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Plate 20. 





Fig. 1. 



Iophon indentatus. From a photograph ; x 



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2. Iophon chelifer ostia-magna. 



5. 



6. 



Microscleres ; a, bipocillus from concave side and 

 smaller end ; b, anisochela in lateral view ; 



c, bipocillus in slightly oblique lateral view ; 



d, bipocillus from concave side, larger plate 



in optical section ; x 1000. 



3. Iophon lamella. From a photograph. Oscula depressed and surrounded with 



collenchyma; x-j-. 



4. Iophon chelifer ostia-magna. From a photograph. Margin of sponge, with large 



oscula, to the right; x \. 



Iophon indentatus. Skeletal style ; x 250. 



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Tylote ; x 250. 





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7. Iophon lamella. Microscleres ; a, bipocillus from convex side ; 6, anisochela in 



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 9. 



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14. 

 15. 



16. 



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lateral view ; c, bipocillus in lateral view ; x 1000. 

 Skeletal style; x 250. 

 Tylote ; x 250. 



10. Iophon chelifer ostia-magna. Skeletal style ; x 250. 



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Tylote ; x 250. 



12. Iophon lamella. From a photograph ; upper surface ; x \. 



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From a photograph. Lower surface of the specimen shown in 

 Kg. 12; xf 



Iophon lamella indivisus. From a photograph ; under surface; x \. 



Microscleres ; a, bipocillus from convex side ; b, 

 anisochela in ventral view ; c, bipocillus from 

 concave side; d, bipocillus in lateral view; e, 

 bipocillus, apical view of larger end ; f bipo- 

 cillus, apical view of smaller end; x 1000. 



From a photograph. Upper surface of specimen 

 shown in Fig. 14; x {. 



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