. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. as in the Oolitic period, and are in general much orna-mented, («.) The Acephala furnish us, also, with peculiartypes, not occurring elsewhere, Magas^ («,) the hioceramus^ * {a^ Ammonites; [h) Crioceras; (c) Scaphites; (d) Ancyloceras(c) Hamites; (/) Baculites; (y) Turnlites. AGES OF NATURE. 233 {!),) the Hipimritcs^ (c,) and peculiar Spnndi/li, with lo
. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. as in the Oolitic period, and are in general much orna-mented, («.) The Acephala furnish us, also, with peculiartypes, not occurring elsewhere, Magas^ («,) the hioceramus^ * {a^ Ammonites; [h) Crioceras; (c) Scaphites; (d) Ancyloceras(c) Hamites; (/) Baculites; (y) Turnlites. AGES OF NATURE. 233 {!),) the Hipimritcs^ (c,) and peculiar Spnndi/li, with longspines, (d.) There is also a great variety of GasJero-pcis, among which are some peculiar forms of Pleu. Fig. 166. rotomaria, {e.) The Radiates are not inferior to the othersin variety.* 489. Tertiary Age. Reign of Mammals. — The mostsignificant characteristic of the Tertiary faunas is theirgreat resemblance to those of the present epoch. The ani-mals belong in general to the same families, and mostlyto the same genera, differing only as to the species. Andthe specific differences are sometimes so slightly marked,that a considerable familiarity with the subject is required,in order readily to detect them. Many of the most abundanttypes of former epochs have now disappeared. The changesare especially striking among the ]\Iollusks, the two greatfamilies of Ammonites and Belemnites, which present suchan astonishing variety in the Oolitic and Cretaceous epochs,being now completely wanting. Changes of no less impor-tance take place among the Fishes, which are for the mostpart covered with horny scales, like those of the presentepoch, while in earlier ages they were generally coveredwith ena
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectp, booksubjectzoology
