Mr. F. M'Coy on some new Mesozoic Radiata. 399 



as on the upper surface ; the character is constant and strongly 

 marked. 



Common in the chalk of some parts of Yorkshire. 



(Col. University of Cambridge.) 



Manon foliaceum (M'Coy). 



Sp. Char. A large, flat, or slightly concave, thin foliaceous ex- 

 pansion (averaging 7 or 8 inches in diameter and quarter of an 

 inch thick) of a very dense, minutely porous structure ; margin 

 rounded ; upper surface with numerous very prominent ostiolse, 

 averaging twice their diameter apart, rather less than a line in 

 diameter, perpendicular to the surface near the base, but be- 

 coming obliquely elongated towards the margin like adpressed 

 tubuli ; under surface marked with concentric waves of growth 

 without ostiolse. 



This singularly thin expanded species has no resemblance to 

 any other I am acquainted with. 

 From the coralline oolite of Malton. 

 (Col. University of Cambridge.) 



Zoophyta. 



(Zoantharia.) 



Dentipora glomerata (M'Coy) . 



Sp. Char. Corallum forming irregular globose masses 2 or 3 

 inches in diameter, of a very dense granular structure, in 

 which are distributed the circular cells, 1 line in diameter, and 

 their own diameter apart ; the stars have a small depressed 

 centre, from which ten thick, equal lamellae radiate to the cir- 

 cumference, where between each pair a minute rudimentary 

 marginal lamella is usually seen. 



Common in the coralline oolite of Malton. 

 (Col. University of Cambridge.) 



Stylopora solida (M'Coy). 



Sp. Char. Corallum forming spheroidal masses about 1 inch in 

 diameter, on the surface of which circular cells open, 1 line in 

 diameter with slightly prominent margins ; a minute central 

 style or axis from which six strong equal lamellse radiate to 

 the walls, where in some specimens a minute rudimentary 

 marginal lamella may be seen between each pair; the cells 

 vary from once to twice their diameter apart, the intervening 

 substance very compact, with a minute obsolete superficial 

 granulation. 



The remoteness of the cells from each other separates this con- 



