LIST OF ILLUSTRATIONS xvii 



ILLUSTRATION PAGE 



37. Wing of a Long-kared Owl showing the Pointeo Type of 

 Wing Associated with Strong Powers of Flight - - - 376 



From The Transactions of the Linnean Society. 



38. Wing of a " Wood-Owl " showing the Rounded Type. (After 



Pycraft) - - 377 



By permission of the Editors of The Ibis. 



39. Shoulder-girdle and Sternum of an Eagle. (After Pycraft) - 379 



From The Proceedings 0/ the Zoological Society of London. 



40. Shoulder-girdle and Sternum of a Cormorant. (After Pycraft) 381 



From The Proceedings of the Zoological Society of London. 



41. Shoulder-girdle and Sternum of a Boatswain-bird. (After 



Pycraft) . . . , _ 382 



By permission of the Zoological Society of London. 



42. Types of Pelvic Girdles. (After Pycraft) 387 



From The Proceedings of the Zoological Society of London. 



43. Types of Birds' Feet. (After Pycraft) 395 



From The Book of Nature Study. 



44. Types of Syrinx 403 



45. Forms of the Beak in the Genus Geospiza .... 405 



From The Transactions of the Zoological Society of London. 



46. Upper Surface of the Wing of a Little Stint to show 

 the Overlap of the Coverts ; and Upper Surface of a Portion 

 OF the Wing of an Owl to show " Diastataxic " Condition. 

 (After Pycraft) 407 



From The Transactions of the Norfolk ami Norwich Naturalists' Society. 



47. Types of Beaks 413 



48. Ear Apertures of the Owls. (After D. Meinertzhagen) - - 416 



From The Transactions of the Linnean Society. 



49. Skulls of Owls, showing the Asymmetry of the Skull of 

 Tengmalm's Owl, and the Curious Differences in the Form 

 OF the Squamosal in the Young Tawny Owl and Young 

 Burrowing Owl. (After Pycraft) ------- 417 



From The Transactions of t lie Linnean Society. 



50. Types of Tongues. (After Lucas) 429 



