184 E. F. TOMES ON THE GREAT-OOLITE MADREPORARIA. 



The calices are well defined by prominent intercalicnlar costae, 

 which are thick, short, regular, and closely placed. 



The calices themselves are nearly circular, but become more or 

 less oblong and irregular in form before fissiparity takes place. 

 The septa are rather thin, but fully maintain their size as they 

 approach the centre of the visceral cavity. 



There are six systems and three complete cycles. The first cycle 

 joins into the columella ; those of the second are two thirds the 

 length of the first ; and those of the third are ouly a little shorter 

 than the second, towards which they curve. 



Height of the corallum six lines, diameter of the calices from one 

 to two lines. 



The only specimen I have met with came from the Stonesfield 

 Slate of Sevenhampton, and is now in my collection. As fissiparity 

 is only observable in one calice, and the growth therefore presumably 

 slow, there is nothing to support the supposition that, as the small 

 size would seem to indicate, it is a 3 7 oung individual. 



Genus CWeusastr^a, M.-Edw. and Haime. 



Confttsastr^a BURGUNDiiE, M.-Edw. and Haime, Pol. Eoss. des terr. 

 Pal. p. 98 (1851). 



Astrcea burgundies, Mich. Icon, p. 106, pi. 24. fig. 4, 1843. 



A specimen in my own cabinet which agrees with the figure 

 given by' Michelin of C. burgundice, excepting that the septa are 

 somewhat stouter, was purchased of a dealer with other Great Oolite 

 corals, and was said to have been received from Cirencester. I am 

 unable to give further information respecting it, except to add that 

 it has very much the appearance of a Eairford coral. 



Conftjsastr.ea magnieica, n. sp. Plate YII. figs. 15 & 22. 



One specimen only of this new and flue species was obtained at 

 Fairford ; and I describe it as follows : — 



The corallum is globular, and has a short and thick pedestal. 

 Nearly the whole of the globular part is calicular. 



The calices are round or oval, and deep ; and the septa are exsert 

 outwardly, where they form a circular prominence. The space 

 between the calices is fiat and depressed. 



The septa are rather thin, and of nearly equal thickness throughout, 

 and have their margins regularly denticulated, each prominence 

 being the termination of a rib, which is vertically placed on the sides 

 of the septa (fig. 22). 



The fossula is scarcely observable, but is a little elongated ; and 

 the septa meet, but do not unite, in the centre of the visceral cavity. 



The septal costae are continuous with the septa, and are of the 

 same thickness, and connect the septa of one calice with those of 

 another. Their margins are furnished with small tubercular denta- 

 tions like those of the septa. 



The first and second cycles of septa are of equal length, and meet 



