PLATE XI^ 



Clypeaster subdepressus, /. i, 2. 



1. Seen from abactinal side, specimen with thick edge, | nat. size. 



2. Seen from actiual side, specimen with thick edge, | nat. size. 



Ecbinocyamus pusillus, / S. 



3. Seen from above, magnified three diam. 



Echinarachnius parma, f. 4, 5. 



4. From actinal side, denuded, nat. size. 



5. Same from abactinal side, nat. size. 



