10G 



by faint radiating costae, and are very faiutly raarkecl with fine 

 wavy transverse accretion-lines. 



The septa, which are very thiu, are in the unique specimen 

 336 in number. Forty-eight large ones of equal size divide the 

 calicle into 48 compartments each of which contains 7 smaller 

 septa of diminishing size. Of these 7 septa the largest one (fifth 

 cycle) does not descend quite to the level of the columella, the 

 two next largest (sixth cycle) do not descend quite half-way down 

 the calicular wall, and the four smallest (iu complete seventh cycle) 

 are very short. The surfaces of the septa are finely, sharply, and 

 somewhat sparsely granular, and their edges as they descend in the 

 calicle become sinuous, especially in the case of the larger septa. 

 The columella, which is deep-seated and narrow, is formed by 

 small trabeculse from the 48 large septa of the first four cycles. 



Greatest height of corallum 39 millim. 



Maximum diameter of corallum 47 » 



This species is, evidently, nearly related to F. pavoninum, but 

 the corallum forms an arch of more than three quarters of a circle 

 and the septa are nearly twice as numerous. 



24. Flabellum dens n. sp. 



Corallum elougate, narrowly conical, strongly compressed, without 

 costae of any kind, buth with very faint transverse growth-rings. 

 The major axis of the calicular orifice, which is as 125 is to 50, 

 is on a very slightly lower plane than the minor. 



Calicular fossa very deep. Septa stout and strongly crimped; 

 those of the first three cycles are equal, and unite to forni the 

 columella, those of the fourth cycle are about half the depth of 

 those of the first three cycles, while those of the fifth cycle are 

 present in only a few half-systems ; consequently the usual arran- 

 gement of the septa is a large one alternatiug with a small one. 



Height of corallum 16 millim. 



Major diameter of calicle 12.5 » 



Minor » » » 5 » 





