34 BRITISH FOSSIL CORALS. 
Family EUPSAMMID A (p. li). 
1. Genus StmPHANOPHYLLIA (p. lil). 
STEPHANOPHYLLIA DiscoipEs. ‘Tab. VI, figs. 3, 3a, 34. 
STEPHANOPHYLLIA DiscorpES, Milne Edwards and J. Haime, Aun. des Sc. Nat., 3™ série, 
vol. x, p. 93, 1848. 
Corallum simple, extremely short, and discoidal ; its under surface almost horizontal, 
somewhat promiment in the middle, and showing no trace of adhesion. Coste very narrow, 
radiate, alternating with the septa, corresponding to these in number, and nearly equal in 
breadth, but differmg much in length, according to the cycla to which they belong ; the 
smaller ones often united to the larger ones at their basis, and thus giving to the latter a 
dichotomous appearance (fig. 34). All these costal striae are composed of a single row of 
rather indistinct granule, and are united by small intercostal trabiculee, thus constituting 
the tissue of the discoidal wall, and the radiate rows of pores that exist in this part of the 
corallum, and give to it the appearance of a microscopical sieve. 'The upper or calicular 
surface somewhat convex, and presenting in the centre a small, narrow fossula, at the 
bottom of which there appears to be a rudimentary papillose columella. Septa forming five 
cycla, of very unequal size, thin, very slightly granulated, not projecting laterally beyond the 
edge of the wall, and having the upper edge rather angular. Those of the first and second 
order large, straight, and free at their inner end; all the others bent towards one another, 
and cemented along their inner edge, so as to constitute a series of slightly undulated 
arches, superposed and increasing in size from the circumference of the calice towards the 
centre ; the largest are formed by the septa of the fourth cyclum, which unite two by two, 
along the inner edge of the tertiary ones (which are very short), and thus constitute on 
each side of the secondary septa a single lamina, that advances still further towards the 
centre of the calice, and joms the neighbouring secondary septum opposite the point of 
junction of its homologue, so as to give to the central portion of the calice the appearance 
of a six-branched cross of Malta; the septa of the fifth cyclum very small and marginal. 
Diameter, two lines or two lines and a half; height, about half a line. 
This fossil Coral differs from Stephanophyllia Suecica’ and S. Bowerbankii (Vab. IX, fig. 4), 
by the form of the septa, which in the latter two species are terminated by an arched edge, 
and are spinulose laterally ; it is distinguished from Sfephanophyllia astreata’ by the distance 
that separates the large septa near the columella, and from S. elegans,3 8. imperialis,' and 
' See our Monograph of Eupsammide, Ann. des Se. Nat., 3" série, vol. x, p: 94. 
2 Fungia astreata, Goldfuss, Petref. Germ., vol. i, tab. xiv, fig. 1. 
* Ann. des Se. Nat., 3"° série, vol. x, tab. i, figs. 10, 10a. 
* Michelin, Icon. Zooph., tab. viii, fig. 1. 
