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Arkell.1956.Jurassic..

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EXPLANATIONS OF PLATES 31-46<br />

Illustrations of the principal zonal index ammonites of the Jurassic, mainly<br />

from the type specimens.<br />

Plates 31-41, Hettangian to Portlandian of the North-west European province.<br />

Plate 42, Oxfordian and Kimeridgian of the Tethys.<br />

Plates 43-44, Tithonian of the western Tethys.<br />

Plates 45-46, Volgian of Russia.<br />

(20 of the 95 species here figured are from photos reproduced from my Jurassic<br />

System in Great Britain, 1933, by kind permission of the Oxford University<br />

Press.)<br />

The 'Opinions' referred to are decisions of the International Commission<br />

on Zoological Nomenclature, published during 1953-5 m<br />

their Bulletin, upon<br />

problems of nomenclature submitted to them by the author with the object of<br />

protecting and stabilizing the names of zonal index ammonites.<br />

759<br />

http://jurassic.ru/

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