﻿70 ME. T. F. SIBLT 0^^ THE FAUNAL SFGCESSIOJS^ IN THE [Feb. IQoSy 



Section Beaumontia. 

 Beaumontia afF. Egeetoni, Edwards & Haime. ""^ 



A coral which occurs in D3, and is locally abundant, agrees 

 preciselj^ with Beaumontia Ecjertoni. as described and figured in 

 ' Monogr. Brit. Foss. Corals ' (Palteont. Soc.) pt. iii (1852) p. 160 

 & pi. xlv, fig. 1. This form is a typical representative of the 

 Beaumontia-^QQtion (genus Michelinia). The corallum forms a 

 large, elongate mass, and the corallites are narrow and elongated. 

 The tabulae, which are either flat, or very slightly convex or concave, 

 nearly all stretch completely across a corallite. 



Cyathophyllum. 



CrATHOPHrLLUM REGIUM, Phil. 



See A. Vaughan, Proc. Bristol Nat. Soc. ser. 0, vol. x (1903) pp. 114-15, & 

 Quart. Journ. Geol, Soc. vol. Ixi (1905) pp. 275-76. 



This species is widely distributed, and often abundant, in D^ ; it 

 persists into D3, but is there extremely rare. 



Specimens from Derbyshire have been figured by M'Coy, ' Brit. 

 Pal. Foss.' 1855, pi. iii a, figs. 7, 7 a, & ]A. iiiB, fig. 1 (Astrcea 

 carbonaria). All the Midland specimens which I include in 

 Gyatliophyllum regium are compound forms. 



Specimens of CyatliopJiyllum regium from the Midland area 

 exhibit considerable individual variation in the structure of the 

 central area, as seen in vertical section. The replacement of 

 tabulae by a vaulted arrangement of fine vesicles is never so com- 

 plete as in specimens from the South-Western Province. In the 

 majority of Midland specimens, the .narrow central space shows 

 a regular development of very closely-packed, flat, subvesicular 

 tabulae ; but in some specimens this structure is partly replaced by 

 a vaulted arrangement of vesicles. Certain specimens possess an 

 unusually-strong development of flattened tabulae. These forms, 

 however, agree with the typical vesicular form of Cyathophyllum 

 regium in all other characters, and cannot be regarded as anything 

 but a local variety ; they do not occur in association with the more 

 typical vesicular forms. 



Koninckophyllum. 



KONINCKOPHYLLUM PEOPEIUM, sp. nOV. (PI. I, fig. 3.) 



Habit of growth: simple. Form: elongate-conical. 



The calyx shows a broad central area, occupied by the tabulae, 

 and only very partially radiated by the septa. The columella 

 projects as a small, central ridge. 



A horizontal section shows a stout, simple columella. The 

 columella is surrounded by one or more oval rings, produced by 

 the intersection of the plane of section with one or more of the 

 centrally- elevated tabulae. 



The primary septa are slightly thickened in the medial area. 



