Archive image from page 440 of The descent of man . The descent of man : and selection in relation to sex descentofmanseledarw Year: 1874 Fig-. 55. Part of a tail-covert of Polyplectron chinquis, with the two ocelli of nat. size. Fig-. 56. Part of a tail-covert of Polyplectron malac- cense, with the two ocelli, partially confluent, of nat, size. their ocelli showed any tendency to disappear; and to my great satisfaction, this appeared to be so. The central taii-feathers of P. napoleonis have the two ocelli on each side of the shaft per- fectly developed; but the inner ocellus becomes less and
Archive image from page 440 of The descent of man . The descent of man : and selection in relation to sex descentofmanseledarw Year: 1874 Fig-. 55. Part of a tail-covert of Polyplectron chinquis, with the two ocelli of nat. size. Fig-. 56. Part of a tail-covert of Polyplectron malac- cense, with the two ocelli, partially confluent, of nat, size. their ocelli showed any tendency to disappear; and to my great satisfaction, this appeared to be so. The central taii-feathers of P. napoleonis have the two ocelli on each side of the shaft per- fectly developed; but the inner ocellus becomes less and less conspicuous on the more exterior tail-feathers, until a mere shadow or rudiment is left on the inner side of the outermost feather. Again, in P. malaccense, the ocelli on the tail-coverts are, as we have seen, confluent; and these feathers are of un- usual length, being two-thirds of the length of the tail-feathers. so that in both these respects they approach the tail-coverts of the peacock. Now in P. malaccense the two central tail-feathers alcne are ornamented, each with two brightly-colored ocelli, the inner ocellus having completely disappeared from all the other tail-feathers. Consequently the tail-coverts and tail-feathers of this species of Polyplectron make a near approach in structure and ornamentation to the corresponding feathers of the peacock.
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