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Updated: April 30, 2025
Lyell, namely, that the "longevity of the species in the mammalia is upon the whole inferior to that of the testacea." The great size of the bones of the Megatheroid animals, including the Megatherium, Megalonyx, Scelidotherium, and Mylodon, is truly wonderful.
Lepidoptera, numerical proportions of the sexes in the; colouring of; ocellated spots of. Lepidosiren. Leptalides, mimicry of. Leptorhynchus angustatus, pugnacity of male. Leptura testacea, difference of colour in the sexes. Leroy, on the wariness of young foxes in hunting-districts; on the desertion of their young by swallows. Leslie, D., marriage customs of Kaffirs. Lesse, valley of the.
The museum comprehended an infinite number of medals, coins, urns, utensils, seals, cameos, intaglios, precious stones, vessels of agate and jasper, crystals, spars, fossils, metals, minerals, ore, earths, sands, salts, bitumens, sulphurs, ambergrise, talcs, mirre, testacea, corals, sponges, echini, echenites, asteri, trochi, crustatia, stellae marine, fishes, birds, eggs and nests, vipers, serpents, quadrupeds, insects, human calculi, anatomical preparations, seeds, gums, roots, dried plants, pictures, drawings, and mathematical instruments.
In the basin of the Clyde we have already seen that Recent strata occur 25 feet above the sea-level, with existing species of marine testacea, and with buried canoes, and other works of art. At the higher level of 50 feet occurs the well-known raised beach of the western coast, which, according to Mr.
In that region, about 200 species of testacea, marine and fresh-water, have been obtained, with many foraminifera and remains of fish.
In both, as in the Bathymetrical regions of the South Atlantic, the Testacea of the depths are generally smaller and less brightly coloured than those inhabiting the shallows. During this voyage notes of the habitats of considerably more than a thousand species of Mollusca and Echinodermata were carefully registered. The following Catalogue is founded on the monograph of Helicidae by Dr. Pfeiffer.
In the same work I have shown that near Stockholm, in Sweden, there occur, at slight elevations above the sea-level, horizontal beds of sand, loam, and marl, containing the same peculiar assemblage of testacea which now live in the brackish waters of the Baltic.
In several places, as at Woolwich on the Thames, at Newhaven in Sussex, and elsewhere, a mixture of marine and fresh-water testacea distinguishes this member of the series. They clearly indicate points where rivers entered the Eocene sea.
Thus, for example, the testacea, zoophytes, and fish of the Red Sea are, as a group, extremely distinct from those inhabiting the adjoining parts of the Mediterranean, although the two seas are separated only by the narrow isthmus of Suez.
The utility of the testacea is, moreover, enhanced by the circumstance that some forms are proper to the sea, others to the land, and others to fresh water. Rivers scarcely ever fail to carry down into their deltas some land-shells, together with species which are at once fluviatile and lacustrine.
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