong> Regions and Sub-regions— continued.Regions.