68 



CCELENTERATA AND 



Apical area with irregular plates. Pluteus without anal 

 rods. 



/S. Drobachiensis. 

 C lyp eastroids . 



JEchinarachnius. Body nearly circular, very flat with 

 sharp, entire margin. Vent close to edge. Petaloid re- 



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ECHINARACHNIUS. 



gion marked. Spines small, short, brown or reddish color. 

 Pluteus without anal rods. 



E. parma. 



Spatangoids. 



Schizaster. Body heart-shaped, irregular, oval with 

 avenues on the upper surface. Mouth asymmetrical. Test 

 thin, fragile. Ambulacra! zones depressed and petaloid. 

 Pluteus with single median calcareous rod on the anal lobe. 



S. fragilis. 



