﻿Vol. 6 1.] SEQUENCE IN THE BKISTOL AREA. 269 



Michelinia. 



The reference of specimens to particular species can only be 

 approximate, since the characters of the base are seldom seen. 

 I have consequently, in most cases, contented myself with recording 

 the genus. 



Michelinia cf. eavosa (Goldf.). 



As interpreted in Edwards & Haime, ' Monogr. Brit. Foss. Cor.' pt. iii, 

 p. 154 & pi. xliv, figs. 2 b-2 c. 



Here may be placed the specimens from Z L . 



Michelinia cf. tentjisepta (Phill.). 



As interpreted in Edwards & Haime, ' Monogr. Brit. Foss. Cor.' pt. iii, 

 p. 155 & pi. xliv, figs. 1-1 b. 



Here I include tall forms, composed of few corallites, with thin 

 walls. I have only seen a few specimens from Z 2 . 



Michelinia megastoma (Phill.). 



As interpreted in Edwards & Haime, ' Monogr. Brit. Foss. Cor.' pt. iii, 

 p. 156 & pi. xliv, figs. 3-3 b. 



Here I include forms with thick walls and large corallites. 

 This is probably the commonest species ; it characterizes the top 

 of Z and the lower part of C. 



Amplexus. 



Amplexus cf. coealloides, Sow. 



As interpreted in Edwards & Haime, ' Monogr. Brit. Foss. Cor.' pt. iii, 

 p. 173 & pi. xxxvi, figs. 1-1 e. 



I include here all the large cylindrical forms of the genus. 



Zaphrentis (restricted). 

 = Zaphrentis as employed by Edwards & Haime, with the omission of tha 

 group of Z. cylindrica, which is here referred to Caninia. 



Zapheentis aff. Phillipst, Edwards & Haime. (PL XXII, figs. 2- 

 2 e & text-fig. 2, p. 270.) 



Includes : — 



f Zaphrentis Phillipsi, Edwards & Haime, ' Monogr. Brit. Foss. Cor.' pt. iii, 

 i p. 168 & pi. xxxiv, figs. 2-2 b. 



[ Zaphrentis Griffithi, Edwards & Haime, ibid. p. 169 & pi. xxxiv, figs. 3-3 a. 

 Prox. Zaphrentis Phillipsi, Edwards & Haime, ' Polypiers Foss. Paleoz.' 



p. 332 & pi. v, fig. 1. 

 Non Zaphrentis Phillipsi, Thomson, Proc. Phil. Soc. Glasgow, vol. xiii 

 (1881-82) p. 222 & pi. iv, figs. 3-3 a, 



Corallum small, conical, and usually curved. The length seldom 

 reaches 8 centimetres, average specimens being under 2 cm. long. 

 Epitheca thick, with strong rugae. Calyx very deep, with a thin 

 margin. 



Primary septa strongly thickened at the wall and also at their 

 inner ends, where they are attached to the tabulae. 



