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Males and females, comparative numbers of; comparative mortality of, while young. Malherbe, on the woodpeckers. Mallotus Peronii. Mallotus villosus. Malthus, T., on the rate of increase of population. Maluridae, nidification of the. Malurus, young of. Mammae, rudimentary, in male mammals; supernumerary, in women; of male human subject. Mammalia, Prof. Owen's classification of; genealogy of the.
Modifications, unserviceable. Moggridge, J.T., on habits of spiders; on habits of ants. Moles, numerical proportion of the sexes in; battles of male. Mollienesia petenensis, sexual difference in. Mollusca, beautiful colours and shapes of; absence of secondary sexual characters in the. Molluscoida. Monacanthus scopas and M. Peronii. Monboddo, Lord, on music.
In another species, M. peronii, the male has a brush like that possessed by the female of the last species, whilst the sides of the tail in the female are smooth. In some other species of the same genus the tail can be perceived to be a little roughened in the male and perfectly smooth in the female; and lastly in others, both sexes have smooth sides.
Now in three species of Lepas, in Dichelaspis Warwickii and in Scalpellum Peronii, Darwin saw, on tearing recently-affixed animals from their point or support, that a long narrow band issued from the same point of the antennae; its end was torn away, and in Dichelaspis, judging from its ragged appearance, it had attached itself firmly to the support.
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