DESCRIPTION OF PLATES. 



165 



PLATE XVI. 



1. 



Crisia scalaris, anterior and pos- 





terior. 



2. 



Crisia acropora. 



3. 



Crisia macrostoma. 



4. 



Crisia macrostoma. 



5. 



Crisia gracilis. 



6. 



Crisia setosa. 



7. 



Crisia tenuis. 



8. 



Crisia acropora, ooecmm. 



9. 



Crisia acropora. 



0. 



Crisia eburnea. 



1. 



Crisia setosa. ' 



.2. 



Idmonea hochstetteriana, n.s. and 





magnified. 



13. Idmonea hochstetteriana, n.s. 



14. Idmonea hochstetteriana, ooecium. 



15. Idmonea hochstetteriana, var. n.s. 



16. Idmonea hochstetteriana, var. n.s. 



and magnified. 



17. Idmonea atlantica, n.s. and anterior 



and posterior magnified. 



18. Idmonea radians, n.s., a magnified, 



b more highly back and front. 



19. Idmonea incurva, n.s. and magni- 



fied. 



20. Idmonea serialis, n.s. and magnified. 



PLATE XVII. 



1. Idmonea milneana, n.s. and front 



and back magnified. 



2. Idmonea milneana, n.s. and mag- 



nified. 



3. Idmonea lata, n.s. and magnified. 



4. Idmonea contorta, n.s. and mag- 



nified. 



5. Idmonea contorta. 



6. Idmonea trigona, n.s. and magnified. 



7. Idmonea geminata, n.s. and mag- 



nified. 



8. Idmonea atlantica, n.s. and mag- 



nified. 



9. Idmonea venusta, n.s. and mag- 



nified. 

 10. Idmonea venusta. 



PLATE XVIII. 



1. Idmonea divergetis, n.s. and mag- 



nified. 



2. (Undetermined). 



3. Idmonea conferta, n.s. and mag- 



nified. 



4. Idmonea semispiralis, n.s. and mag- 



nified. 



5. Filisparsa orakeiensis, n.s. and mag- 



nified. 



6. Hornera curva, n.s. and magnified. 



7. Hornera frondiculata, n.s. and mag- 



nified. 



8 . Hornera frondiculata. 



9. Hornera elevata, n.s. and mag- 



nified. 

 10. Hornera quadrata, n.s. and mag- 

 nified. 



BB 



