II.—The Facial Suture of Trilobites

H. H. Swinnerton

doi:10.1017/S0016756800202252

II.—The Facial Suture of Trilobites

Published online by Cambridge University Press: 01 May 2009

H. H. Swinnerton

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H. H. Swinnerton: Affiliation:
University College, Nottingham.

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Trilobites in common with all other Arthropods shed their more or less rigid external covering or exoskeleton periodically. To accomplish this ecdysis it is necessary for this covering to split somewhere; and it is highly probable that the facial suture was the line along which such splitting took place. There seems, however, to be a tendency to assume that all lines which served this purpose are homologous. This has introduced unnecessary difficulties into the study of Trilobite classification. The object of this paper is to do something towards the elimination of this source of error.

Type: Original Articles
Information: Geological Magazine , Volume 6 , Issue 3 , March 1919 , pp. 103 - 110

DOI: https://doi.org/10.1017/S0016756800202252 [Opens in a new window]
Copyright: Copyright © Cambridge University Press 1919

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References

^{page 103 note 1} Bothriolepis cristata, Traquair, R. H., Fishes of the Old Red Sandstone (Mon. Pal. Soc., 1906), p. 130, pl. xxxiGoogle Scholar.

^{page 103 note 2} See Traquair, R. H. in Brown, & Buckley, 's Vertebrate Fauna of Moray Basin, 1896, p. 257Google Scholar.

^{page 103 note 3} Bernard, H. M., “The Systematic Position of Trilobites”: Q.J.G.S., vol. 1, p. 414, 1894Google Scholar.

^{page 104 note 1} Bull. U.S. Geol. Surv., No. 30, p. 154, 1886Google Scholar.

^{page 105 note 1} Walcott, C. D., “Middle Cambrian Brachiopoda, etc.”: Smithsonian Misc. Coll., vol. lvii, pp. 192, 193, 1912Google Scholar.

^{page 105 note 2} Walcott, C. D., “Olenellus, etc.”: Smiths. Misc. Coll., vol. liii, p. 277, pl. xli, fig. 9, 1910Google Scholar.

^{page 105 note 3} 1894, p. 420Google Scholar.

^{page 105 note 4} Vide Cole, F. J. & Johnstone, J., L.M.B.C., Memoirs, No. viii: Pleuronectes, pp. 174 et seq., 1901Google Scholar.

^{page 106 note 1} 1894, pl. 420.

^{page 106 note 2} Walcott, C. D., Tenth Ann. Rep. U.S. Geol. Surv., 1891, p. 638Google Scholar.

^{page 106 note 3} 1910, pl. xxxiv, fig. 6.

^{page 106 note 4} Raymond, P. E., Amer. Journ. Sci., vol. xliii, p. 208, 1917Google Scholar.

^{page 106 note 5} Amer. Journ. Sci., 1897, p. 183Google Scholar.

^{page 106 note 6} Ibid., 1917, p. 198.

^{page 107 note 1} Ibid., p. 208.

^{page 107 note 2} Walcott, C. D., Smiths. Misc. Coll., vol. lxiv, No. 5, p. 407, 1916Google Scholar.

^{page 107 note 3} Smiths. Misc. Coll., vol. lvii, p. 195, 1912Google Scholar.

^{page 107 note 4} Geol. Mag., 1916, p. 175Google Scholar.

^{page 107 note 5} 1917, pp. 201 et seq.

^{page 107 note 6} p. 203.

^{page 108 note 1} p. 203.

^{page 108 note 2} Amer. Journ. Sci., 1897, p. 184Google Scholar.

^{page 108 note 3} Walcott, C. D., Smiths. Misc. Coll., vol. liii, p. 256Google Scholar.

^{page 108 note 4} Ibid., vol. lvii, p. 194.

^{page 109 note 1} Dollo, L., La Paléontologie ethnologique, Bruxelles, 1910, pp. 406 et seqGoogle Scholar.

^{page 109 note 2} p. 204.

^{page 109 note 3} Geol. Mag., 1915, p. 492Google Scholar.

^{page 109 note 4} Amer. Journ. Sci., 1917, p. 208Google Scholar.

^{page 109 note 5} Ibid.

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II.—The Facial Suture of Trilobites

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