SUB-CLASS IT 
Plesiastraea, From. 
all the cycles excepting the 
last. Tertiary and Recent. 
Isastraea, E. and H. (Fig. 
145). -Corallites_ prismatic, 
closely crowded, and with 
fused walls. Calices _ poly- 
gonal; columella imperfect 
or absent. ‘Trias to Cre- 
taceous. 
Latimaeandra, VOrb. (Fig. 
146). Like the preceding, 
but with the calices situated 
in short furrows. ‘Trias to 
Cretaceous. 
Stylastraea, From. Laas. 
Amphiastraea, From. Upper 
Jurassic.  Leptastraea, Solen- 
astraea, Prionastraca, E. and H., 
etc. Tertiary and Recent. 
¢ Massive coralla multiplying 
by fission. 
Favia, Oken (Fig. 147). 
Corallum massive;  calices 
oval or distorted, and united 
by confluent costal septa ; columella spongy. 
Goniastraca, KE. and H. Corallites prismatic, calices polygonal. 

Hint! 

Fic. 147. 
Favia caryophylloides, 
From. Coral-Rag; Natt- 
heim. Natural size. 


Fic. 144. 
Heliastraea conoidea, Reuss. 
Miocene; Enzesfeld, near 
Vienna. a, Corallum, natural 
size; b, Calices enlarged. 



Fic. 148. 
Calamophyllia Stokesi, E. and H. 
Coral-Rag ; Steeple Ashton, England. 
Natural size. 
HEXACORALLA—A POROSA—ASTRAEIDAE 87 
Like the preceding, but with several pali in front of 

Fic. 145. 
Tsastraea- helianthoides, Goldf. 
sp. Coral- Rag; Nattheim. 
Natural size. 
z 
NSS 
MMA 
NY 
S28 : 

Fic. 146. 
Lautimaeandra 
seriata, 
Beck. Coral-Rag ; Natt- 
heim. Natural size 
(after Becker). 
Jurassic to Recent. 
Septa well 


Fie. 149. 
trichotoma, 
Coral-Rag; Natt- 
Natural size. 
Thecosmilia 
Goldf. sp. 
heim. 
developed ; columella spongy ; pali in front of all cycles excepting the last. 
Cretaceous to Recent. 
yn. Branching coralla multiplying by fission. 
Calamophyllia, Blainy. (Rhabdophyllia, EB. and H.; Lithodendron, p. p. Mich.), 
(Fig. 148). 
Colony fasciculate or bushy ; corallites very long, cylindrical. 
