File:Sex (electronic resource) (1914) (14590635280).jpg

Identifier: b20442221 (find matches)
Title: Sex (electronic resource)
Year: 1914 (1910s)
Authors: Geddes, Patrick, Sir, 1854-1932.
Subjects: Sex
Publisher: New York : H. Holt and company London : Williams and Norgate
Contributing Library: Wellcome Library
Digitizing Sponsor: Wellcome Library

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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
Text Appearing After Image:
Fig. 13.—The Hercules Beetle—Dynastes. In the male (M)a horn on the back of the head works against a still largerhorn arising from the top of the prothorax. The female(F) is smaller and without the horns. prothorax (see Fig. 13). They are out-growths of the chitinous cuticle and cannotbe moved of themselves, though they maybe brought together like the limbs of tongswhen the head and the prothorax are moved.Their use is uncertain. In the stag-beetles SEX-CHARACTERS ILLUSTRATED 67 (Lucanidse) the mandibles of the males aresometimes as long as the body, and, like theantlers of stags, they often seem to be verymuch in the way. Darwin called particularattention to the great differences in the degreeof development of the male excrescences inbeetles, some species having them in extra-ordinary exuberance while others show nodimorphism to speak of. In some cases, asin many moths, the female beetles are sluggishand have no wings. In the glow-worm (Lam-pyris noctiluca) the males have well-de

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