424 PROCEEDINGS OF THE ACADEMY OF [1888^ 



The form described differs from Coronaster Parjaiti, Perrier, the 

 only other species of the genus, principally by the character above 

 mentioned, viz, the existence of two spines on each adambulacral 

 plate. It also differs by its greater size, the radius of the disk being 

 twice as great, and the arms from the centre of the disk to their tips,, 

 three times as long. 



