This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888 Excerpt: ...rootlets extend below the regular joints. By expansion at the ends or sides of these rootlets the animals attach themselves to any foreign body they happen to find in the deep ooze in which they become anchored; when once fixed, they probably remain so for life. The stem joints of the Bourgueticrinidae are movable upon ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888 Excerpt: ...rootlets extend below the regular joints. By expansion at the ends or sides of these rootlets the animals attach themselves to any foreign body they happen to find in the deep ooze in which they become anchored; when once fixed, they probably remain so for life. The stem joints of the Bourgueticrinidae are movable upon one another; they are not uniformly discoielal, like those of the Pentacrinidae, but are strung as it were upon five tendons of variable length. Agassiz, who watched the movements of Rhizocrinus Rawsoni, says: --"When contracted, the pinnules are pressed against the arms, and the arms themselves shut against one another, so that the whole looks like a brush made up of a few long coarse twines. When the animal opens, the arms at first separate without bending, but gradually the tip of the arms bends outwards as the arms diverge more and more, and when fully expanded the crown has the appearance of a lily. I have not been able to detect any motion in the stem traceable to contraction, though there is no stiffness in its bearing. When disturbed, the pinnules of the arms first contract, the arms straighten themselves out, and the whole gradually and slowly closes up. It was a very impressive sight for me to watch the movements of this creature, for it told not of its own way only, but at the same time afforded a glimpse into the countless ages of the past, when these crinoids, so rarely seen nowadays, formed a prominent feature of the animal kingdom. I could see, without great effort of the imagination, the shoal of Lockport, teeming with the many genera of crinoids which the geologists of New York have rescued from that prolific silurian deposit, or recall the formation of my native country, in the hillsides of which, also among fossils indi...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
