File:The Quarterly journal of the Geological Society of London (13889746329).jpg

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LOWER SILURIAN' ROCKS NEAR WELSHPOOL, WALES.
Fig, 2, — Tliainniscus antiquus, Sj9, n.
111
A. The specimen, enlarged 2 diameters,
B, C, D. Details more highly magnified.
2. Thamniscijs antiquus, sp. n. Fig. 2.
Zoarium apparently springing from a root-like base, strong and
thick towards the bottom, where several root-branches appear to be
united, more delicate towards the younger or growing portion of
the zoarium. Branches frequently dichotomising, free. Zocecia
tubular, shown on one side only of the branch. Tubular cells not
contiguous, rather broad at the openings, gradually thinning out
towards the axial region of the zoarium : cell-mouths, so far as I
can make out, rather elongated, peristomes not prominent, reverse
striated ?
Formation. Imbedded in volcanic ash, probably of the age of
the Bala rocks.
Locality. Middleton Hill, near "Welshpool.
Cahinet. J". B. Morgan, Esq., Welshpool; one specimen.
This beautiful specimen, which I have drawn magnified about
four diameters, is buried in volcanic ash, which is so friable that it
breaks away with the least touch. It is very certain that it is the
reverse surface that is exposed ; but towards the bottom the thick-
ened branch is broken away, and the cells are exposed. The
appearance of the branch at this part is shown in fig. 2, b ;
but when more highly magnified the arrangement of the cells is
seen to be pretty regular, and is shown in fig. 2, c. By extracting a
minute fragment of the specimen from the matrix, I have been able
to expose the poriferous surface, and this is shown in fig. 2, d.
So far as I am able to judge by carefully manipulating this delicate
fossil, I can almost confidently assert that the species now described
dijffers considerably from the species previously described by myself *
Quart. Journ. Greol. Soc. vol. xxxviii. p.

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Source https://www.flickr.com/photos/biodivlibrary/13889746329
Author Geological Society of London
Full title
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The Quarterly journal of the Geological Society of London.
Page ID
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37046953
Item ID
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114009 (Find related Wikimedia Commons images)
Title ID
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51125
Page numbers
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Page 111
Names
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NameFound:Thamniscijs antiquus sp NameConfirmed:Thamniscus antiquus NameFound:Tliainniscus antiquus NameFound:Zoarium
BHL Page URL
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https://www.biodiversitylibrary.org/page/37046953
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Text
Flickr sets
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  • The Quarterly journal of the Geological Society of London. v. 41 (1885).
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Flickr posted date
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30 April 2014
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This file comes from the Biodiversity Heritage Library.

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This image was originally posted to Flickr by BioDivLibrary at https://flickr.com/photos/61021753@N02/13889746329. It was reviewed on 26 August 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

26 August 2015

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current04:28, 26 August 2015Thumbnail for version as of 04:28, 26 August 20151,183 × 2,018 (417 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13889746329 | description = LOWER SILURIAN' ROCKS NEAR WELSHPOOL, WALES. <br> Fig, 2, — Tliainnisc...

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