PLA.TE V. 



Fig. 



1 . Phyllopora Ehrenbergi, Geinitz. Non-celluliferous surface of a specimen, repre- 



sented of the natural size. Silksworth. 



2. — — A little enlarged. The upper part at the right side ex- 



hibits the outer or celluliferous surface ; the lower 

 portion is an impression of the inner or non-celluliferous 

 surface. Silksworth. 

 3 — — Highly-magnified view of celluliferous surface, showing 



meshes {a) ; cellule-apertures {b) ; and cellule-inter- 

 stices {c). At the left lower comer the surface of the 

 coral or cellule-interstitial layer is removed, thereby 

 showing the polygonal form of the cellules near their 

 base. Tunstall Hill. 



4. — — Highly-magnified view of the non-celluliferous surface 



marked (on the upper part of the figure) with fine, 

 waved, longitudinal striae.' At the right lower corner 

 the striated surface is removed, disclosing the layer of 

 vertical capillary tubes {a). Tunstall Hill. 



5. — — Highly-magnified figure, showing the polygonal form of 



the cellules at their base, the layer of vertical capillary 

 tubes being removed. Silksworth. 



6. — — Diagram showing the form and position of the cellules {a): 



b, the basal plate ; c, the cellule-interstices. 

 6*. This figure is cancelled. 



7. Tharaniscus dubius, ASb/^/o^/^em. Twice the natural size. Non-celluliferous surface. 



Humbleton Hill. 



8. — — Portion of the last, highly magnified, showing the foramina 



and waved longitudinal striae. 



9. — — Highly-magnified view of the celluliferous surface of a 



specimen, showing the cellule-apertures. Tunstall Hill. 



10. — — Specimen, a little enlarged, of a variety with the stems and 



branches conjoined. Tunstall Hill. 



11. — — Highly-magnified view of the natural impression of a branch, 



showing impressions of the cellule-apertures {a) ; the 

 gemmuliferous vesicles {b) ; annular impressions of the 

 mouths of the latter [c] ; impressions of accessory 

 vesicles {d) ; impressions of the mucro or denticle-like 

 process [e] beneath the cellule-apertures ; and strong, 

 •waved, longitudinal lines on the cellule-interstices. 

 Humbleton- Hill. 



