PLA.TE VII. 



Fig. 1. Transverse section of Syringostroma centrotum. The figure shows two 

 monticules with axial tubes. The concentric groups of apertures probably 

 represent the cut ends of astrorhizal systems. The skeleton-fiber is mi 

 nutely reticulated, x 15. 



Fig. 2. Longitudinal section of the same showing the continuous radial pillars. 

 X 15. 



Fig. 3. Syringostroma consimile . Transverse section showing a low monticule 



with an axial tube and a very strong and complex astrorhizal system. 



Xl5. 

 Fig. 4. Longitudinal section of the same illustrating the independent flexures 



of the laminae. The radial pillars in this and the following species are 



not systematically continuous . x 15. 



Fig. 5. Transverse section of Syringostroma Barretti, which shows a low 

 monticule with its tubular axis, and a very complex, extended astrorhizal 

 system. X 15. 



Fig. 6. Longitudinal section of the same. This section shows the reticulated 

 structure of the skeleton-fiber and the wave-like flexures of the laminae. 



