Smyth — Faunal Zones of Rush- Skerries Carhoniferous Section. 559 



by major and minor septa. A medial area radiated by major septa, forty- 

 two in number, and into which the minor septa project as teeth. The major 

 septa reach the central area. Tlie medial area contains two or three tabular 

 intersections. A central area containing about six tabular intersections, 

 radiated by about twelve lamellae, and bisected by a strong mesial plate. 



The only longitudinal section obtained was in the calyx. Tlie tabulae 

 are seen to form a very high, steep-sided boss, corresponding to the central 

 area of the horizontal section. 



The points characterizing the new genus are (1) the extreme steepness of 

 the tabulae in the central area, forming a high, sharp boss in the calyx ; 

 (2) the strong plate bisecting the central area ; (3) the simplicity of the 

 external area. 



This form is fairly common in the Rush Conglomerate and Carlyan 

 Limestone. The coral figured by Vaughan' from the Rush Conglomerate 

 probably belongs here. If so, it cannot be regarded as an early form of 

 ClisiojyhyUum ciirkeenense, in whicli the columellar plate is inconstant and 

 confined to the middle of the central area, and the tabulae are not steep. 



Clisiophyllum dublinense, sp. nov. (PI. XXXVII, fig. 2.) 

 Carlyan Limestone. 



This form appears to be related to CUsiophyllum ingletonense, Yau." It 

 differs from the latter chiefly in the central area. This contains far fewer 

 tabular intersections. A " nucleus " is present in which the lamellae are 

 numerous, and tabular intersections almost completely absent. The 

 " aureole " contains only fi.ye or six tabular intersections, and lamellae are few. 

 In a longitudinal section the tabulae appear steeply vaulted in the central 

 area, but the division into "nucleus" and "aureole" cannot be traced. 



The Cyathophylloid Clisiophyllid from Si of the Mendip area, figured by 

 Sibly,^ seems to have a considerable resemblance to this form. 



Clisiophyllum spissum, uom. nov. (PI. XXXVII, fig. 4.) 



Carlyan Limestone. 



Lithoslrotion -like Clisiophyllid, Vaughan. Quart. Joiirn. Geol. Soc, vol. Ixiv, 1908, p. 463, and 

 PL xlix, fig. 1. 



As a number of these " LitfiostroUon-YvkQ Clisiophyllids " are now known, 



it will be convenient to give this form a name. 



1 Quart. Jouvn. Geol. Soc, vol. Ixii, 1906, PI. xxx, fig. 2a. 

 - sProc. Yorkshire Geol. Soc, vol. xvii, Pt. iii, 1911, p. 251, and PI. xxxviii, fig. 1. 

 3 Quart. Journ. Geol. Soc, vol. Ixii, 1906, PI. xxxi, fig. 5a. 

 SOIENT. PKOO. E.D.S., VOL. XIV, NO. XLI. 4 D 



