PLATE V. 



Fig. 



12. Thamniscus dubius, ScMotheim. Portion of a branch, highly magnified, showing 



the mucro or denticle-like process (<?) on the proximal 

 lip of the cellule-apertures. Tunstall Hill. 



13. Acanthocladia anceps, ScMotheim. Figure a little enlarged. Humbleton Hill. 



14. — — Twice the natural size. Humbleton Hill. 



15. — — Magnified view, showing the cellule apertures. The surface 



of the specimens is rather abraded. Humbleton 

 Hill. 



16. — — Non-celluliferous surface. The dotted portions are im- 



pressions of the celluliferous surface, the coral being 

 removed. Humbleton Hill. 



17. — — Highly-magnified view of a natural impression of the cel- 



luliferous surface of a stem, exhibiting impressions of 

 the cellule-apertures {a), (?) gemmuliferous vesicles (b), 

 and foramina. Humbleton Hill. 



18. — — Transverse section (highly magnified) of a branch, showing 



casts of the cellules {a), and a vacancy left by the 

 removal of the basal plate {b). Humbleton Hill. 



