File:The Quarterly journal of the Geological Society of London (12471589744).jpg

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1865..
DTTKCAN — ASIATIC ECHINODERMATA.
355
Chalk in the form of a variety which is subconical and not so much
depressed as the type, and that both have five generative pores.
The small tubercles, which are crenulated and perforated, the
position of the anus, and the general form of the test are repeated
sufficiently to admit the following under one species. The series will
then stand thus : — Holectypus Cenomanensis, Gueranger. Varieties :
1. some French unnamed forms, which vary very slightly from the
type ; 2. var. 1, from South-eastern Arabia ; 3. var. 2, from South-
eastern Arabia ; 4. var. Turonensis, from the Lower and Upper Chalk ;
5. Yav.planatus, from Texas. The species follows the law, that those
widely dispersed vary greatly ; and its great diffusion, both in area
and in depth, is very remarkable.
II. CiDAUis CENOMANENSIS, Cottcau. The variety of this species
differs from the type in having the second or internal two rows of
grannies in the ambulacral spaces barely developed. The primary
or external rows are like those of the type, and extend to the summit,
occupying the interporiferous zone for some distance. This difference
is insufficient to be specific ; but its recognition as pertaining to a
variety throws some doubt on the propriety of separating C. Ceno-
manensis from 0. vesiculosa, these species differing only in the granu-
lation of their ambulacral spaces.
III. Hemiasteb similis, D'Orb. There is a variety of this species
in South-eastern Arabia, and a second at Bagh. Both have wider
spaces between the rows of pores in the ambulacra than the type,
and the test is generally more globular than in the European speci-
mens ; moreover the posterior ambulacral areas are a little longer
than in the type, but stiU they are very short. The Bagh variety is
broader and more globular than the South-eastern Arabian.
Figs. 2-4. — Illustrating the structure of Cottaldia Carteri.
Fisj. 2.
Fiff. 4
Fig. 2.
3.
Cottaldia Carteri: side view, natural size.
The same : diagram of the apical disk.

4. The rame : diagram of an ambulacral space, poriferous rones, &c.
Date
Source https://www.flickr.com/photos/biodivlibrary/12471589744
Author Geological Society of London
Full title
InfoField
The Quarterly journal of the Geological Society of London.
Page ID
InfoField
34892029
Item ID
InfoField
108495 (Find related Wikimedia Commons images)
Title ID
InfoField
51125
Page numbers
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Page 355
Names
InfoField
NameFound:Cenomanensis NameFound:Cottaldia NameConfirmed:Cottaldia EOLID:4711555 NameBankID:4127076 NameFound:Echinodermata NameConfirmed:Echinodermata EOLID:1926 NameBankID:2560154 NameFound:Hemiasteb similis NameConfirmed:Hemiaster (Hemiaster) similaris Stoliczka 1873 NameFound:Holectypus NameConfirmed:Holectypus EOLID:4710484 NameBankID:4196506
BHL Page URL
InfoField
https://www.biodiversitylibrary.org/page/34892029
Page type
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Text
Flickr sets
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  • The Quarterly journal of the Geological Society of London. v. 21 (1865)
Flickr tags
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Flickr posted date
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12 February 2014
Credit
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This file comes from the Biodiversity Heritage Library.

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Date/TimeThumbnailDimensionsUserComment
current10:01, 12 October 2021Thumbnail for version as of 10:01, 12 October 20211,880 × 3,200 (1.4 MB)SteinsplitterBot (talk | contribs)Bot: Image rotated by 270°
23:40, 26 August 2015Thumbnail for version as of 23:40, 26 August 20153,200 × 1,880 (1.41 MB)Fæ (talk | contribs)== {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/12471589744 | description = 1865.. <br> DTTKCAN — ASIATIC ECHINODERMATA. <br> 355 <br> Chalk in th...

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