PLATE XIX. 



All the figures in this Plate are from specimens from Lummaton in my Collection except token 



otherwise stated. 



Poltpoea poptjlata, n. sp. (Page 174.) 

 Fig. 



1. Transparent section, showing the arrangement of the cells and their invasion of the dissepiments, 



x 10. la, another part of the same section, showing the vertical arrangement of the cells 

 and the cell mouths, X 10. 



Fenestella delta, n. sp. (Page 169.) 



2. Specimen showing keeled branches, angular in section, with five cells to a fenestrule x 10. 



Fenestella fanata, n. sp. (Page 165.) 



3. Transparent section, showing the shape of the cells with long narrow mouths, and about four cells 



to a fenestrule, x 10. 



4. Vertical section, possibly of this species, x 10. 



Fenestella arthritica, Phillips. (Page 170.) 



5. Portion of a flat frond, natural size, somewhat worn. 5 a, a small portion of the same, x 10, 



showing remains of the granulations and the longitudinal striation. 



6. Another specimen, with the surface perfectly preserved, showing the branches covered with 



granulations, X 10. 



7. Transparent section, showing the oval fenestrules, the cells, and the elevated central keel, x 10. 



8. Transparent section taken across a branch, showing the central keel and the shape and mouths of 



the cells, x 10. 



9. Transparent section taken along a branch, showing nodules, X 10. 



10. A fragment of a worn frond probably of this species, apparently showing the inner or 



unkeeled surface. 10 «, natural section along a branch, x 10, showing the supports of the keel. 



Fenestella subrectangtjlaris, Sandberger. (Page 173.) 



11. Large specimen, natural size. 11 a, portion of exterior surface, x 10, showing the elevated 



rounded branches and the frequently parallel arrangement of the fenestrules. Wolborough. 

 Vicary Collection. 



12. Another specimen of an apparently conical specimen having the same characters. 12 a, small 



portion enlarged, showing two cells only to a fenestrule. 



Hemiteypa oculata, Phillips. (Page 179.) 



13. Fragment of a frond of natural size, showing the inward surface except in a small portion, which is 



broken away, and exposes the outer surface. 

 1 I . Small portion of the inward surface, showing its striation, x 10. 

 15. Idealised view of a specimen, X 20, showing the fenestrules, the position of the cells, the 



supports of the external guard, and the arrangement of that guard. 

 L6. Section across a specimen, X 5, showing its conical form, the arrangement of the cell-bearing 



branches and the supports of the guard. 

 17. Another specimen, x 10, showing in addition the section of the external guard and the 



alternating arrangement of the cells. 

 L8. Transverse transparent section of another specimen, showing the arrangement of the cells, the 



pillars, and the external guard. 

 L9. A small specimen, x 3, showing its general shape and the arrangement of the guard. 

 20. Transparent section, probably of a specimen of this species, which has lost the guard, X 10. 



