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GENUS IV. ULOCYATHUS (Saes). 



Flabellum (Gray). 



Coralhim simple, free, turbinate, with traces of 

 adherence (in the young state) on a very short wedge- 

 shaped crooked pointed base. 



Columella and palules entirely wanting. 



Ribs not at all prominent, sometimes obscure. 



Plates very thin, high, very salient above the margin 

 of the cup, distinct throughout their length. 



Calice very deep ; the margin sinuous and crisped. 



Animal resembling that of Caryophyllia. 



Only one species has been recognised, U. arcticui 



ULOCYATHUS ARCTICUS 



(after Sars) slightly magnified. 



