Shell life; an introduction to the British mollusca

 
9781236476562: Shell life; an introduction to the British mollusca
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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. 1901 edition. Excerpt: ...a black head--shows its relationship to the Top-shells by its possession of a strong snout. It has long tentacles, almost transparent, streaked with black; and large black eyes on short foot-stalks. It is found in clear gravel-bottomed rivers, sparingly at the mouth where the water is brackish; more frequently in the upper reaches. The globular egg-capsules are usually deposited on the shell of another individual, and a singular provision is made for the welfare of the young--though at seemingly great expense. Each capsule contains 50 or 60 eggs, but only one embryo is permitted to develop, and this sets to work to demolish its brothers and sisters. VERY large number of species now to be described constitute the sub-order Monotocardia--the mollusks that have only one auricle to the heart, a single gill-plume (the left), one kidney, the nervous system more concentrated, and mostly with a proboscis. The Violet-snails (lanihina), of which several species are found washed upon our western shores, are not natives, but their shells are so frequently found in a fresh state, if not tenanted by the living mollusk, that some general reference to them is necessary. They are what are termed pelagic species--living entirely at the surface of the sea, where they feed upon the smaller species of jelly-fishes. The destruction of Velella in this way led to the supposition in the eighteenth century that lanthinu produced the Velelke, which were seen apparently issuing from its mouth. For such a mode of life their shell must be thin and lidit, and to enable them to float unnoticed by sea-birds and fishes it is coloured violet, the lower whorls, which are most exposed from above when the creature floats, beinjj of a darker tint, whilst the upper whorls may be white....

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Step, Edward
Published by RareBooksClub.com (2012)
ISBN 10: 1236476565 ISBN 13: 9781236476562
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Book Description RareBooksClub.com, 2012. Paperback. Condition: New. This item is printed on demand. Seller Inventory # INGM9781236476562

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