File:The Quarterly journal of the Geological Society of London (1881) (14768335224).jpg

Identifier: quarterlyjourna371881geol (find matches)
Title: The Quarterly journal of the Geological Society of London
Year: 1845 (1840s)
Authors: Geological Society of London
Subjects: Geology
Publisher: London (etc.)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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wer face is less than two thirds that of the uppersurface of the radials (fig. 26). But the top stem-joint, on which thecalyx rests, only expands a little from its lower to its upper margin,and its increase in thickness over the one below it is far less marked * Das Elbthalgebirge in Sachsen, Palseontographica, Baud xx. Theil 2,pp. 18, 19. t Histoire naturelle generate et particuliere des Crinoides vivans et fossiles(Paris, 1840), pp. 95, 96. ; Thanks to the kindness of Prof. Geinitz, who has made a second exami-nation of this specimen, I am enabled to give a slightly more accurate figureof it than that published by him in the Elbthalgebirge (Taf. vi. fig. 9a).In the older figure only two joints are represented between the calyx and theenlargement on the stem. In that given here three joints are shown instead oftwo, this later interpretation of the markings on the upper part of the stembeing considered by Prof. Geinitz to be the more accurate one. Quart. Journ. Geo! Soc VolZXXVLLH .VL
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THE TTPPEK CHALK OF S0UTHEEN SWEDEN. 329 than is the case in Bourgueticrinus. Both it and the joints imme-diately below it are decidedly smaller than those forming the lowerpart of the stem, which is just the reverse of what we find in Bour-gueticrinus. Prof. Geinitz was unable therefore to refer this specimen toBourgueticrinus, despite the resemblance of its stem-joints to thoseof that type; but he supposed it to belong to the genus Antedon onaccount of the resemblance of its calyx to that of Ant. Sarsii, asrepresented by M. Sars in his well-known Memoires pour servir ala connaissance des Crinoides vivants. In the specimens figuredby Sars*, the upper end of the stem is not thickened, and thecalyx widens from its base to the upper end of the first radial, justas in the fossil from Strehlen (Geinitz f). This resemblance is butan imperfect one, however; for Sarss specimens were merely thestalked larvae of Ant. Sarsii, not more than an inch long. In thelater stages of these larvaaj the u

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