CA R YOPHYLLIA CEA . TURBINOLIA DsE. 



THE SCARLET CRISP-CORAL. 



Ulocyathus arcticus. 



Specific diameter. Base triangular and flat, bounded by a sharp edge : 

 calice round. 



f'/ocyathus arcticus. Saes, Fauna Litt. Norv. ii. 73 ; pi. x. figs. 



18—27. 

 Flaoelliim MacAndrewi. J. E. Gray, Proc. Zool. Soc. May, 1849 : pi. ii. 



figs. 10, 11. 



GENERAL DESCRIPTION. 

 CORALLUM. 



Corallum. Simple, free, but with traces of having been adherent in 

 infancy : the base with a great inferior surface, triangular, flat, often 

 concave, separated from the superior surface, which is equally triangular 

 and convex, by a sharp edge on each side. 



Ribs. Large, often indistinct, unequal ; the primaries sometimes armed 

 with minute tubercles. 



Calice. Very wide and deep ; the edge almost circidar, crisped with 

 minute sinuosities. 



Plates. These are so irregular that it is difficult to count the cycles, 

 but they are at least four. Those of the first and second are more than 

 twice as high as the rest, and reach to the centre of the cup, where they 

 unite, but irregularly : the others are lower and shorter in gradation, the 

 lowest projecting little within the margin. All are perfectly separate 

 throughout, extremely thin, sharp-edged, the surfaces set with minute 

 granules often running in curved lines : the free edge of all is arched, and 

 their greatest width is one-third from the summit. The primaries and 

 secondaries are very salient, and the edge of the calice seen in profile 

 forms eleven or twelve triangular lobes. 



Columella and palules wholly wanting. 



ANIMAL. 



Form. 



Column. Actinia-like, without any trace of gemma?. 

 Disk. Radii fine, distinct. 



Tentacles. About 140, in four rows, close-set, irregular; the innermost 

 three or four times as large as the outermost : stem cylindro-conical, 



