CHAPTER XVIII.
THE DISTRIBUTION OF THE FAMILIES AND GENERA OF BIRDS.
Passeres (p. 255)--General Remarks on the Distribution of the Passeres (p. 299)--Picariæ (p. 302)--General Remarks on the Distribution of the Picariæ (p. 322)--Psittaci (p. 324)--General Remarks on the Distribution of the Psittaci (p. 329)--Columbæ (p. 331)--General Remarks on the Distribution of the Columbæ (p. 335)--Gallinæ (p. 337)--General Remarks on the Distribution of Gallinæ (p. 344)--Opisthocomi (p. 345)--Accipitres (p. 345)--General Remarks on the Distribution of the Accipitres (p. 351) --Grallæ (p. 351)--General Remarks on the Distribution of the Grallæ (p. 362)--Anseres (p. 363)--General Remarks on the Distribution of the Anseres (p. 367)--Struthiones (p. 368)--Struthious Birds recently Extinct (p. 369)--General Remarks on the Distribution of the Struthiones (p. 370) 255-371