PLATE II. 



Fig. 



1 . Scyphia tuberculata, King. Twice the natural size. Humbleton Hill. 



2. — — Thrice the natural size. With indistinct indications of ex- 



current openings on the crown of the tubercles. Dalton- 

 le-Dale. 



3. Mammillopora mammillaris. King. Twice natural size. Humbleton Hill. 



4. — — Highly-magnified view of one of the mammillae showing 



the polygonal pores. 



5. Tragos Tunstallensis, King. A little enlarged. Tunstall Hill. 



6. — Binneyi, King. Four times less than the natural size. Bedford, near 



Manchester. Mr. E. W. Binney's specimen. 



7 Bothroconis plana, King. Portion (natural size) of a large specimen. Tunstall 



Hill. 



la — — Highly-magnified figure showing hemispherical cavities [a), 



and the supposed excurrent openings (<5). 



8. Fenestella retiformis, ScMotheim. Natural size. Humbleton Hill. 

 8«. — — — Idem, Idem. 



9. — — Highly-magnified view of stems or ribs {a), showing cellule- 



apertures (5), and the dividing ridge (c) slightly tuber- 

 culated : d, meshes, e, transverse processes. 



10. — — Figure showing the tubercles (? gemmuliferous vesicles) on 



the ridges, more developed than in the last. 



11. — — Figure showing the same structures open at the summit. 



(Through a mistake the letter y points to the cellule-apertures instead 

 of the tubercles on the dividing ridges.) 



12. — — Figure showing (?) gemmuliferous vesicles closed. 



13. — — Highly-magnified view of a natural impression of the cellu- 



liferous surface, showing impressions of the stems or ribs 

 («), cellule-apertures [b), meshes {d), and (?) gemmuliferous 

 vesicles (/). (The right-hand letter d should be b.) 



14. — — Natural impression of non-celluliferous surface, showing 



impressions of the ribs, transverse processes, and meshes. 



15. — — Magnified view of casts of cellules (a) from their under or 



basal side. 



16. — — Highly-magnified view of non-celluliferous surface of stems 



or ribs, showing foramina (a). 



17. — — Figure showing foraminated, vertical, capillary tubes form- 



ing the non-celluliferous portion of the ribs. 



18. — — Figure of a gutta-percha cast of a natural impression 



showing root-like processes. Natural size. 



19 — — Magnified view, showing the root-like processes striking 



off from the stem. 



