PLATE 40 A. 



Fig. 1. 539, 1. Trematopora tuberculosa. (Pag. 149.) 



1 a. A fragment with parts of several branches, showuig tlie tuberculous character very distinctly. 

 1 b. A smaller bifurcating branch of the same species. 

 1 c. A small branch scarcely showing the tuberculous character. 



1 d. The surface magnified, where the apertures are close together, and irregular in their arrangement. 

 1 c. A surface somewhat worn, where the openings are less closely arranged. 

 1 /. The apertures of several cells, showing minute points or spinules around the aperture. 



1 g. A transverse section of a stem enlarged, showing the internal structure. 



Fig. 2. 540. 2. Trebiatofora coalescens. (Pag. 150.) 



2 a. A fragment showing several branches coalescing. 



'2 b. A portion of the surface enlarged, showing the apertures where worn and unworn. The cells are to 

 some extent une.|ually distributed over a parf- of the coral. 



Fig. 3. 541. 3. Trematopora tubulosa. (Pag- 151.) 



3 a. A fragment of a stem of the natural size. 3 6. A section of the end of the stem. 



3 c, c. Portions of the surdice enlarged, .showing the form and arrangement of cells. 



Fig. 4. 542. 4. Trematopora punctata. (Pag- 151.) 



4 a. A coral of this species enveloping a fragment of a crinoidal stem. 



4 6. A portion of the surface enlarged, shov\ing the form and arrangement of the apertures, which are some- 

 times close togetlier and in other parts separated. 



4 c. A section of the stem enlarged, sliovving the structure of the coral. 



Fig. 5. 543. 5. Trematopora ostiolata. (Pag- 152.) 



5 a. A specimen showing the coral surrounding the stem of a crinoid, and throwing out branches in several 



directions. 5 6. A fragment of a bifurcating branch. 



5 c. An enlargement of the surface from the sjime specimen. 

 5 d. A fragment slightly nodose, and having the apertures of the cells somewhat irregularly distributed over 



the surface, and the oval form rather more elongated than in the preceding figure. 



5 e. A portion of the surface of the same enlarged. 



5/, g. Fragments showing the irregular mode of branching. 



6 h. An enlarged portioa of fig. -5 g, where the elevated border of the aperture is more perfectly preserved. 

 5 i. The end of a stem enlarged, showing the arrangement of cells and interspaces. 



5 ft. A portion of the last still further magnified, showing the structure of the intercellular spaces, and the 



empty or solid cells without visible septa. 

 5 Z. A longitudinal section of a hollow stem enlarged, showing the direction of cells. 

 5 / t- Magnified from 5 I. 



5 m, n. A small bifurcating stem, and an enlargement of the same, showing some slight variation in the 



character of the apertures of the cell. 



Fig. 6. 544. 6. Trematopora solida. (Pag- 153.) 



6 a. A fragment of a solid stem, spreading and slightly flattened above. 

 6 b. A fiaginent of a bifurcating stem. 



6 c. Enlargements of tlic surface, showing form and arrangement of the cells. 



Fig. 7, 8. 545. 7. Trematopora striata. ( Pag. 153.) 



7 a. The base or attached portion of an individual of this species, having two diverging branches. 



7 b. The same enlarged, showing the form of the apertures of the cells and the strongly striated base. 



7 6 t- A portion still farther magnified from 7 a, b. 7 c. A small fragment of the same species. 



8 a, b. Tlie fragment natural size and enlarged. 8 6 t- A portion still farther magnified from 8 a. 



Fig. 9. 546. 8. Trematopora granulifera. ( Pag. 154.) 



9 a. A bifurcating branch of this species, where the surface is beautifully granulated. 

 9 6. An enlarged portion of the same .specimen. 



9 c, rf. A small cylindrical stem, and an enlargement, showing the fibrous structure in a longitudinal direction. 



9 e. A stem having several branches. 



Fig. 10. 547. 9. Trematopora aspera. (Pag- 154.) 



10 a. A fragment of a stem of the natural size. 



10 b. A portion magnified, showing the spinulose surface and crenulated margins of the apertures. 



10 c. Two small fragments showing a peculiar mode of branching. 



Fig. 11. 548. 10. Trematopora spinulosa. (Pag- 155.) 



11 a. Fragment of a small cylindrical stem without branches. 11 b. A bifurcating branch. 



11 c. An enlargement of the surface, showing the spinules. 



Fig. 12. 549. 11. Trematopora sparsa. (Pag- 155.) 



12 a. A bifurcating branch of this coral, scarcely worn. ^ 



12 b. A simple slender branch of tlie same species, having tBe surface worn. 



12 c, d. Enlargements from the surfaces of the same. 



13 a. TJndescribed species of Trematopora. 13 b. Surface enlarged. 

 14. Termination of a branch of Callopora clegans, from fig. 1 e, Plate 4*^ 



