GENUS IV. ULOCYATHUS (Saks). 
Flabellum (Gray). 
Corallum 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 Caryophjllia. 
Only one species has been recognised, U. arctkus. 
ULOCYATHUS ARCTICUS 
Sari) slightly magnified. 
