Image from page 130 of “The old red sandstone; or, New walks in an old field. To which is appended a series of geological papers, read before the Royal physical society of Edinburgh” (1858)
Image from page 130 of “The old red sandstone; or, New walks in an old field. To which is appended a series of geological papers, read before the Royal physical society of Edinburgh” (1858) by Internet Archive Book Images
Title: The old red sandstone; or, New walks in an old field. To which is appended a series of geological papers, read before the Royal physical society of Edinburgh
Year: 1858 (1850s)
Authors: Miller, Hugh, 1802-1856
Subjects: Geology, Stratigraphic Geology
Publisher: Boston, Gould and Lincoln New York, Sheldon and company [etc., etc.]
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
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Text Appearing Before Image:
but of not more thanone sixth the size of those which cover the creatures sidesand back. Imagine two lug-sails stiffly extended betweenthe deck of a brigantine and her two masts, the latterraking as far aft as to form an angle of sixty degrees withthe horizon, and some idea may be formed of the dorsalsof this singular fish. They were lug-sails, formed not to beacted upon by the air, but to act upon the water. None ofmy specimens show the head ; but, judging from analogiesfurnished by the other families of the group, I entertain littledoubt that it will be found to be covered, not by bony plates,but by minute scales, diminishing, as they approach the snout,into mere points. In none of the specimens does any partof the internal skeleton survive. My collection contains the remains of yet another fish ofthis group, which was unfurnished with a name only a fewmonths ago, but which I first discovered about five yearssince. (See Plate VIII., fig. 2.) It is now designated the 84* PLATE VIII.
Text Appearing After Image:
THE OLD RED SANDSTONE. 85 Dijdacanthus ; and, though the smallest ichthyolite of the for-mation yet known, it is by no means the least curious. Thelength from head to tail, in some of my specimens, docs notexceed three inches; the largest fall a little short of five.The scales, which are of such extreme minuteness that theirpeculiarities can be detected by only a powerful glass, re-semble those of the Cheiracanlhus; but the ridges are morewaved, and seem, instead of running in nearly parallel lines,to converge towards the apex. There are two dorsals, theone rising immediately from the shoulder, a little below thenape, the other directly opposite the anal fin. The vcntralsare placed near the middle of the belly. There is a curiousmechanism of shoulder-bone involved with a lateral spine andwith the pectorals. The creature, unlike the C heir acanthus.seems to have been furnished with jaws of bone : there arefragments of bone upon the head, tubercled apparently onthe outer surface; and mi
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