PLATE XXIII. 



Fig. 1. — Portion of a polished specimen of Stromatopora Garteri, Nich., of the 

 natural size, showing the growth of the coenosteum in latilamina?. From the 

 Wenlock Limestone of Ironbridge. 



Fig. 2. — Vertical section of the same, enlarged about 10 times. 



Fig. 3. — Tangential section of the same, similarly enlarged. 



Fig. 4. — A fragment of Stromatopora Biicheliensis, Barg., var. digitata, Xich , 

 of the natural size. Middle Devonian, Pit Park Quarry, Dartington. 



Fig. 5. — Part of a polished transverse section of another specimen of the same 

 species from the same locality, natural size. 



Fig. 6. — Vertical section of a specimen of Stromatopora Biicheliensis, Barg., 

 from the Middle Devonian of Teignmouth. Enlarged about 10 times. 



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



Fig. 8. — Portion of a polished specimen of Stromatopora Beuthii, Barg., cut 

 tangentially, of the natural size. Middle Devonian, South Devonshire. 



Fig. 9. — Portion of a similar polished specimen of the same species, cut verti- 

 cally, of the natural size. Middle Devonian, Teignmouth. 



Fig. 10. — Tangential section of Stromatopora Beuthii, Barg., enlarged about 

 10 times. Middle Devonian, Pit-Park Quarry, Dartington. 



Fig. 11. — Vertical section of the same specimen, similarly enlarged. 



Fig. 12. — Tangential section of a specimen of Stromatopora Beuthii, Barg., 

 from the Middle Devonian of South Devonshire (Bishopsteignton ?), enlarged 

 about 10 times. The section shows, more distinctly than fig. 10, the cut ends of 

 the radial pillars immersed in the general reticulation. 



Fig. 13. — Tangential section of Stromatopora Beuthii, Barg. (?), in the 

 " Caunopora-state," enlarged about 10 times. In this condition sections of S. 

 Beuthii are hardly, or not at all, distinguishable from similar sections of S. Hiipschii, 

 Barg. Middle Devonian, Teignmouth. 



