PLATE 21. 



Geodia mesotriaena Lendenfeld. 



Fig. 1. — var. pachana Lendenfeld. 

 Figs. 2-6. — var. megana Lendenfeld. 



1. — Dry specimen of var. pachana seen from above; reduced 1 :0.67; phot. Zeiss, anastig. 480/ 



412. 



2. — Radial section of a spirit specimen of var. megana; reduced 1 :0.67; phot. Zeiss, anastig. 480/ 



412: 



a, hirsute part, where the projecting spicules have not been broken off; b, praeoscular cavity. 

 3-6. — Teloclades of var. megana; magnified 10: phot. Zeiss, planar 50: 



3, 5, orthotriaenes fully developed; 



4, young orthotriaene; 

 6, mesoprotriaene. 



