﻿Vol. 64.] IN THE CAEBONIFEROUS ROCKS AT LOUGHSHINIilY. 463 



II. Corals in which the axial mass is bisected by a long coluraellar 

 plate, and forms a densely-reticulate oval nucleus within the 

 broadly-reticulate central area. 



(«) The Clisiophyllid characteristic of the basal beds of Ingleton 

 (S^ ; see Cosmo Johns, Geol. Mag. dec. 5, vol. iii, 1906, p. 322) 

 has a broadly and regularly-reticulated central area enclosing a 

 very finely -reticulated oval nucleus, which is bisected by the thick 

 columellar plate. The septa are stout, well spaced, aud continuous 

 to the wall. Minor septa are regularly developed after the 

 LitJiostrotion-plsiia, and are only slightly less prominent. 



(b) The Cyathophylloid Clisiophyllids from S^ of the Frome 

 district (Mendips) figured by Dr. T. F. Sibly ^ exhibit a strongly- 

 differentiated axial nucleus, but the septation is markedly Cyatho- 

 phylloid. 



(c) The Clisiophyllid from the Carlyan Eocks (PI. XLIX, fig. 1) 

 has an axial nucleus almost identical with that of Dr. Sibly's 

 fig. 5 b, while the septation agrees with that of the Ingleton 

 species. Hence the afiinities of the Carlyan coral are strongly with 

 forms from CS^. A species from D^.g of Thorpe Cloud (Derby- 

 shire) has a similar axial mass, but the septal plan is as highly 

 developed as in the D., Koninclcopliylla. 



Dibunophyllum. 



DiBUNOPHrLLUM aff. MuiRHEiDi, Thoms. & Nich. (PI. XLIX, 

 figs. 4a&46.) 



Compare Thorns. & Nich. op. cit. vol. xvii (1876) p. 459 & pi. xxv, fig. 4. 



This species belongs to the same section as Dibunophyllum 6, 

 Vaughan, but is more highly developed. Simple forms inter- 

 mediate between it and Dibunophyllum B are commonly associated 

 with the latter in D^ of the Ingleton area," and highly-developed 

 variants characterize D,, of the same province ^ ; it is common in 

 the Lower Limestone of Fife."* 



Fig. 4 b diff'ers in the markedly-differentiated external ring and 

 in the firmly-drawn characters of the central area ; in the first- 

 mentioned peculiarity this species shows convergence with Clisio- 

 phyllum curJceenense. 



Both species are common in the Dibunophyllum-lAmestone 

 (Lower D,,). 



1 Quart, Journ. Geol. Soc. vol. Ixii (1906) pi. xxxi, figs. 5 a & 6 b. 



2 From material collected by Mr. Cosmo Johns. 



^ From material collected by Prof. E. J. Garwood. 

 ■* From material collected by Dr. C. A. Matley. 



Q. J. G. S. No. 255, 2 h 



