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III.—Note on the Species ‘Am. Plicatilis’ and ‘Am. Biplex’ of Sowerby
Published online by Cambridge University Press: 01 May 2009
Extract
The old question of the proper interpretation of these names, which was raised by Professors Nikitin and Pavlov, after their visit to this country for the Geological Congress in 1888 to whom no reply was made, for their conclusions could scarcely be denied, has been raised again by Miss Healy in a communication to the Quart. Journ. Geol. Soc., Feb. 1904. As these conclusions do not appear to be well known, it may be as well to quote them. Nikitin says: “Having found in the British Museum the original of Am. biplex, Sow. (tab. 293, fig. 1), I assured myself that that original presented absolutely the Oxfordian form of Perisphinctes of the group of P. plieatilis, by the character of its numerous straight rounded ribs, by the mode of enrolment, by the constriction of its perfectly visible whorls, and lastly by the matrix; it showed no resemblance to the Kimmeridgian and Portlandian forms described in France and England under this name… Mr. Loriol had not seen the original of Sowerby… but having received from England, under the name of A. biplex, Sow., the Portlandian forms, he was justified in giving this name to the same form from Boulogne. On studying the English Kimmeridgian forms placed in the museums of England under the name of A. biplex I found amongst them the typical form of A. Pallasi, D'Orb.’
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References
page 163 note 1 “Excursions dans les Musees, etc., de l'Europe occidentale”: Bull. Soc. Belge Géol., torn. iii.
page 163 note 2 “Etudes sur les couches Jurassiques et Crétacées de la Russie.”
page 163 note 3 “Strata between the Chalk and the Oxford Oolite.”
page 163 note 4 “Geology of Yorkshire,” p. 102.
page 165 note 1 The spelling of Buckland, probably an oversight, as corrected by Phillips.
page 165 note 2 Supposed at first to be from Osmington, but this shows that it was not so.
page 165 note 3 After the proof afforded by Mr. Crick of the Cornbrash age of Nautilus truneatus, stated by Sowerby to be from the Lias of Keynsham, we cannot place too much reliance on the localities given by the latter.