This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1889 edition. Excerpt: ...plications. A marked illustration of this is afforded by an individual which, in repairing an injury to its shell, has abruptly developed six plications on one side of the sinus, in continuation of three and to correspondwith three on the opposite side.. I The absence of plications in the sinus. This ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1889 edition. Excerpt: ...plications. A marked illustration of this is afforded by an individual which, in repairing an injury to its shell, has abruptly developed six plications on one side of the sinus, in continuation of three and to correspondwith three on the opposite side.. I The absence of plications in the sinus. This is a feature of rare occurrence, and is undoubtedly an infantile character retained in later stages of grovth. A single individual of immature growth affords an illustration of a peculiar abnormality, indicating a reversal in the growth to an embryonic condition. This shell (plate.5, figs. 3, 3a) has grown to a certain size and normally developed its plications, but an abrupt period has been placed to their development, and over the entire anterior portion of the individual, in front of a stout varix, the surface of the shell is almost smooth. This is the exact counterpart of that mode of growth, to which attention is called under other species, where the smooth embryonic condition of the shell seems to be prolonged for more than the usual period of immaturity, and the mature features are thereupon abruptly developed after the formation of a sharp growth-line. DEVELOPMENTAL VARIATIONS-' Our series of individuals illustrating the embryological changes in this species is so complete as to show by almost imperceptible gradations the entire chain of development from very near the starting point up to matur ity. This series begins with an individual measuring I mm. in length and 58 MEMOIRS OF THE STATE MUSEUM.8 mm. in width, and at this stage of growth, the incipient shell has mani-festly not received much increment. That this, however, is not the actual primitive shell seems proven by indications of two very indistinct con-centric growth-lines, ...
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Add this copy of The Development of Some Silurian Brachiopoda to cart. $19.98, Sold by Zubal Books rated 4.0 out of 5 stars, ships from Cleveland, OH, UNITED STATES, published 1889 by Albany: University of the State of New York.
Edition:
1889, Albany: University of the State of New York
Hardcover
Details:
Publisher:
Albany: University of the State of New York
Published:
1889
Language:
English
Alibris ID:
17763550740
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Seller's Description:
Quarto, 95 pp., 8 plates wirh printed guards, issued as Memoirs of the New York State Museum, Volume 1, Number 1; ex library, original boards badly worn with sides almost detached, working copy only, . -If you are reading this, this item is actually (physically) in our stock and ready for shipment once ordered. We are not bookjackers. Buyer is responsible for any additional duties, taxes, or fees required by recipient's country.
Add this copy of The Development of Some Silurian Brachiopoda to cart. $37.63, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Wentworth Press.
