Geodia breviana Lendenfeld. 



Figures 1-27. 



1-4. — Large choanosomal amphioxes; magnified 30; phot. Zeiss, planar 20. 

 5-7. — Cladomes of anatriaenes; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 

 8-13. — Small stroiigj-losphaerasters; magnified 1800; u. v. phot. Zei.ss, q. monochr. 1.7, q. oc. 10: 

 8, 9, group of two strongylosphaerasters from a centrifugal spicule-preparation; 

 8, focused higher; 9. focused lower; 



10, group of two strongj'losphaerasters from a centrifugal .spicule-preparation; 



11, 12, a strongylosphaeraster; 



1 1 , focused higher ; 12, focused lower; 

 13, a strongylosphaeraster. 

 14. — Cladome of a mesoprotriaene; magnified 100; phot. Zeiss, apochr. 16. compens. oc. 6. 

 15-17. — Ortho- and plagiotriaenes; magnified 30; phot. Zeiss, planar 20. 

 18-22. — Groups of asters from centrifugal spicule-preparations; magnified 300. 



18, 20-22, u. V. phot. Zeiss, q. monochr. 1.7; 



19, phot. Zeiss, apochr. 4, compens. oc. 6; 



a, large oxyasters; b, small strongylosphaerasters; c, large oxysphaeraster. 

 23. — A sterraster; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 



24-27. — Large oxyasters and oxysphaerasters; magnified 1800; u. v. phot. Zeiss, q. monochr. 1. 

 00. 10: 



24, 27, two large oxyasters; 



25, 26, a large oxysphaeraster; 



25, focused higher; 26, focused lower. 



Geodia mesotriaenella Lendenfeld. 



Figures 28-35. 



28-30. — Mesoprotriaenes ; magnified 100; phot. Zei.ss, apochr. 16, compens. oc. 6. 



31. — Group of megascleres from a spicule-preparation; magnified 30; phot. Zeiss, planar 20: 



a, orthotriaenes; b, mesoprotriaenes; c, large choanosomal amphioxes. 

 32-35. Cladomes of anatriaenes; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 



