PLATE J. 



Fig. I. Palceacis cuneiformis. A series of individuals showing 

 alternate bilateral budding. X 2. 



Fig. 2. Palceacis obtusa. View of the calices of a mature 

 corallum. The lowermost in the figure is the 

 oldest, and was followed successively by the upper- 

 most, the one at the left, and the one at the 

 right. X 2. 



Fig. 3. Palceacis obtusa. Transverse section showing canals 

 (white), radiating fibres, and infiltration of silica and 

 piyrite (black). X 8. 



Fig. 4. Microcyathiis depresses. Transverse section showing 

 skeletal structure, openings of canals into interior 

 cavity, and calicular ridges. X 8. 



Fig- 5- Calostylis denticulata. A corallum which shows the 

 pinnate arrangement of septa. Nat. size. 



Fig. 5a. A detail of the same specimen. X 2. 



Fig. 6. Calostylis denticulata. Tracing of a microphotograph 

 showing quadriseptate arrangement of septa in the 

 upper (cardinal) quadrants. X H- 



Fig. 7. Heterophyllia cf . sedgzvicki. View of a calyx which 

 shows an imperfect quadriseptate grouping of the 

 septa. X 4. 



Fig. 8. Heterophyllia cf. sedgwicki. Retouched photograph of 

 a transverse section showing a complete quadrisep- 

 tate group in the lower right-hand quadrant. X 7- 



Fig. 9. Hexaphyllia cf. mccoyi. Transverse section showing 

 bilateral symmetry. X 8. 



Fig. ID. Pachyphyllum woodmani. View of attachment surface 

 of colony showing a tracing of the protocorallite with 

 four septa. X 5- 



