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TABLE I.

Approximate Numbers of Families, Genera, and Species of
Mammals in the six Regions.

Regions.

1. Australian 2. Neotropical

3. Ethiopian

4. Oriental

5. Nearctic

6. Palæarctic

Regions.

1. Australian 2. Neotropical 3. Ethiopian.

4. Oriental

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5. Nearctic
6. Palearctic.

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Widespread.

23

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20

11

13

30 42

Families.

Total.

874200

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18

17

36

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32

Quasi- Wideendemic. spread.

Genera.

TABLE II.

Numbers given in Table I. reduced to Percentages of Total
Numbers of Families and Genera.

Quasiendemic.

28 103 15 12

50

46

71

91
90

100

633024

Widespread.

27 84

48

60

79

66

34
30

24

Total.

10 64 113

43 66
74 103

Endemic.

130

150

Genera.

Species.

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Total.

11

284
501

577

557

192

448

Quasi- Wideendemic. spread.

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The groups entirely confined to each region are classed as "endemic " those that cross the frontiers slightly as "quasi-endemic "; all others are considered as "wide-spread."

The percentages, it will be observed, on account of the omission of fractions, do not exactly make up one hundred in every case.

CASTE

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LIST OF THE PRINCIPAL AUTHORITIES REFERRED TO

IN CHAPTER I.

(1) ALLEN, J. A.-"The Geographical Distribution of Mammals." Bull. U.S. Geol. Surv. IV., p. 376 (1878).

(2) "The Geographical Distribution of North American Mammals." Bull. Amer. Mus. Nat. Hist. IV., p. 199 (1892).

(3) FLOWER, W. H., and LYDEKKER, R.-" An Introduction to the Study of Mammals, Living and Extinct." London (1891).

(4) GILL, T.-"The Principles of Zoo-Geography." Proc. Biol. Soc. Washington, II., p. 1 (1885).

(5) HEILPRIN, A.-"The Geographical and Geological Distribution of Animals." London (1887).

(6) HUXLEY, T. H.-"On the Classification and Distribution of the Alectoromorphæ and Heteromorpha." Proc. Zool. Soc., 1868, p. 294.

(7) NEWTON, A.-Article on Geographical Distribution in the "Dictionary of Birds," p. 311. London (1893).

(8) SALVADORI, T.-"Catalogue of the Psittaci or Parrots in the Collection of the British Museum." London (1891).

(9) SCLATER, P. L.-" On the General Geographical Distribution of the Members of the Class Aves." Journ. Proc. Linn. Soc. (Zool.), vol. ii., p. 130 (1858).

(10) Address to Section D. (Biology). "Report of the FortyFifth Meeting of the British Association at Bristol,” p. 85 (1876). (11) — "On the recent Advances in our Knowledge of the Geographical Distribution of Birds." Ibis (6), vol. iii., p. 514 (1891).

(12) SHARPE, R. B.-"On the Zoo-Geographical Areas of the World." Nat. Science III., p. 100 (1893).

(13) WALLACE, A. R.-"The Geographical Distribution of Animals." 2 vols. London (1876).

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