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The Sipunculids of the Eastern Coast of North America (Paperback) Loot Price: R331 Discovery Miles 3 310
The Sipunculids of the Eastern Coast of North America (Paperback): John Hiram Gerould
The Sipunculids of the Eastern Coast of North America (Paperback): John Hiram Gerould

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The Sipunculids of the Eastern Coast of North America (Paperback)

John Hiram Gerould

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Loot Price R331 Discovery Miles 3 310

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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. 1913 Excerpt: ... shell or the tube inhabited by individuals of this species from off the American coast is partially closed with a hollow cone composed of a cement made of mud or fine sand, often inclosing minute pebbles, and held together by a secretion. These cones sometimes rise as much as 5 mm. above the mouth of the shell in the form of a funnel. I have found a small amount of cemented muddy sand in shells of Dentalium occupied by Ph. strombi from the west coast of Sweden, sent me through the kindness of Prof. Hj. Theel, though I judge from the fact that no mention has been made by European observers of cement formation in this species that it never is a conspicuous phenomenon in shells occupied by Ph. strombi in Europe, these shells being lined with loose mud or sand. It was chiefly on the basis of this habit of cementing together the muddy sand that Quatrefages (1865) observed in specimens from North America that he gave the rfame Sipuncvlus cstmentarius to these specimens. The tubes of cement are usually slightly curved, and are marked on the exterior at regular intervals by annular furrows. (PI. 60, fig. 10.) The color of the animal varies from a very dark brown or a grayishbrown (variety tubicola), orange-brown or yellowish-brown (variety fused) to white (variety alia). The dark brown specimens from certain regions have a decidedly purple hue, which is especially common in the grayish-brown individuals that live in Pectinaria tubes. Light yellowish-brown or orange-brown is the color of the widely distributed typical form, as seen in specimens from Labrador, the coast of Nova Scotia, from off Eastport, off Point Judith, and farther south. The color of the local varieties will be mentioned in the descriptions that are to follow. There are 16 tentacles (pl. 60, fig....


Imprint: Rarebooksclub.com
Country of origin: United States
Release date: March 2012
First published: March 2012
Authors: John Hiram Gerould
Dimensions: 246 x 189 x 2mm (L x W x T)
Format: Paperback - Trade
Pages: 30
ISBN-13: 978-1-130-36776-8
Barcode: 9781130367768
Categories: Books > Humanities > History
Books > Humanities > History > General
Books > History > General
LSN: 1-130-36776-2

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