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V.—Sedgwick Museum Notes. Notes on the genus Trinucleus. Part IV

Published online by Cambridge University Press:  01 May 2009

F. R. Cowper Reed
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Extract

The triangular non-perforated areas lying on each side of the glabella and bounded in front and laterally by the fringe are usually described as the cheeks and distinct from the fringe, as if they alone corresponded to the fixed cheeks of the Opisthoparia and Proparia, or even included also the free cheeks of these orders. But if the facial suture is marginal, and if the lower plate of the fringe is considered to represent the free-cheeks, as Beecher maintained, the upper plate of the fringe must be regarded as merely a modified marginal portion of the fixed cheeks, so that the triangular areas within the fringe would only constitute the inner part of the fixed cheeks.

Type
Original Articles
Information
Geological Magazine , Volume 3 , Issue 3 , March 1916 , pp. 118 - 123
Copyright
Copyright © Cambridge University Press 1916

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References

page 118 note 1 Beecher, , Amer. Journ. Sci., ser. iv, vol. iii, pp. 100, 103, 183, 186, 1897.Google Scholar

page 119 note 1 Salter, , Mem. Geol. Surv., vol. iii, 2nd ed., p. 516, 1881.Google Scholar

page 119 note 2 Lindström, , Kongl. Svensk. Vet. Akad. Handl., Bd. xxxiv, No. 8, pp. 18–20, 31–3.Google Scholar

page 120 note 1 Beecher, , Amer. Journ. Sci., ser. III, vol. xlix, pl. iii, figs. 1, 2, 1895.Google Scholar

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page 120 note 3 McCoy, , Syn. Brit. Pal. Foss. Woodw. Mus., p. 146.Google Scholar

page 120 note 4 Ibid., pl. i e, figs. 16, 16a.

page 120 note 5 Reed, , Geol. Mag., Dec. VI, Vol. I, Pl. XXVIII, Fig. 3, 1914.Google Scholar

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page 121 note 1 Reed, , Girvan Trilobites (Palæont. Soc.), pt. i, p. 25, pl. iv, fig. i, 1903.Google Scholar

page 121 note 2 Nicholson, & Etheridge, , Mon. Silur. Foss. Girvan, fasc. 2, p. 191, 1880.Google Scholar

page 121 note 3 Reed, , Girvan Trilobites, pt. i, p. 12, pl. ii, figs. 1–6, 1903.Google Scholar

page 121 note 4 Ruedemann, , Bull. 49 New York State Museum (1901), Palæont. Papers 2, p. 41, pl. iii, figs. 11, 15–20.Google Scholar

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page 123 note 1 Barrande, Syst. Silur. Bohême, vol. i, Trilob., p. 622;Google Scholaribid., Suppl., p. 47.