PLATE 18. 



Fig. 1. 421. 1. Cannapora jtJNCiFORMis. (Pag. 43) 



1 a. A portion of a lieniispheiic mass, sliowing tlic mode of growth. 



1 i. A small fragment wliere the tubes are parallel. 



1 c. Showhig the tubes surrounding and radiating from some foreign cylindrieal body, upon wliich the polyp.s 



have grown. 

 1 d. Several tubes enlarged. 



1 e. Transverse section, showing (ho stellate orilices of the tubes. 

 1 /. A similar section, where the cells are hollow. 



Fiir. 2. 422. 1. Cate.n-ipora eschakoides. (Pag. 44.) 



Fig. 3. 423. 1. Helopoea FRASiLis. (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 stipe and branch both having enlarged extremities. 



3 d. The specimen 3 b enlarged. 3 c. A portion of another specimen enlarged. 



3 /. A small specimen of limestone with fragments of this coral upon its surface. 



Fig. 4. 424. 7. Stictopora crassa. (Pag. 4.5.) 



4 a & It. Two fr.igmeiits, natural size. 



4 c. A portion enlarged, showing tlio striated siutace of the inteicellnl.ir spaces. 



Fig. 5. 42-5. 8. Stictopora raritora. (Pag. 46.) 



5 a, A. Two specimens of this ^ecies. -5 c. A portion enlarged. 



Fig. 6. 426. 1. Ph.s:nopoka explanata. ( Pag. 46.) 



6 «. A small unworn fragment, of the natural size. 



6 6 §■ d. A similar f\-agment, with the surface somewha^abraded. 



6 e. A portion enlarged. 



Fig. 7. 427. 2. Ph^nopora constellata. (Pag. 47. ) 



7 o. A portion of a large specimen, showing the entire width of tlie stipe. The spocinieii shows only the 



bases of the cellules, the upper portion with tlic centre liaving been broken .iway. 

 7 b. A fragment presenting casts of the cellules, the calcareous matter being r«raoved. 

 7 c, A surfitce showing the bases of the cellules at their origin. 

 7 d. A portion of 7 a enlarged. 



7 «. A portion of surface of 7 6 enlarged. 



Fig. 8. 42S. 3. Ph^nopora KNsiroRMis. (Pag. 48.) 



8 o. A single individual of the natural si«e. 8 6. A portion of the same enlarged. 

 8 c. .4. fragnjcnt oi stone having several specimens upon the surface. 



