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Plate 12. 



Fig. 1. Thenea echinata. Upper surface ; from a photograph ; \. 



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From a radial section ; upper surface of sponge and adjoin- 

 ing parenchyma; x 20. 



Spirasters ; x 600. 



Protriaene ; x 30. 



Dichotriaene, modified toward protriaene ; x 30. 



Spicule from root ; clavate at one end ; x 100. 



Cladome of dichotriaene ; x 30. 



Somal anatriaene ; x 100. 



From a photograph ; from the side ; ■}-. 



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10. Thenea lamelliformis . Anatriaene, somal ; x 150. 



Anatriaene, radical ; x 150. 



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Anatriaene, somal; x 40. 



Upper surface ; from a photograph ; \. 



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