File:The Quarterly journal of the Geological Society of London (13889846528).jpg

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THE AMBTJLACEA OF FOSSIL ECHTNOIDEA.
43S
It appears consistent with the results of these researches to decide
that the genus Pseudodiadema should be restricted to the forms with
triple plates, with an occasional extra plate in the nature of a demi-
plate ; that is, to groups one and two. Of such a genus the spe-
cies placed in the following list may be taken as common forms : —
Pseudodiadema Moorei, Wright ; P. depressum. Ag. ; P. radiatum,
Wright ; P. Balcerioe, Woodw. ; P. priscum, Cott. ; P. incequale, Des. ;
P. WrigJitii, Cott. ; P. prisciniacense, Cott. ; P. rotulare, Ag. ; P.
Benettia;, Porbes ; P. ornatum, Goldf. ; and the species which has
been partly described in this communication. Pseudodiadema
Brongniarti, Ag., and P. Bailyi, Wright, may be taken as good
examples of the subgroup with an occasional demi-plate ; and of
course P. Jiemisplicericum is the type.
On the other hand, the species with at least four and with five
pairs of pores or more, both in forms not full-grown and adult,
should be ranged in another genus — Plesiodiadema. Under this
genus will be arranged the species P. mamillanum, Eomer ; P.
Michelini, Ag. ; P. Blmicheti, Des. ; P. Verneuilii, Cott. ; P. tenuis,
Des. : P. annulare^ Desor, &c.
Pig. 9 (see p. 452).
III.
- IV.
Genus Pedina, Agass.
The diagnosis of Pedina (an Oolitic genus) has been partly
noticed (page 422), and it is now necessary to determine what dis-
tinction the obliquity of the triple pairs of pores makes in the shape
of the plates.
Taking Pedina Smithii, Wright, as the type, an examination of
the specimen in the late Dr. Wright's collection indicates that
the ambulacra are different from those of Hemii^edina. The
arrangement of the triplets of pores is to a certain extent like that
in typical recent Triplechinidae, and the first or aboral pair (fig. 9, c)
of each series of three in one line is, as in the recent forms, the
adoral or actinal pair of a triple compound plate, and is situated
much nearer the median line of the ambulacrum than the pair

immediately above (fig. 9, h). The pairs are in oblique series of three,
Date
Source https://www.flickr.com/photos/biodivlibrary/13889846528
Author Geological Society of London
Full title
InfoField
The Quarterly journal of the Geological Society of London.
Page ID
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37047303
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 433
Names
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NameFound:Echtnoidea NameFound:Jiemisplicericum NameFound:Michelini NameFound:P. incequale NameFound:P. prisciniacense NameFound:P. rotulare NameFound:Pedina NameConfirmed:Pedina EOLID:13205073 NameBankID:4286190 NameFound:Plesiodiadema NameConfirmed:Plesiodiadema EOLID:73072 NameBankID:2765287 NameFound:Plesiodiadema annulare NameConfirmed:Plesiodiadema EOLID:73072 NameBankID:2765287 NameFound:Plesiodiadema mamillanum NameConfirmed:Plesiodiadema EOLID:73072 NameBankID:2765287 NameFound:Plesiodiadema tenuis NameConfirmed:Plesiodiadema EOLID:73072 NameBankID:2765287 NameFound:Pseudodiadema NameConfirmed:Pseudodiadema EOLID:4711764 NameBankID:4318037 NameFound:Pseudodiadema depressum NameConfirmed:Pseudodiadema depressum NameFound:Pseudodiadema ornatum NameConfirmed:Pseudodiadema ornatum NameFound:Pseudodiadema priscum NameConfirmed:Pseudodiadema (Trochotiara) priscum NameFound:Pseudodiadema radiatum NameConfirmed:Pseudophasma radiatum (Scudder, S.H. 1875) EOLID:1077125 NameFound:Triplechinidae NameConfirmed:Triplechinidae
BHL Page URL
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https://www.biodiversitylibrary.org/page/37047303
Page type
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Text
Flickr sets
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  • The Quarterly journal of the Geological Society of London. v. 41 (1885).
Flickr tags
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Flickr posted date
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30 April 2014
Credit
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This file comes from the Biodiversity Heritage Library.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.


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current04:16, 26 August 2015Thumbnail for version as of 04:16, 26 August 20151,192 × 2,078 (444 KB) (talk | contribs)== {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13889846528 | description = THE AMBTJLACEA OF FOSSIL ECHTNOIDEA. <br> 43S <br> It appears consistent...

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