﻿PLATE XXVI. 



Fig. 1. — Surface of a specimen of Stromatoporella granulata, Nich., of the 

 natural size. Devonian (Hamilton Formation), Arkona, Ontario. 



Fig. 1 a. — Tangential section of the same, enlarged about ten times. 



Fig. 1 b. — Vertical section of the same, similarly enlarged. 



Fig. 2. — Surface of a specimen of Stromatoporella Selwynii, Nich., enlarged. 

 Devonian (Corniferous Limestone), Port Colborne, Ontario. This figure is repeated 

 from PI. I, fig. 14, where it is referred to Stromatoporella granulata, Nich. 



Fig. 3. — Tangential section of the same, enlarged about ten times. (The 

 section is slightly oblique.) 



Fig. 4. — Vertical section of the same, similarly enlarged. 



Fig. 5. — Tangential section of Stromatoporella socialis, Nich., showing part of 

 one of the astrorhizal cylinders, enlarged about ten times. Middle Devonian, 

 Teignmouth [pebble in the Triassic conglomerates]. 



Fig. 6. — Tangential section of another specimen of the same, from the same 

 locality, showing " Orm»,opora-tubes." Enlarged about ten times. 



Fig. 7. — Vertical section of the preceding specimen, similarly enlarged. 



