Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 28, 2025
The derivative origin of a species may sometimes be indicated by the extreme scarcity of the individuals, their colour, and worn condition; whereas an opposite conclusion may be arrived at by the integrity of the shells, especially when they are of delicate and tender structure, or their abundance, and, in the case of the lamellibranchiata, by their being held together by the ligament, which often happens when the shells have been so broken that little more than the hinges of the two valves are preserved.
There may, indeed, be said to be a continued decrease of the proportional number of this lower tribe of mollusca as we proceed from older to newer rocks. In the British Devonian, for example, the Brachiopoda number 99, the Lamellibranchiata 58; while in the Carboniferous their proportions are more than reversed, the Lamellibranchiata numbering 334 species, and the Brachiopoda only 157.
Lamarck, on the origin of man. Lamellibranchiata. Lamellicorn beetles, horn-like processes from the head and thorax of; influence of sexual selection on. Lamellicornia, stridulation of. Lamont, Mr., on the tusks of the walrus; on the use of its tusks by the walrus; on the bladder-nose seal. Lampornis porphyrurus, colours of the female. Lampyridae, distasteful to mammals. Lancelet.
Throughout this great division of the animal kingdom, as far as I can discover, secondary sexual characters, such as we are here considering, never occur. In the Lamellibranchiata, or bivalve shells, hermaphroditism is not rare. In the next higher class of the Gasteropoda, or univalve shells, the sexes are either united or separate.
Word Of The Day
Others Looking