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II.—Suggestions for a Revised Classification of Trilobites

  • H. H. Swinnerton (a1)

Extract

Nevadia is the earliest and the most primitive member of theMesonacidæ, and as shown by Walcott may be regarded as representing the ancestral type of this family. The same authorityshows that the Paradoxidæ have descended from the Mesonacidæ. Redlichia also exhibits features which link it with the Paradoxidæ and the Mesonacidæ.

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page 538 note 1 Smiths. Misc. Coll., vol. liii, p. 249, 1910.

page 538 note 2 Walcott, , Proc. Wash. Acad. Sci., vol. vii, 1905; op. cit., 1910, p. 254.

page 538 note 3 Op. cit., 1897, p. 191.

page 538 note 4 Geol. Mag., 1902, p. 539.

page 538 note 5 Op. cit., 1910, p. 254.

page 538 note 6 Palæontologia Indica, ser. xv, vol. vii, p. 9, 1910.

page 539 note 1 Beecher, , op. cit., 1897, p. 191.

page 539 note 2 Cf. Dollo, , La Paléontologie Ethologique, Bruxelles, 1910, p. 415.

page 539 note 3 Ibid., p. 409.

page 539 note 4 Op. cit., 1897, p. 189.

page 539 note 5 Type species, Ptychoparia (Conocephalites) striata, Emmrich.

page 539 note 6 Matthew, G. F., Trans. Roy. Soc. Canada, vol. xi, p. 144, 1893.

page 540 note 1 Monogr. Palæont. Soc., 1907, p. 51.

page 541 note 1 Amer. Journ. Sci., vol. iii, p. 195, 1897.

page 541 note 2 Op. cit., 1904, p. 74.

page 541 note 3 Zittel, 's Textbook, 1913, p. 715.

page 541 note 4 Op. cit., 1913, p. 716.

page 541 note 5 Palœontologia Indica, 1910, p. 10.

page 541 note 6 Cambrian Fossils of Yellowstone Park, Monogr. 32, U.S.G.S., 1899, p. 460.

page 541 note 7 Op. cit., 1898.

page 542 note 1 Trans. Roy. Soc. Canada, ser. III, vol. v, p. 118, 1911.

page 543 note 1 Geol. Mag., 1902, p. 532.

page 543 note 2 Geol. Mag., 1912, p. 202.

page 543 note 3 Vide Reed, F. R. C., Monogr. Palæont. Soc., 1903, pl. iv.

page 543 note 4 It is conceivable that the absence of facial suture in Harpes is a case of retention of protoparian conditions.

page 544 note 1 Cf. Dollo, vide supra.

page 544 note 2 Op. cit., 1897, p. 197.

page 544 note 3 Op. cit., p. 196.

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