PLATE XXV. 



Fig. 1 . — Vertical section of the preceding specimen of Parallelopora darting- 

 tonensis, Cart, sp., enlarged 10 times. 



Fig. 2. — Tangential section of P. dartingtonensis , var. filitexta, Nich., from 

 the Middle Devonian of Teignmouth, enlarged 10 times. 



Fig. 3. — Vertical section of the preceding specimen, similarly enlarged. 



Fig. 4. — Tangential section of a typical example of Parallelopora Goldfussii, 

 Barg., enlarged 10 times, showing the perforate structure of the skeleton- fibre, 

 the apertures of the zooidal tubes, and the transversely partitioned astrorhizal 

 canals. Middle Devonian, Steinbreche, Refrath. 



Fig. 5. — Vertical section of the same, similarly enlarged, showing the characters 

 of the skeleton-fibre, the radial pillars, and the tabulate zooidal tubes. 



Fig. 6.- — Tangential section of the skeleton-fibre of a specimen of P. Goldfussii, 

 Barg., from the Middle Devonian of Devonshire, enlarged 40 times. 



Fig. 7. — Vertical section of the same, similarly enlarged. (Figs. 7 and 8 of 

 Plate XI, erroneously referred to Idiostroma ? capitatum, Goldf., really belong to 

 this species.) 



Fig. 8. — Tangential section of the preceding specimen of P. Goldfussii, Barg., 

 from the Middle Devonian of Devonshire, enlarged 10 times. The specimen is in 

 the " Caunopora-state." 



Fig. 9. — Vertical section of the same, similarly enlarged. The section shows 

 the infundibuliform tabula? of the " Caunopora-tubes." 



Fig. 10. — Tangential section of a specimen of Parallelopora capitata, Goldf. 

 sp., from the Middle Devonian of Teignmouth, showing the tabulate astrorhizal 

 tubes, enlarged 10 times. 



Fig. 11. — Tangential section of another specimen of the same from the same 

 locality and formation, similarly enlarged. 



Fig. 12. — Vertical section of the preceding specimen of Parallelopora capitata, 

 Goldf. sp., showing tabulate zooidal tubes and supposed " ampulla?," enlarged 10 

 times. 



Fig. 13. — Tangential section of a specimen of Parallelopora capitata, Goldf. 

 sp., from the Middle Devonian of Hebborn, showing the structure of the skeleton- 

 fibre, enlarged 10 times. 



