CARTOPHTLLIA CEA. 



TURBINOLIADA. 



THE SHETLAND CUP-CORAL. 



Paracyathus Thxdensis. 



(Sp. nov.) 



Plate X. Fig. 8. 



Specific Character. Plates in four imperfect cycles ; calice circular ; 

 height equal to half the diameter. 



GENERAL DESCRIPTION. 



Corallum. Slightly turbinate, adhering by a base, which, though broad, 

 is the narrowest part. Height about half the diameter. 



Bibs. Prominent on upper half, becoming ob- 

 solete below ; their edges set with tooth-like coni- 

 cal tubercles ; separated by intercostal furrowB, 

 which on the whole equal the ribs in width, but 

 both are irregular. 



Calice. Circular, shallow. 



Plates. Forming four cycles and six systems ; 

 those of the fourth cycle wanting in the halves of 

 four systems, and present in both halves of the 

 other two. Rather wide apart, moderately salient, 

 rather thick, scarcely thickened externally ; out- 

 line of their upper edge forming a flattened arch, 

 but not uniformly, in some the highest point being at the margin, in others 

 far within ; inner edge nearly perpendicular : entire edge set with irregular 

 eminences and blunt points : both surfaces studded with coarse granules. 



Columella. A single flexuous plate with a somewhat tri-radiate summit, 

 united below to the palules. 



Palules. Indistinct, being confluent, and sending off horizontal traverses 

 to the septa, so as to form an irregular perforated horizontal lamina, 

 whence the columella rises. 



P. THULEN'SIS 



(magnified). 

 Vertical aspect 

 corallum. 



«f 



Size. 



Diameter - 19 inch ; height *1. 

 Animal. Unknown. 



