560 Scientific Proceedings, Roijal Dublin Society. 



TLe figures are from sections of a new specimen from the same beds as 

 the one figured by Vaughan. The following points, not appearing in the 

 latter figure, may be noted : — The central plate may form a prominent cusp 

 on the central area, opposite the fossula. Many of the minor septa are not 

 continuous to the outer wall. The tabulae in the central area are exceed- 

 ingly steep, as in the " nucleus" of 0. ingletonense Vau.' In the medial area 

 the tabulae are rather steep and vesicular, as in tlie "aureole" of C. ingle- 

 tonense. There is no region where the tabulae approach the horizontal 

 position, such as occurs in C. ingletonense and in C. dublinense {vide supra). 



CMsiophiilho,>,sY>. (PL XXXVl, fig. 10.) 

 Kate Rocks. 

 A fragment only found, much mineralized, from which a single transverse 

 section was obtained. 



The septate area is Cyathophylloid. The central area is divisible into 

 nucleus and aureole. The aureole contains about five or six tabular inter- 

 sections, and is radiated by about ten prominent lamellae. In the nucleus 

 tlie lamellae are more numerous, but it is too mineralized to make out the 

 structure any further. 



Clisiophyllid, sp. nov. (Pi. XXXVI, fig. 11.) 

 Rush Conglomerate, 11 11 b. 

 Two fragmentary specimens only were found. In a transverse section 

 the most remarkable features are the highly developed central area, and the 

 entire absence of an external vesicular zone. In these respects it bears some 

 resemblance to "a new genus of Clisiopliyllid," described by Vaughan." 

 The present form, however, differs from this in the following points : — 

 Smaller size (diam. 'II mm.); fewer septa (c. 30 major); fewer (c. 10) 

 tabular intersections in the central area, which is not so distinctly bounded; 

 the presence of a thin mesial plate included in tlie central area ; the more 

 tent-like shape of the tabulae. The septa are blunt-ended, and do not reach 

 the central area. The minor septa are nearly half as long as tlie major. 

 The central area projects in the calyx as a fairly high dome, on which tlie 

 lamellae run spirally. 



Clisiophyllid, sp. nov. (Pi. XXXVI, fig. 2.) 



HOLMPATKICK LiMESTONE. 



One imperfect specimen, embedded in matrix. Diameter of calyx 24 mm. 

 Lengtli about 30 mm. Exterior costate. 



' Loc. supra cit. 



2 Quart, Journ. Geol. Soc, vol. Ixiv, 1908, p. 464, 



