Fi 
oR 
PLATE V. 
Je Ehrenbergi, Gewtz. Non-celluliferous surface of a specimen, repre- 
sented of the natural size. Silksworth. 
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. 
Highly mannified view of celluliferous surface, showmg 
meshes (a); cellule-apertures (6); and _ cellule-inter- 
stices (c). At the left lower corner the surface of the 
coral or cellule-interstitial layer is removed, thereby 
showing the polygonal form of the cellules near their 
base. ‘Tunstall Hill. 
Highly-magnified view of the non-celluliferous surface 
marked (on the upper part of the figure) with fine, 
waved, longitudinal striz. At the right lower corner 
the striated surface is removed, disclosing the layer of 
vertical capillary tubes (z). Tunstall Hill. 
Highly-magnified figure, showing the polygonal form of 
the cellules at their base, the layer of vertical capillary 
tubes being removed. Silksworth. 
Diagram showing the form and position of the cellules (a): 
6, the basal plate ; ¢, the cellule-interstices. 
6*. This figure is cancelled. 
7. Thamniscus dubius, Schlothem. Twice the natural size. Non-celluliferous surface. 
Humbleton Hill. 
Portion of the last, highly magnified, showing the foramina 
and waved longitudinal strie. 
Highly-magnified view of the celluliferous surface of a 
specimen, showing the cellule-apertures. Tunstall Hill. 
Specimen, a little enlarged, of a variety with the stems and 
branches conjomed. Tunstall Hill. 
Highly-magnified view of the natural impression of a branch, 
showing impressions of the cellule-apertures (a); the 
gemmuliferous vesicles (4) ; annular impressions of the 
mouths of the latter (c); impressions of accessory 
vesicles (¢) ; impressions of the mucro or denticle-like 
process (¢) beneath the cellule-apertures ; and strong, 
waved, longitudinal lines on the cellule-interstices. 
Humbleton Hill. 
