PLATE 18. 
' 
Fig 
Fig. 3. 423. 1. Heeopora frag-ilis; (Pag. 44.) 
3 a. Fragment of the ordinary character. 3 b. A fragment showing the thickened termination. 
3 c. A specimen having a single branch, the stipeand branch both having enlarged extremities. 
3 d. The specimen 3 b enlarged. 3 c. A portion of another specimen enlarged. 
3 f. A small specimen of limestone with fragments of this coral upon its surface. 
Fig. 4. 424. 7. Stictopora crassa. (Pag. 45.) 
4 a & b. Two fragments, natural size. 
4 c. A portion enlarged, showing the striated surface of the intercellular spaces. 
Fig. 5. 425. 8. Stictopora rarttora. 
5 a, b. Two specimens of this species. 5 c. A portion enlarged 
Fig. 6. 426. 1. Phjenopora explanata. 
6 a. A small unworn fragment, of the natural size. 
6 &'§■ d. A similar fragment, with the surface somewhat abraded. 
A portion enlarged. 
427. 2. Phjenopora constellata. (Pag. 47.) 
A portion of a large specimen, showing the entire width of the stipe. The specimen shows only the 
bases of the cellules, the upper portion with the centre having beeu broken away. 
A fragment presenting casts of the cellules, the calcareous matter being removed. 
A surface showing the bases of the cellules at their origin. 
A portion of 7 a enlarged. 
A portion of surface of 7 b enlarged. 
428. 3. Ph^nopora ensiformis. (Pag. 48.) 
A single individual of the natural size. 8 b. A portion of the same enlarged. 
A fragment of stone having several specimens upon the surface. 
Fig. 7. 
Fig. 8. 
(Pag. 46.) 
(Pag. 46.) 
. 1. 421. 1. Cannapora junciformis. (Pag- 43.) 
1 a. A portion of a hemispheric mass, showing the mode of growth. 
1 A A small fragment where the tubes are parallel. 
1 c. Showing the tubes surrounding and radiating from some foreign cylindrical body, upon which the polyps ' 
have grown. 
Id. Several tubes enlarged. 
1 e. Transverse section, showing the stellate orifices of the tubes. 
1 f. A similar section, where the cells are hollow'. 
.2. 422. 1. Catenipora escharoides. (Pag. 44.) 
