﻿vol. 6 i.] sequence in the bristol aeea. 267 



(1) Notes on the Corals. 

 Introductory Explanation. 



For the determination of the corals, horizontal sections are 

 indispensable, but the nature of the vertical section can usually be 

 deduced from an examination of the horizontal section. 



Calicular views are of far less value, because they are rarely met 

 with in the field, and, when seen, are as a rule partly obscured by 

 matrix, or destroyed by weathering ; they also give a misleading 

 idea of the internal structure, both by exaggerating the relative 

 importance of the secondary series of septa and by disguising that 

 of the tabulae. The horizontal sections figured in Pis. XXII- 

 XXIY are photographed from thin slices by Mr. J. W. Tutcher, 

 by a process which he has himself invented. 



The full titles of the works, referred to in these notes, are as 

 follows : — 



Michelin, H. : ' Iconographie Zoophytologique.' 1840-1847. 



M'Coy, E. : ' Synopsis of the Characters of the Carboniferous-Limestone 



Fossils of Ireland.' Dublin, 1844. Folio. 

 M'Coy, F. : ' Systematic Description of the British Paheozoic Fossils in 



the Greological Museum of the University of Cambridge.' 1851. 

 Milne-Edwards, A., & Haime, Jules : * Monographie des Poly piers fossiles 



des Terrains Palgeozoiques ' [ex Arch. Mus. Hist. Nat. vol. v]. 1851. 

 Milne-Edwards, A., & Haime, Jules : ' Monograph of the British Fossil 



Corals ' pt. iii (1852) pp. 150 et seqq. Palaeontographical Society. 

 Thomson, James : ' On the Development & Generic Relation of the 



Corals of the Carboniferous System of Scotland ' Proc. Phil. Soc. 



Glasgow, vol. xiv (1883) p. 296 ; and earlier papers of the same 



author, in the same Proceedings. 

 Vaughan, Arthur : ' Notes on the Corals & Brachiopods obtained from 



the Avon Section & preserved in the Stoddart Collection' Proc. 



Bristol Nat. Soc. n. s. vol. x (1903) p. 90. 



See also the general introductory remarks on p. 266. 



Alveolites. 



Alveolites septosa (Flem.). 

 Here I include : — 



A. septosa, Edwards & Haime, ' Monogr. Brit. Foss. Cor.' p. 157 & pi. xlv, 



figs. 5-5 6. 

 A. depressa, Edwards & Haime, ibid, p. 158 & pi. xlv, figs. 4-4 a. 



The relation of these forms is discussed in Proc. Bristol Nat. 

 Soc. n. s. vol. x (1903) p. 95. 



Syringopora. 



It is very doubtful whether the so-termed ' species ' of this genus 

 are anything more than circuli. 



Sykingopora cf. distans, Eischer. 



As interpreted in Edwards & Haime, ' Polypiers Foss. Paleoz.' p. 286 & 

 pi. xx, fig. 1. See also Proc. Bristol Nat. Soc. n. s. vol. x (1903) p. 98. 



