FEOM THE GREAT OOLITE. 185 



Down, and the existence of the genus Goniocora there establishes 

 its distribution through nearly the whole of the English Oolites. 

 It has now been met with near to the bottom of the Inferior Oolite 

 at Crickley, in the Great Oolite of Parley Down, and in the Coral 

 Bag at Steeple Ashton and other places. 



DiMOEPHASTRJEA EuiTGiFOiiMis, H. sp. (Plate Y. figs. 22, 23.) 



I have obtained from the coral-bed of Combe Down several corals 

 of a species which, as I fail to detect pores in the septa, is here 

 placed in the genus DimorpTiastrcea. It has a pedunculate form 

 with an overhanging rounded fungiform top, the upper surface of 

 which is convex. The peduncular part is short, and the expanded 

 top has a thin and slightly lobed outer edge. 



The peduncle has regular and straight costse, which are similar in 

 size to the septal costse near the outer part of the corallum, but 

 smaller than those around the central calice. 



The central calice is large and prominent, but is centrally 

 depressed, somewhat like the calicos of Crateroseris and Adelastrcea. 

 The smaller calices are about twelve in number, and are arranged 

 somewhat symmetrically around the larger one, and, like it, are 

 prominent, with a depressed centre. About one hundred septa 

 enter into the composition of the central calice, and about half the 

 number are observed in the smaller ones. In all the calices the 

 septa anastomose very near to the fossula, but not anywhere else; 

 and none of the septal costse anastomose, excepting quite at the 

 outer margin of the coraUum, and then only sparingly. The septa 

 are rather stout, regular, parallel ; and the loculi have the same 

 breadth as the septa themselves. The edges of the septa and the 

 septal costse have regular and rounded tubercles, much as in Cra- 

 teroseris. 



Height of the corallum about 1 inch. 



Diameter of the corallum about 1 inch 4 lines. 



The present species bears some resemblance to DimorphastrcBci 

 helianthus, Becker, from the Corallian of Nattheim, in so far as 

 the stoutness of the septa and septal costas is concerned, but differs 

 wholly from that species in general form, in the shape and arrange- 

 ment of the calices, and in the absence of anastomosing septal 

 costse. 



At present I am unable to state whether the septa are perforate 

 or not, nor can I speak of the synapticulse, excepting to say that 

 they are present. 



Genus Comoseris, d'Orb. 



In his recently published " Revision of the Families and Genera of 

 Sclerodermic Zoantharia," Prof. Duncan takes exception to my state- 

 ment that no very near relationship exists between Comoseris and 

 Oroseris ; and after stating that there is no wall either surrounding 

 the calices or in the collines of the former genus, ho asserts that I 

 have "■ misunderstood the diagnoses of the genera, for it must 

 appear, on reading them, that Oroseris can hardly stand as a genus 



