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Published online by Cambridge University Press: 01 May 2009
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.”
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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
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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.