Synopsis
Excerpt from The Descent of Man, and Selection in Relation to Sex
The males alone of the capelin (mallotus villosus, one of Salmonidae) are provided with a ridge of closely set, brush-like scales, by the aid of which two males, one on each side, hold the female, while she runs with great swiftness on the sandy beach, and there deposits her spawn. The Widely distinct Monacanthus scopas presents a somewhat analogous structure. The male, as Dr. Gunther informs me, has a cluster of stiff, straight spines, like those of a comb, on the sides of the tail; and these in a specimen six inches long were nearly one and a half inch in length; the female has in the same place a cluster of bristles, which may be compared with those of a toothbrush. In another Species, M. Permit, the male has a brush like that possessed by the female of the last species, While 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.
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