BIRDS, 



499 



mark of the elliptic ornament {h fig. 59) having originally 

 been thicker than the upper mark (c). Every stej) can be 

 followed in the process of confluence and modifirntioi-i: and 

 the black ring which sur- 

 rounds the ball of the ocellus 

 is unquestionably formed by 

 the union and modification 

 of the three black marks, h, c, 

 d, of the elliptic ornament. 

 The irregular zigzag black 

 marks between the successive 



Fig. 60. 



ig. ei. 



Fig. 60. An ocellus in an intermedate condition between the elliptic ornament 

 and the perfect ball-and-socket ocellus. 



Fig. t>l. Portion near summit of one of the secondary wing-feathers, bearing 

 perfett ball-and-socket ocelli, a. Ornamented upper part. b. Uppermost, 

 imperfect ball-and-socket ocellus. (The shading above the white mark on 

 the summit of the ocellus is here a little too dark.) c. Perfect ocellus. 



ocelli (see again fig. 57) are plainly due to the breaking up 

 of the somewhat more regular but similar marks between 

 the elliptic ornaments. 



The successive steps in the shading of the ball-and- 

 socket ocelli can be followed out with equal clearness. 

 The brown, orange and pale-leadened narrow zones which 

 border the lower black mark of the elliptic ornament can 



