



Plate 13. 



Fig. 1. Thenea lamelliformis. Spirasters ; x 600. 



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2. Thenea fenestrata 0. Schm. From a photograph ; from above; \ 



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Spirasters; x 600. 

 Protriaene; x 100. 



5. Thenea pyriformis . From a photograph; from the side; \. 



6. Thenea fenestrata O. Schm. Protriaene; x 100. 



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« « " Dichotriaene, modified toward protriaene ; x 100, 



8. Thenea pyriformis. From a photograph ; from above ; \. 



9. Thenea fenestrata O. Schm. From a photograph ; from the side ; \. 



10. Thenea pyriformis. Parenchymal microscleres ; x 600. 



11. " " Microscleres of dermal membrane; x 600. 



12. Poecillastra tricomis. Annulated microxea; x 150. 





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Triaene with reduced rhabdome; from the side; x 30. 

 Microxea, nearly smooth; x 400. 





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