122 



The costse are alinost obscured by a thin ripple-marked epi- 

 theca on the side-wall , but are distinct enough on the base. 



The calicular orifice is ovate, one end being very much sharper 

 than the otber; its axial diameters are as 7:4, and the major 

 axis is on a slightly higher plane than the minor. 



The septa, which are thin, are arranged as if in eight systems 

 of three cycles, and the majority of them reach the columella: 

 their surface is sharply but very sparsely denticulate. 



The columella is a large oval reticulum of thin crisply-curled 

 processes and has a sunken appearance towards the centre. 



Height of corallum, between 2 and 3 millim.; major diameter 

 of mouth of calicle 7 millim., minor diameter 4 millim. 



Family EÜPSAMMIDiE. 



10. Stephanophyllia fungulus , n. sp. 



Corallum of coarsish texture, circular without any tracé of ad- 

 herence, the under surface nearly flat, the upper surface very 

 strongly convex. 



Costse of equal size, distinct from centre to edge of disk, bi- 

 furcating again and again until they become 96 in number. The 

 perforations between the costae form over 20 concentric rows. 



Septa strongly convex , with the free edge more or less crenate, 

 arranged in six regular systems of five complete cycles. Those of 

 the first cycle are independent, except that they are united with 

 the adjacent quiuaries by a few trabeculse. 



Perhaps the most conspicuous of all the septa are the two 

 quinaries which in each system lie next to the primaries: these 

 quinaries curve inwards, and finally unite with each other in front 

 of the secondaries, a paliform nodule often marking the point of 

 junction. The two outermost quiuaries of each system thus turn 

 the whole system into a delta from which all the other septa 

 (except, of course, the independent primaries which bound the 

 delta) appear to arise by a series of successive and very regular 

 bifurcations. 



