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VI.—Archæodiadema, a New Genus of Liassic Echinoidea

Published online by Cambridge University Press:  01 May 2009

Extract

Owing to the absence from England of any marine fossils of Triassic age—except the few obscure shells described by Mr. R. B. Newton—the Lias yields the first English representatives of the Neozoic Echinoidea. The fauna is not rich in species, and as a rule the specimens are small; but it is of interest, as its members are primitive in character, and as they foreshadow many of the main lines of evolution followed by the rich Echinoid faunas of the Oolites. Some months ago Mr. Beeby Thompson showed me some specimens from the Upper Lias of Northamptonshire, which form an interesting addition to the primitive types of Liassic Echinoidea; they belong to a new genus, which is the simplest known form of the Diadematinæ, and occupies the same relation to the remaining members of that subfamily that Eodiadema occupies to the Orthopsinæ.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 1896

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References

page 317 note 1 Newton, R. B., “Note on some Molluscan Remains lately discovered in the English Keuper”: Journ. Conch., vol. vii, Nos. 11 and 12, 18941895, pp. 408–13.Google Scholar

page 317 note 2 Duncan, P. M., “Revision of the Genera and Great Groups of the Echinoidea”: Journ. Linn. Soc., vol. xxiii, 1890, pp. 58–9.Google Scholar

page 319 note 1 Quenstedt, “Handb. d. Petref.,” 1852, p. 582, pl. xlix, fig. 37; also in “Petref. Deutsch.,” Bd. iii, 1874, p. 349, pl. lxxiv, figs. 10, 11.

page 319 note 2 Desor, and De Loriol, , “Echinol. helvét.,” 1871, p. 194, pl. xxxiii, fig. 3.Google Scholar

page 319 note 3 Cotteau, , “Pal. franç. Terr. jurass.,” t. x, pt. 2; “Echinides réguliers,” livr. ii, 1883, pl. cccxciii.Google Scholar

page 319 note 4 Thompson, Beeby, “The Upper Lias of Northamptonshire”, part vi: Journ. Northampton Nat. Hist. Field Club, vol. v, 1888, p. 54Google Scholar; the section is described on p. 63.