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III.—Blind Trilobites

Published online by Cambridge University Press:  01 May 2009

F. R. Cowper Reed
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Extract

The occurrence of certain genera and species of trilobites which are destitute of eyes has long been known, and so much importance was attached by Dalman to the presence or absence of the visual organs that he instituted two principal divisions of the trilobites based simply on these characters. Goldfuss followed the same lines in his system of classification, though he took into consideration also the structure of the eyes; and Emmrich likewise regarded the possession or lack of these organs to be of taxonomic value. Although in modern schemes of classification more stress is laid on other features of the organization, yet with our increasing knowledge of the ontogeny of various species of trilobites it is perceived that the presence, position, and nature of the eyes are points which must by no means be overlooked.

Type
Original Articles
Information
Geological Magazine , Volume 5 , Issue 10 , October 1898 , pp. 439 - 447
Copyright
Copyright © Cambridge University Press 1898

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References

page 442 note 1 Amer, . Geol., vol. xvi (1895), p. 166.Google Scholar

page 442 note 2 Beecher, , Amer. Journ. Sci., vol. iii (1897), pp. 89 and 181.CrossRefGoogle Scholar

page 443 note 1 Beecher, , Amer. Journ. Sci., vol. iii (1897), p. 183.Google Scholar

page 444 note 1 Trans. Roy. Soc. Canada, vol. v (1887), p. 160.Google Scholar

page 444 note 2 Whidborne, , Monogr. Devon. Fauna, vol. i, p. 32: Palaeont. Soc, 1879.Google Scholar

page 445 note 1 Matthew, , Trans. Roy. Soc. Canada, vol. ii, sect. iv.Google Scholar

page 445 note 2 Barrande, , Syst. Sil. Boh., Suppl., vol. i, p. 4.Google Scholar

page 446 note 1 Amer, . Nat. (1880), p. 503.Google Scholar

page 446 note 2 Journ, . Morph., vol. ii (1888), p. 253.Google Scholar

page 446 note 3 Ann, . Mag. Nat. Hist., vol. iv (1849), p. 410;Google Scholar and Brit, . Pal. Foss., 1851, p. 146.Google Scholar

page 446 note 4 Barrande, , Syst. Sil. Boh., vol. i, pp. 617, 620.Google Scholar Nicholson, and Etheridge, , Mon. Silur. Foss. Girvan, fasc. 2 (1879), pp. 188–197.Google Scholar Beecher, Amer. Journ. Sci., vol. xlix (1895), p. 307.Google Scholar

page 447 note 4 Œhlert, D. P., Bull. Soc. Géol. France, vol. xxiii (1895), p. 319Google Scholar.

page 447 note 4 Mem. Geol. Surv., dec. xi, No. 6 (1864), p. 1Google Scholar.

page 447 note 4 Nicholson, and Etheridge, , Mon. Sil. Foss. Girvan, fasc. 2, p. 199Google Scholar.

page 447 note 4 Geol. Canada: Pal. Foss. (1865), vol. i, pp. 33 and 281Google Scholar.