The medals of creation, or, First lessons in geology, and in the study of organic remains Volume 1 - Tapa blanda
Sinopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1844 Excerpt: ...10, 11.).--These animalcules are free, and their cases bivalve, and of a cylindrical, globular, or discoidal form; they occur in chains, in consequence of their self-division being imperfect, and the new individuals remaining attached to the old. The Gaillonellc e are among the most abundant and prolific of animal organisms, and are to be found in every pool, stream, and lake: fossil species occur abundantly in the Virginian marl and other strata. Stnhedra (Plate IV. fig. 12.).--The shield is siliceous, and of a slender, elongated form. The animal is attached by the base (fig. 12a.) in youth, and afterwards becomes free. It is found fossil in the Mountain-meal of Santa Fiora, &c. Podosphenia (Plate IV. fig. 13.).--The carapace is cruciform, or wedge-shaped, and is attached in youth by the small end, but afterwards becomes free. These animalcules are often found arranged in clusters, as in the figure. M. Ehrenberg states that they inhabit the sea, and not fresh-water; but Mr. Lee has discovered specimens in streams communicating with the Thames, so closely resembling the figures of M. Ehrenberg, both in the individual forms, and in the mode of grouping, as evidently to belong to the same genus, if not species. The Podospfienia occurs fossil in the polishing slate of Bilin. Eunotia (Plate IV. figs. 16, 17.).--The carapace is siliceous, and either simple or bivalve; flat below, and convex, and often richly dentated above. An empty-earapace is shown fig. 16; and a group of living Eunotice attached to a stem of conferva fig. 17. Several fossil species have been discovered at Santa Fiora. That the general reader, whose attention is for the first time directed to these inquiries, may be in some measure prepared for the vast accumulation of fossil animalcules w...
"Sinopsis" puede pertenecer a otra edición de este libro.
Reseña del editor
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1844 Excerpt: ...10, 11.).--These animalcules are free, and their cases bivalve, and of a cylindrical, globular, or discoidal form; they occur in chains, in consequence of their self-division being imperfect, and the new individuals remaining attached to the old. The Gaillonellc e are among the most abundant and prolific of animal organisms, and are to be found in every pool, stream, and lake: fossil species occur abundantly in the Virginian marl and other strata. Stnhedra (Plate IV. fig. 12.).--The shield is siliceous, and of a slender, elongated form. The animal is attached by the base (fig. 12a.) in youth, and afterwards becomes free. It is found fossil in the Mountain-meal of Santa Fiora, &c. Podosphenia (Plate IV. fig. 13.).--The carapace is cruciform, or wedge-shaped, and is attached in youth by the small end, but afterwards becomes free. These animalcules are often found arranged in clusters, as in the figure. M. Ehrenberg states that they inhabit the sea, and not fresh-water; but Mr. Lee has discovered specimens in streams communicating with the Thames, so closely resembling the figures of M. Ehrenberg, both in the individual forms, and in the mode of grouping, as evidently to belong to the same genus, if not species. The Podospfienia occurs fossil in the polishing slate of Bilin. Eunotia (Plate IV. figs. 16, 17.).--The carapace is siliceous, and either simple or bivalve; flat below, and convex, and often richly dentated above. An empty-earapace is shown fig. 16; and a group of living Eunotice attached to a stem of conferva fig. 17. Several fossil species have been discovered at Santa Fiora. That the general reader, whose attention is for the first time directed to these inquiries, may be in some measure prepared for the vast accumulation of fossil animalcules w...
"Sobre este título" puede pertenecer a otra edición de este libro.
