PLATE 40 B. 



Fig. 1. 550. 1. Striatopora flexuosa. i^^g- 156.) 



1 a. A bifurcating stem, showing the spreading branches to be lax or flexuous. 

 1 b. A fragment showing some differences in form of apertures and enclosing spaces. 

 1 c. A fragment showing irregular branching. 

 1 d. Several apertures with the enclosing angular spaces enlarged. 



1 c. A transverse suction enlarged, showing the form of cells internally. 



Firr. 2. 551. 9. Stictopora pua'ctipora. (Pag- 157.) 



2 a. A fragment of a bifurcating stipe of this species, natural size. 



2 6. A portion of the surface enlarged, showing form and arrangement of cells. 



2 c. An enlargement of the fragment referred to above, showing the bases of two cylindrical stems con- 



nected with the flattened stipe, and the rows of cells continuous from one to the other. 



Fig. 3. 552. 1. Diamesopora dichotobia. ( Pag. 158.) 



3 a. A fragment of a stem bifurcating above and longitudinally divided below, showing the striated interior. 

 3 b. The surfkce enlarged, showing the form and arrangement of apertures. 



3 c. An enlarged portion where the ridges between rows of cells are conspicuous. 



3 rf. A fragment of a stem preserving a cylindrical form, and commencing to bifurcate above. In the trans- 



verse sections of the two branches, one is solid while the other is hollow. 



Fig. 4. 553. 1. Clathropora alcicornis. (P^g- 159.) 



4 a. A portion of the stipe and branches of an individual of this species, natural size. 

 4 6. A portion enlarged, showing the oblong quadrangular apertures. 



4 c. An enlargement of another portion of the surface, showing a difference in the form of the apertures. 



Fig. 5. 554. 2. Clathropora frondosa. ( Pag. 160.) 



5 a. A fragment from a much larger frond. 



6 6. A small fragment where the perforations are smaller, though the coral does not apparently differ in 



other respects from the preceding. 

 5 c. An enlarged portion of the surface, showing the arrangement of cells in reference to the perforations. 

 5 d. An enlargement where the cells are arranged in series parallel to the axis of the branch. 

 5 e. A section of a branch enlarged, showing arrangement and upward divergence of the cells. 



