Fig. 
Fig. 
Fig. 
PLATE IV. 
e. 1. Phymastrea aspera, a part of the corallum ; natural size. 
Fig. la. A vertical section of a part of the wall, with septa and intermural spaces ; magnified. 
Fig. 1). A transverse section across a part of three calicles, with intermural spaces. 
Acanthastrxa irregularis, a part of the corallum ; natural size. 
Fig. 2a. A magnified view of the wall at the junction of five calicles, with septa 
Cyphastrea aspera, the corallum ; natural size. 
Fig. 3a. A magnified view of a calicle. 
Cyphastrea brueggemanni, the corallum ; natural size. 
Fig. 4a. A part of the corallum ; magnified. 
Galaxea aspera, a part of the corallum ; natural size. 
Fig. 5a. A lateral view of a calicle (restored). 
Fig. 5). A section of the cells of the peritheca. 
Fig. 5c. The cells of the peritheca ; surface view. 
Big. 5d. A ealicle, seen from above ; magnified. 
is fo} 
Galaxea explanata, a part of the corallum ; natural size. 
Fig. 6a. A calicle, seen from above ; magnified. 
Fig. 60. A lateral view of a calicle. 
Fig. 6c. A section of the cells of the peritheca. 
Fig. 6d. The cells of the peritheca ; surface view. 
Galaxea fragilis, a part of the corallum ; natural size, 
Fig. 7a. A calicle, seen from above ; magnified. 
Fig. 7). A lateral view of a calicle (restored). 
Fig. 7c. A section of the cells of the peritheca. 
Fig. 7d. The cells of the peritheca ; surface view. 
