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Updated: June 17, 2025
We may infer, then, that the strata deposited next after the almost "azoic" strata, would contain the remains of invertebrata, allied to those found near the shores of Australia and South America.
I have already mentioned that in Europe several quadrupeds of living, as well as extinct, species were common to pre-glacial and post-glacial times. In like manner there is reason to suppose that in North America much of the ancient mammalian fauna, together with nearly all the invertebrata, lived through the ages of intense cold.
Along the centre of the side-board, arranged with suspicious neatness, as though seldom disturbed, stood a line of solemn books, Holden's Osteology, Quain's Anatomy, Kirkes' Physiology, and Huxley's Invertebrata, together with a disarticulated human skull.
He observed that the oldest fishes present many characters which recall the embryonic conditions of existing fishes; and that, not only among fishes, but in several groups of the invertebrata which have a long palaeontological history, the latest forms are more modified, more specialised, than the earlier.
Turning to the Invertebrata, Barrande asserts, a higher authority could not be named, that he is every day taught that, although palaeozoic animals can certainly be classed under existing groups, yet that at this ancient period the groups were not so distinctly separated from each other as they now are.
To prevent this inconvenience she employs the heat and moisture of the sun and atmosphere, the dissolving power of carbonic and other acids, the grinding teeth and gastric juices of quadrupeds, birds, reptiles, and fish, and the agency of many of the invertebrata.
Excepting the faint clink of the Tritonia arborescens, repeated only once every minute or two, and apparently produced by the mouth armed with two dense horny laminæ, I am not aware of any sounds produced in the sea by branchiated invertebrata.
So far, indeed, as the Invertebrata, and the lower Vertebrata are concerned, the facts and the conclusions which are to be drawn from them appear to me to remain what they were.
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