Sex [electronic resource] . ticles. There can beno doubt that this also is used for holding thefemale, although the exact mode in which it isused has not been observed (Cunningham). The male salmon has the tip of the lowerjaw turned up and enlarged at the breedingseason. It forms a curious blunt hook-likeprocess, which is possibly of use when themales charge one another. In many cases,such as lumpsucker and stickleback, whichare as contrasted types as one can think of,the males are distinguished at the breedingseason by the brilliant colouring. In themale sea-horse (see Fig. 12) and some of it
Sex [electronic resource] . ticles. There can beno doubt that this also is used for holding thefemale, although the exact mode in which it isused has not been observed (Cunningham). The male salmon has the tip of the lowerjaw turned up and enlarged at the breedingseason. It forms a curious blunt hook-likeprocess, which is possibly of use when themales charge one another. In many cases,such as lumpsucker and stickleback, whichare as contrasted types as one can think of,the males are distinguished at the breedingseason by the brilliant colouring. In themale sea-horse (see Fig. 12) and some of itsrelatives, the most striking sex-distinction isthe possession of a pouch in which the eggsdevelop. It is noteworthy that in the genusSolenostoma, the pouch is in the female, whichis more vividly coloured and spotted than themale. Perhaps she has to attract her mate 1 There is among insects an embarrassing SEX-CHARACTERS ILLUSTRATED 65 wealth of instances of sex-dimorphism. Malebutterflies and moths are often more brilliant. Fig. 12.—The Sea-horse—Hippocampus. A male, showingthe brood-pouch (B) in which the eggs are carried, theprehensile tail (T), and the rapidly vibrating dorsalfin (DF). and decorative than the females, but thereverse is sometimes the case, and, morecommonly still, the sexes are similar. The E 66 SEX males have often more elaborate antennaeand other sense-organs, which are importantin finding the female. Among the Dynastidbeetles the males often have extraordinaryhorn-like projections from the head and
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