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VI.—The Classification of the Phacopidæ

Published online by Cambridge University Press:  01 May 2009

F. R. Cowper Reed
F. R. Cowper Reed
Affiliation:
of the Sedgwick Museum, Cambridge.
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Extract

The family of Trilobites termed Phacopidæ has been defined by Beecher as follows:—“Glabella tumid, widest in front. Free cheeks continuous, united anteriorly. Suture extending from in front of the genal angles inward to the eyes, and thence forward around the glabella. Eyes generally large, always with distinct facets, schizochroal. Thorax of eleven segments with grooved pleura. Pygidium usually large and of many segments; limb ribbed; margin entire or dentate.”

Type
Original Articles
Information
Geological Magazine , Volume 2 , Issue 4 , April 1905 , pp. 172 - 178
Copyright
Copyright © Cambridge University Press 1905

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References

page 172 note 1 Beecher, , Amer. Journ. Sci., vol. iii (1897), p. 202; and in Zittel's “Textbook of Palæontology” (English translation, 1900), p. 636.Google Scholar

page 172 note 2 Hall, & Clarke, : Psalæont. New York, vol. vii, pp. xxvii–xxxii.Google Scholar

page 173 note 1 Hall & Clarke: op. cit., p. 45.

page 173 note 2 Salter, : Mem. Geol. Surv., dec. ii, 1849, art. 1, p. 8.Google Scholar

page 173 note 3 Kayser, : “Die Fauna ält. Dev. Ablag. Harzes,” p. 33 (Abhandl. geol. spec. Kart. Preuss., Bd. ii, Heft 4, 1878).Google Scholar

page 173 note 4 Hall & Clarke: op. cit., p. xxxi.

page 173 note 5 Oehlert, : Bull. Soc. Géol. France, sér. III, vol. xvii (1889), p. 758.Google Scholar

page 176 note 1 Hoernes, , Jahrb. Geol. Reichsanst. Wien, Bd. xxx, Heft 4 (1880), pp. 651–686; and id.,Google Scholar Kosmos, , Jahrg. iv, Bd. viii (1880), pp. 20–32.Google Scholar

page 177 note 1 Reed, : Geol. Mag., Dec. V, Vol. I (1904), p. 383, Pl. XII, Fig. 2.CrossRefGoogle Scholar

page 177 note 2 Ibid., p. 106, Pl. V.

page 178 note 1 Oehlert, : Bull. Soc. Géol. France, ser. m, vol. xxiv (1896), p. 843, woodcut fig. 12.Google Scholar

page 178 note 2 Id.: op. cit., sér. III, vol. xvii (1889), p. 758.

page 178 note 3 Ibid., p. 763, pl. xviii, fig. 6.