Petrificata Derbiensia: Or, Figures and Descriptions of Petrifactions Collected in Derbyshire, Volume 1 (Google eBook)

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D. Lyon, 1809 - Paleontology - 28 pages
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Page viii - Outlines of an Attempt to establish a Knowledge of Extraneous Fossils on Scientific Principles.
Page lxvii - Whitehurst, in his Inquiry into the original State and Formation of the Earth, contends, that subterraneous fire, and the steam generated from it, are the true and real causes of earthquakes.
Page 69 - Davila•, and described by him as two slender, gristly ligaments, proceeding from each side of the inner part, of the beak, and returning to it again after various involutions. The furrows, surrounding the upper gibbosities of our fossil, are probably impressions from these appendages ; or, at least, from some other bodies of a like nature.
Page 69 - Near the beak of the nucleus arise two large, rounded gibbosities, one on each side, somewhat flattened, wrinkled on the surface, and surrounded by a strong furrow ; beneath these, towards the margin, two others, generally less in diameter, but more convex or prominent, and with their surface smooth, without furrows or wrinkles. It is evident, that these prominences in the cast, must have taken their form frOm cavities...
Page 44 - The above described parts are all that are ever present in the fossil. — And as the under side is constantly filled with the stone which constitutes the matrix, it would be impossible to examine the legs and inferior parts of the abdomen, did they remain, which it is evident, however, they do not ; the petrifaction being formed merely from the upper shell, or żovering of the back and head.
Page 45 - Anomite, which I have not as yet named or described, the hinge is still less, and the beak of the large valve, instead of being straight, is somewhat incurved, as in A.
Page 44 - The middle parts of the segments are more elevated than those on each side, and form collectively, down the back, a keel-shaped prominence, which ends somewhat obtusely, before it reaches the margin of the tail. The segments of the keel directly transverse, those on each side, particularly near the tail, somewhat oblique. The tail obtuse, entire, and destitute of any appendage. The above described parts are all that are ever present in the fossil.
Page 49 - Valves convex, semicircular, marked with deep, longitudinal, equal striae. Hinge patulous, straight, but not extending the whole breadth of the shell. Foramen triangular, large. Beak of the perforated valve prominent, pointed, incurved ; the other short and obtuse. Margin acutely cre'nate, and furnished with a large angular sinus, causing a somewhat strong plicature on the surface of the valves.
Page 69 - It is evident, that these prominences in the cast, must have taken their form frOm cavities on the inner surface of the original shell ; the use of these cavities, however, it will be scarcely possible to ascertain — Perhaps those near the beak might contain the twisted appendages which are peculiar to the genus anomia, and which were first noticed, we believe, by Davila•...
Page 34 - Involuted, somewhat globose, imperforate, striated ; the strias close, acute, transverse, but oblique on the sides, and united by a single, narrow, dorsal line at the ambit. The mouth or aperture large, and somewhat extended on each side. The form and situation of the dissepiments are unknown. Now and then found in our limestone, but not frequent.

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