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| | Robert Chambers, "Vestiges of the Natural History of Creation," Ch. 5, 1844 |
 | | Even throughout the sub-groups of the system itself, the species are changed; and these are phenomena observed throughout all the subsequent systems or geological eras; apparently arguing that, during the deposition of all the rocks, a gradual change of physical conditions was constantly going on. |
 | | Some of the fossils of this system,the cephalaspis, coccosteus, pterichthys, holoptychiusare, in form and structure, entirely different from any fishes now existing, only the sturgeon family having any trace of affinity to them in any respect. |
 | | It appears that in the imperfect condition of the vertebral column, and the inferior situation of the mouth in the pterichthys, coccosteus, &c, there is an analogy to the form of the dorsal cord and position of the mouth in the embryo of perfect fishes. |
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