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I.—On a New Species of Dipterus

Published online by Cambridge University Press:  01 May 2009

R. H. Traquair
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Extract

From the Old Red Sandstone of Caithness, four species of Dipterus were originally named by Sedgwick and Murchison, those being as follows:—

1. Dipterus brachypygopterus, anal fin short.

2. D. macropygopterus, anal fin long.

3. D. Valenciennesii, small in size, narrow in shape.

4. D. macrolepidotus, not characterized although figured.

It is evident from the figures of “D. macrolepidotus” that it does not belong to the same genus, even to the same family, as the other forms. Those have circular scales, whereas in “macrolepidotus,” the scales are rhombic, and the head bones are clearly seen to be very different from those of Dipterus.

Type
Original Articles
Information
Geological Magazine , Volume 6 , Issue 3 , March 1889 , pp. 97 - 99
Copyright
Copyright © Cambridge University Press 1889

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References

page 97 note 1 Trans. Geol. Soc. 2nd ser. vol. iii. p. 143, tab. 15–17, 1829.Google Scholar

page 97 note 2 Recherches Poissons Foss. Tome i. 1835–1843, p. 115.Google Scholar

page 97 note 3 Brit. Pal. Foss. Fasc. iii. 1855, pp. 590–592 Google Scholar. I have made “macrolepidotus” the type of my new genus Thursius, GEOL. MAG. November, 1888.

page 97 note 4 1861 Edition, p. 57.

page 97 note 5 Pander, (Dr. C. H.) u. d. Ctenodipterinen d. Devonischen Syst. 1858, St. Petersburg, pp. 1–32.Google Scholar

page 98 note 1 Trans. Royal Soc. Edin. vol. xxviii. p. 452.Google Scholar

page 98 note 2 Geol. Mag. for November, 1888.