EXPLANATION OF PLATES. 
Prats 1. 
(FRONTISPIECE.) 
Tue NEEDLE-rAILED Swirt, Acanthyllis caudacuta. 
PLATE 2. 
(To face page 273.) 
Tur Prerecrine Fatcon, Falco peregrinus, showing the arrangement of 
feathers on the upper and under sides of the wing. 
Head of same. 
Closed wing of same. 
PLATE 3. 
(To face page 289.) 
Tue Gosuawk, Astur palumbarius, showing the arrangement of feathers 
on the upper and under sides of the wing. 
Closed wing of same. 
Foot of same. 
