Archive image from page 512 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansele1874darw Year: 1874 BIRDS. 499 mark of the elliptic ornament {h fig. 59) having originally been thicker than the upper mark {c). Every step can be followed in the process of confluence and modification; and the black ring which sur- rounds the ball of the ocellus is unquestionably formed by the union and modification of tlie three black marks, b, c, dy of the elliptic ornament. The irregular zigzag black xnarks between the successive

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