^{page 298 note 1} Fanne du Calcaire Carboniftre de la Belgique (Annales du Mus. Eoy. d'Hist.nat. de Belgique, vol. ii.), part i. 1878, p. 115, pl. xxiv. ff. 2a, b.

^{page 299 note 1} I propose this name as a sort of colloquial word, congruous with Ammonites, Ceratites, Goniatites, etc., to distinguish those genera which are certainly not true Ammonites, either in characters or hy descent, namely, Lytoceras, Pleuracanthites, Phylloceras, Monophyllites, etc. They are characterized by the phylliform cells of the septa, and probably by the absence of any calcareous Aptychus or Anaptychus. Lytoceratites are biologically lower than Ammonites, though they are collateral and coeval. They were separated by Hyatt (Genesis Arietidæ, p. 4) as Lytoceratinœ; but this places Lytoceratinœ superior to Lytoceratidœ, whereas it should be of inferior rank. The terms Lytocerataceœ and Ammonacece (the latter used many years ago) might indicate Lytoceratites and Ammonites respectively, and be subdivisions of Ammonoidea.

^{page 299 note 2} “Genetic Relations of Stephanoceras,” Proc. Boston Nat. Hist. Soc. vol. 18, p. 386, 1876.Google Scholar

^{page 299 note 3} Hyatt, , op. cit. p. 368 (E. B. Tawney's information).Google Scholar