LIST OF ILLUSTEATIONS IX THE TEXT. 
Fig. 
10 . 
11 . 
12 . 
13 . 
14 . 
15. 
16. 
17 . 
18. 
19. 
20 . 
21 . 
22 . 
23. 
24. 
25. 
26. 
27 . 
28. 
29. 
Hornera lichenoides (Linn.), longitudinal section 
Petalopora costata (d’Orb.), section through wall (after 
Pocta) 
Sparsicavea undulata (Hag.), longitudinal section 
Siphodictyum gracile^ Lonsd., longitudinal section 
Ceramopora niagarensis^ Bassler, vertical tangential 
section (after Bassler) 
Eridotrypa nodidosa, Bassler, 
section (after Bassler) ...... 
Trematopora debilis, L^lr., vertical section (after 
Ulrich) 
Callopora elegantula, Hall, tangential section (after 
Ulrich) . 
Heterotrypa infiecta. 
PAGE 
xxi 
vertical tangential 
XXI 
xxii 
xxii 
xxxvn 
xxxvii 
XXXVlll 
Ulr., vertical section (after 
Ulrich) ........ xxxviii 
Atactoporella ortoni^ Xich., vertical section . xxxviii 
Actinopora disticha (Hag.) 9 
A. diadema (Goldf.) 17 
A. diadema (Goldf.), horizontal section . . . 17 
A. diadema (Goldf.), young zoarium . . . . 18 
A. diadema (Goldf.), slightly older zoarium . . 18 
Multitnhigera sidcata^ Greg. 24 
Fascicidipora spicata, Glreg., a, 6, views of a zoarium ; 
c, d, surface enlarged 41 
Cyrtopora elegans^ Hag., small zoarium ... 54 
G. elegans. Hag., upper part of zoarium with gonoecium. 54 
C. elegans^ Hag., longitudinal section .... 55 
C. elegans, Hag., transverse section .... 55 
Oscidipora repeals (Kag.), ‘d. zoarium .... 61 
0. repens (Hag.), longitudinal section . . . 61 
O.filix (Hag.), end of a branch with gonoecium . . 65 
0. filix (Hag.), end of a branch with gonoecium . . -65 
Homoeosolen ramulosus^ Lonsd., young zoarium, obverse 
and reverse 79 
H. ramulosus^ Lonsd., longitudinal section ... 79 
H. gamhlei, Greg., longitudinal section ... 86 
Besmepora semicylindrica (Rom.), medial section . 112 
