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Updated: May 13, 2025
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.
Thus, as Fritz Muller has lately remarked, in the same group of crustaceans, Cypridina is furnished with a heart, while in two closely allied genera, namely Cypris and Cytherea, there is no such organ; one species of Cypridina has well-developed branchiae, while another species is destitute of them.
On the other hand, Muller has invariably taken far more males than females of the Diastylidae and of Cypridina on the shores of Brazil: thus with a species in the latter genus, 63 specimens caught the same day included 57 males; but he suggests that this preponderance may be due to some unknown difference in the habits of the two sexes.
Milne-Edwards did this when he separated Mysis and Leucifer from the Decapoda, but he himself afterwards saw that this was an error. In one Cypridina I find branchiae of considerable size, which are entirely wanting in another species, but this does not appear to me to be a reason for separating these species even generically.
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