Cynocephalus hamadryas, sexual difference of colour in.
Cynocephalus leucophaeus, colours of the sexes of.
Cynocephalus mormon, colours of the male.
Cynocephalus porcarius, mane of the male.
Cynocephalus sphinx.
Cynopithecus niger, ear of.
Cypridina, proportions of the sexes in.
Cyprinidae, proportion of the sexes in the.
Cyprinidae, Indian.
Cyprinodontidae, sexual differences in the.
Cyprinus auratus.
Cypris, relation of the sexes in.
Cyrtodactylus rubidus.
Cystophora cristata, hood of.
Dacelo, sexual difference of colour in.
Dacelo Gaudichaudi, young male of.
Dal-ripa, a kind of ptarmigan.
Damalis albifrons, peculiar markings of.
Damalis pygarga, peculiar markings of.
Dampness of climate, supposed influence of, on the colour of the skin.
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