File:The Quarterly journal of the Geological Society of London (12961575604).jpg

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MASON DAKOSAURUS.
219
It is noticed by Prof. Owen*, who rightly includes it among his

  • ' amphica3lian " Crocodilia.

Teeth of Bakosaurus are said to occur, associated with remains of
PUosaurus, Gyrodus, Sjyhcerodus gig as, &c., in the Potton Sands de-
scribed by Mr. Seeley ; these are its companions, both in the Upper
AATiite Jura of Schnaitheim and in the Kimmeridge Clay of England.
Mr. ^alkert also mentions it as occurring in beds probably of the same
age at Upware, in the Pens of Cambridge, and in similar company.
I have examined, through the kindness of Mr. "W. Davies, a suite
of the Potton fossils at the British Museum ; but it would be almost
impossible, owing to the worn condition of these fossils, which have
evidently been derived from older rocks, to determine with any de-
gree of certainty its presence among them.
The British Museum contains numerous specimens of Dakosaurus
from the German locality, as well as a single tooth from the Kim-
meridge Clay of Boulogne and one from that of Ely, near Cambridge.
A comparison of these with the teeth from Oxford fails to discover
differences of specific value ; I therefore propose to retain M. Quen-
stedt's name of maximus for the latter.
Fig, 3.
Fig. 4.
a. External view of tooth of Dakosaurus, the
ridges forming the contour lines. Side view of an anterior
b. The same tooth, showing the pulp-cavity. tooth of Dakosaurus.
This genus is characterized by large, conical, incurved and slightly
recurved teeth, the smooth and polished enamelled crowns of which
are traversed by two sharp, prominent, minutely crenulated longi-
tudinal ridges, one forming the posterior, the other the anterior
margin of the tooth ; these ridges are situated midway between
the convex and concave curvatures of the tooth," which is compressed
at the apex so as to give in transverse section a slightly oval figure
pointed before and behind ; but this character dies away towards the
base, where the crown becomes cylindrical and ceases to be inter-
rupted by the ridges ; one of these, the anterior, is lost sooner than
the other, which is continued a short distance into the cement-

  • Palgeontology, 2nd edit, p 300. t Geol. Mag. vol iv. p. 309.
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Source https://www.flickr.com/photos/biodivlibrary/12961575604
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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36103064
Item ID
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111288 (Find related Wikimedia Commons images)
Title ID
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51125
Page numbers
InfoField
Page 219
BHL Page URL
InfoField
https://www.biodiversitylibrary.org/page/36103064
Page type
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Text
Flickr sets
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  • The Quarterly journal of the Geological Society of London. v. 25 (1869).
Flickr tags
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Flickr posted date
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6 March 2014
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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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26 August 2015

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current15:06, 26 August 2015Thumbnail for version as of 15:06, 26 August 20151,185 × 2,056 (509 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/12961575604 | description = MASON DAKOSAURUS. <br> 219 <br> It is noticed by Prof. Owen*, who rightl...

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