MESOZOIC RADIATA. 47 



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- 

 stantly from specimens I have examined of the Astraa seocradiata 

 (Gold.) which agree with his figure in having them half their 

 diameter apart, without perceptible variation, while from the 

 A. tumularis (Michel.) it differs in its smaller and less promi- 

 nent cells as well as form of the mass. 



Not uncommon in the inferior oolites of Dundry. 



{Col. University of Cambridge.) 



Astrcea (Lamk.). 



From the unfavourable mode of petrifaction of the oolitic 

 Astrcece, I am unable to seize their subgeneric characters with the 

 precision I could wish — their specific characters are easy enough 

 — I have therefore provisionally been obliged to leave them all 

 under the old genus Astrcea for the present, being unable satis- 

 factorily to define their differences from the recent group. 



Ast7'csa tenuistriata (M^Coy). 



Sp. Char. Corallum forming irregular flattened masses, of shal- 

 low polygonal cells, very unequal in size and shape (most 



