PLATE XXIII. 



Fenestella plebeia, M'Coy. (Page 185.) 

 Fig. 



1. Fragmentary specimen. 1 a. Portion, showing the striated non-poriferous side, and the section 



with four or six cells to a fenestrule (slightly restored), X 20. Pilton Beds. Porter 

 Collection. 



Fenestella ? umbrosa, ii. sp. (Page 186.) 



2. Fragmentary specimen in the condition of a cast, probably belonging to this species, but with 



very small fenestrules. 2 a. Portion, showing two cells to a fenestrule, X 20. Roborough. 

 Porter Collection. 



3. Fragmentary specimen of the radical portion of a frond. 3 a. Portion, showing the keeled and 



striated non-poriferous side, which sometimes appears to have two cells to a fenestrule, x 20. 

 Poleshill. Porter Collection. 



Fenestella polyporata, Phillips. (Page 188.) 



4. Fragmentary specimen of the poriferous face. 4 a. Portion, showing six cells to a fenestrule, 



the median keel, and the elevated cell-mouths, x 20. Pilton Beds. Hamling Collection. 



5. Fragmentary specimen of the radical portion of a frond. 5 a. Portion, showing the mode of 



branching, the cells, the cell-mouths, and the median keel, X 20. Pilton. Porter Collection. 



Penniketipora bipinnata, Phillips, sp. (Page 190.) 



G. Portion of a large cast, showing mouths of cells. 0«. Portion, showing two cells on the central 

 stem between each two of the branches, x 20. Poleshill. Porter Collection. 



7. Slab with several specimens retaining surface. 7 a. Portion of a frond, showing the central keels 



and the cell-mouths, x 20. Barnstaple. Woodwardian Museum. 



8. Specimen, showing the mode of branching. Pilton. Porter Collection. 



Penniretipora virgata, n. sp. (Page 191.) 



9. Fragmentary specimen. 9 a. Portion, showing the numerous cells between the subsidiary 



branches, X 20. Croyde Bay. My Collection. 



Streblotrtpa Gtregorii, Whidhorne. (Page 192.) 



10. Portion of a zoarium. 10 a. Portion of surface, showing the acute undulating ridges, the mouths 



of the zocecia and the mesopores, X 20. Pilton Beds. Hamling Collection. 



Ehabdomeson? gracile, Phillips, sp. (Page 194.) 



11. Portion of a zoarium. 11 a. Portion of surface, showing cell-mouths, X 20. Barnstaple. 



Woodwardian Museum (on a slab from which Sowerby's figure in ' Geol. Trans.,' ser. 2, vol. v, 

 pt. 3, pi. liii, tig. 17, was taken). 



12. Portion of a zoarium. 12 a. Portion of surface, showing celi-mouths and acanthopores, x 20. 



Ironpost. My Collection. 



13. Portion of the zoarium of a variety with larger cell-mouths. 13 a. Portion of surface, showing 



the long, oval cell-mouths and pores, X 20. East Anstey. My Collection. 



14. Cast of a zoarium, probably belonging to this species. 14 a. Portion, showing the form of the 



ceils, X 20. Pilton. Porter Collection. 



15. Portion of the natural section of a zoarium, probably belonging to this species. 15 a. Portion, 



showing the shape of the cells and the central axis, X 20. Pilton. Porter Collection. 



Leioclema? distans, Whidhorne, sp. (Page 196.) 



16. Portion of a zoarium. 16 a. Portion, showing the small, distant, oval cell-mouths and the scattered 



mesopores, X 20. Laticosta Cave, Baggy. Hamling Collection. 



Fistulipoha ? sp. (Page 197.) 



17. Specimen of a free zoarium. 17 a. Portion, showing the cells, x 15. Pilton. Porter Collection. 



Fistulipora (?), sp. (Page 198.) 



18. Specimen encrusting a coral, X 2. Frankmarsh. Barnstaple Athenaeum. 



19. Wax cast of the portion of another specimen, encrusting a crinoid stem, X 20. Barnstaple. 



Woodwardian Museum. 



