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VI.—Note on the Genera Tristychius and Ptychacanthus, Agassiz

Published online by Cambridge University Press:  01 May 2009

R. H. Traquair
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Extract

Some years ago, in showing that the spines supposed by Hancock and Atthey to be dorsal spines of Gyracanthus were merely young and unworn specimens of lateral spines of the same genus, I called attention to the general fact that young examples of Selachian spines could not be expected to represent the older ones in miniature, and vice versa.

Type
Original Articles
Information
Geological Magazine , Volume 6 , Issue 1 , January 1889 , pp. 27 - 28
Copyright
Copyright © Cambridge University Press 1889

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References

page 27 note 2 Ann. and Mag. Nat. Hist. ser. 5, vol. xiii. 1884, p. 37.Google Scholar