560 K. F. TOMES ON MADEEPOEAEIA FE01E THE COEAL EAG 



difficult to recognize such specimens as generically identical with 

 those which have no columella. 



Ceateeoseeis, n. g. 



The corallum is composite, massive, and has a depressed turbinate 

 form, and the calicular surface is superior and convex. 



There is a common wall, which is naked and costulated. The 

 calices are evenly distributed, round and prominent, but depressed 

 in the middle, and they have a small well-defined fossula. The 

 intercalicular spaces are depressed. 



The septa are imperforate, their margins are moniliform, and 

 they are continuous with the septal costEe, which pass from one 

 calice to another without interruption. 



Both septa and septal costse are connected by well-developed 

 synapticulse. 



The method of increase is by gemmation, which takes place in 

 the depressed intervals between the calices at the outer margin of 

 the corallum. 



There is very little difference in the form of the calices of this 

 genus and. those of Confusastrcea, to which genus it might be 

 referred, were it not for the wide difference in its internal structure. 



Ceateeoseeis fttngifoemis, n. s. Plate XXII. figs. 11-14. 



The corallum is flatly turbinate, slightly peduncular, and attached- 

 by a small surface. The mural costee are uniform in size, small, and 

 may be traced without interruption from the peduncular region to 

 the calicular margin, over which they pass, and are continuous 

 with the septa of the outer calices. They are rather delicately but 

 obscurely papillated. There is no epitheca. 



The calicular surface is more or less convex, and the calices are 

 evenly distributed. They are round, well defined, and prominent, 

 with their middle part depressed and open, and there is a small, 

 round, and well-defined fossula. The intercalicular spaces are 

 depressed. 



The septa and the septal costse are regular, uniform in size 

 throughout, rather thick, very closely placed, and many of them 

 anastomose. All their margins are ornamented with thickly placed 

 tubercles, which are a little flattened, and have their greatest 

 diameter across the septa. There are from thirty-five to forty- 

 three septa, of which from seventeen to twenty reach the fossula ; all 

 the others are irregular in length, and many of them run into the 

 larger ones. The cycles are not traceable. 



The synapticulae are well developed and abundant, but they are 

 rather small. 



Diameter of the calices from two to three lines; distance from centre 

 to centre of the calices from three to five lines. Height of the coral- 

 lum two inches, and its greatest diameter three inches and six lines. 



Two examples of this coral have come under my observation, 

 both of which were obtained from Steeple Ashton. One of these is 

 in Dr. Wright's collection, and the other is in my own. 



