British Conchology, or an Account of the Mollusca Which Now Inhabit the British Isles and the Surrounding Seas Volume 3 by John Gwyn Jeffreys
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. 1865 Excerpt: ...the shell from the opening at the smaller end. He discovered the Dentalium at low-water mark, where its presence was betrayed by a small groove in the sand; and he seems to have got a knack of finding them, for he says he easily procured 200 live specimens at the recess of a single high spring tide. They prefer certain spots, especially patches of coarse sand mixed with broken shells and interspersed with Zostera. In this part of his researches he derived much assistance from the hydrographical survey of France, the minute accuracy of which he greatly praises, not merely as regards zoology, but as subservient to the navigation of the coast. I fear we cannot say so much for ourselves on this side of the Channel, when we reflect on the shameful delay that takes place in the publication of our charts, and even now find that the hydrographical survey on the west of Scotland has been stopped. All we can boast of is a long annual list of wrecks. We are a people that have had losses; like Dogberry, we can afford them: but a superabundance of wealth will not restore drowned mariners to life. The Dentalium is hardy, and apparently abstemious. Lacaze-Duthiers kept some alive in a flask of sea-water with a little sand for more than eighteen months. It is much more active at night, and sensible of light. A ray of the sun or the flame of a candle will cause it to withdraw its foot. This organ acts as a piston in expelling at the other end the eggs and seminal fluid, as well as perhaps the faeces and exhausted water. The point of the young shell is pear-shaped, and bears some resemblance to a baby's feeding-bottle with the hole at one end instead of in the middle. It is broken off when too small to contain the terminal tube or process of the mantle; and this part of the ...
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