14S 
SEXUAL SELECTION: BIRDS. 
lit* 
n # 
the other parts (see fig. 56), and this follows fro® ^ 
lower black mark of the elliptic ornament (b) 1')' 
been originally thicker than the upper mark (c). ^ 
step can be followed in the process of confluence 
modification ; and the black ring which surrounds th £! . f 
of the ocellus is unquestionably formed by the 
and modification of the three black marks, l, c, d , c> * ,h 
elliptic ornament. The irregular zigzag blacl 
between the successive ocelli (see again fig. 56) 
plainly due to the breaking up of the somewhat 1 
regular but similar marks between the elliptic 
inents. 
✓ 
,4- 
The successive steps in the shading of the ba^' : ' . ;i 
socket ocelli can be followed out with equal cle 0,1 ^^ 
The brown, orange, and pale-leaden narrow zones " ^ 
border the lower black mark of the elliptic on®” | 
can be seen gradually to become more and more son ( 
and shaded into each other, with the upper lights 1 * 
towards the left-hand comer rendered still light®' 
■4* 
But even in the most 
to become almost white. 
ball-and-socket ocelli a slight difference in the 1 p 
though notin the shading, between the upper and 
parts of the hall can be perceived (as was before ' ,,,, 
ciallv noticed), the line of separation being «5 
’ ■’ " - ’sin.; 
ill”; 
in the saino direction with the bright coloured 
of the elliptic ornaments. Thus almost every 11,1 
detail in the shape and colouring of the ball-aod"' 1 jp 
ocelli can be shewn to follow from gradual cha' 1 ?, j)j0 
the elliptic ornaments ; and the development 0 ,;■/ 
latter can. he traced by equally small steps ft -0 ”' ji) 
p (fib' 
aide* 
union of two almost simple spots, the lower one 
having some dull fulvous shading on the upper r 
ml - X *x* _ -I* , 1 .. 
’ * => - ouuuu, 6 Uii W.t, MV 
The extremities of the longer secondary te 
which bear the perfect ball-and-socket ocelli a[ e ^ 
liarlv ornamented. (Fig. 59.) The oblique longi tu 
