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The majority of fossiliferous beds in the Cambrian are of anargillaceous nature, and limestones are comparatively rare, but weneed not here enter into a discussion as to the causes of their rarity.When, however, we come to the Ordovician, we find calcareous bedsmuch developed, and since we find in them, as well as in the slatesand shales, these blind genera, and as far as we know not lessabundantly, it appears as if the physical conditions of sedimentationhad but little to do with the existence and perpetuation of theseforms.
page 553 note 1 Erdgesohichte, vol. ii, p. 51Google Scholar.
page 554 note 1 Marshall, W., “Die Tiefsee und ihr Tierleben“ (Leipzig, 1888), p. 265.Google Scholar
page 555 note 1 Hinde, G. J.: Q.J.G.S., vol. li (1895), p. 609;CrossRefGoogle Scholar Trars Dev. Assoc., vol. xxviii (1896), p. 747;Google Scholar ibid., vol. xxix (1897), p. 518.
page 555 note 2 Suess, (“Antlitz der Erde,” vol. ii, p. 274), however, regards the oldest knownfauna of the Bohemian Silurian beds (i.e. E'tage C) to be an ‘adapted’ fauna, andtherefore the successor of a still older and unknown fauna. But he seems to arriveat this opinion by neglecting the testimony of phylogeny and ontogeny, and byregarding the absence of eyes in every case necessarily as an adaptive feature.Google Scholar
page 556 note 1 “Cave Fauna of North America”: Nat. Acad. Sci., vol. iv (1886), Mem. 1, pp. 116–137.Google Scholar
page 556 note 2 Ann. Mag. Nat. Hist., 1886, pp. 194–7.Google Scholar
page 557 note 1 Fauna of the Deep Sea “(Mod. Sci. Series), pp. 22–28.
page 557 note 2 bala Hickson, loc. cit.
page 557 note 3 Three Cruises of the “Blake,” vol. ii, p. 44. See also Marshall, W., “Die Tiefsee uod ihr Tierleben “(Leipzig, 1888), p. 260, etc.Google Scholar
page 557 note 4 Ibid., vol. i, p. 308.
page 558 note 1 Animal Life' (Internal Sci. Ser.), pp. 76–87 and 419–421.
page 558 note 2 Walther, Einleitung in die Geol., etc. (Jena, 1893–4), pp. 43, 44.
page 558 note 3 Sars, Chall. Rep., vol. xxxvii.
page 558 note 4 Die Tiefsee und ihr Tierleben, 1888, p. 265.
page 559 note 1 Hicks, , Pres. Add., Proc. Geol. Soc., 1897, vol. liii, p. 68.Google Scholar