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II.—Notes on Chondrosteus acipenseroides, Agassiz

Published online by Cambridge University Press:  01 May 2009

R. H. Traquair
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Extract

The now well-known Liassic Acipenseroid fish Chondrosteus acipenseroides was named by Agassiz in 1843, but not described by him. It subsequently formed the subject of an elaborate memoir by Sir Philip Grey-Egerton, Bart., in which, besides giving a minute account of the structure of the genus, he named two additional species—C. pachyurus and C. crassior. Putting the results of Sir Philip's investigations as briefly as possible, he maintained that while “in all essential points” Chondrosteus resembled the recent Sturgeon, nevertheless in certain others, and notably in the structure of the opercular and hyoid regions, it constituted a transitional form towards the more ordinary Ganoids. Moreover, the skin of the body presented the same naked condition seen in the recent Polyodon.

Type
Original Articles
Information
Geological Magazine , Volume 4 , Issue 6 , June 1887 , pp. 248 - 257
Copyright
Copyright © Cambridge University Press 1887

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References

page 248 note 1 Poissons Fossiles, t. ii. pt. 2, p. 280.Google Scholar

page 248 note 2 Phil. Trans. vol. 148 (1858), pp. 871–885.CrossRefGoogle Scholar

page 248 note 3 Q. J. G. S. vol. xxii. (1866), p. 586.Google Scholar

page 248 note 4 Ganoid Fishes of the British Carboniferous Formations, Pt. Palæoiiiscidæ, I., p. 42, Pal. Soc. 1877.Google Scholar

page 253 note 1 Described as “interoperculum” in my Memoir on the Structure of the Palæoniscidæ. I have, however, abandoned that view, and now consider the plate intercalated between it and the operculum in such genera as Rhabdolepis to be not a suboperculum, but merely an accessory element.

page 253 note 2 “On the Structure and Development of the Skull in Sturgeons,” Phil. Trans. vol. 173 (1881), p. 172.Google Scholar

page 253 note 3 See Stannius, , “Handbuch der Zootomie der Wirbelthiere,” erster Theil, Die Fische, p. 53.Google Scholar

page 254 note 1 Op. cit. p. 172.Google Scholar