REPORT ON CORALS — EXPLANATION OF PLATES. 213 



Fig. 11. A system of pores from another part of the same specimen of Allopora nobilis. 

 Shallow grooves run from the central gastropore to the encircling clacty- 

 lopores, a cyclo-system being thus commenced. 



Fig. 12. Horizontal section through the foregoing group at a slight depth from the 

 surface to show the existence of styles in the pores of the dactylozooids. 



Fig. 13. Allopora profunda. The connecting grooves between the pores of the cyclo- 

 system are deeper. The system is regular, and the interval between the 

 dactylopores have all the appearance of septa. 



Fig. 14. Allopora miniata. (Copied from Pourtales, Deep-Sea Corals, pi. hi. fig. 1G.) 

 Here the styles of the dactylozooids are brush-like in form, just Hke those of 

 the gastrozooids. 



Fig. 15. Astylm subviridis. There are no styles present in either kind of pore. The 

 pseudoseptal system is complete. The open mouths of the tubular con- 

 tinuations of the dactylopores appear as a circlet of circular openings at the 

 bottoms of the wide pseudo-interseptal spaces. The gastropore has two 

 mouths, an upper circular and wider one, and a deeper constricted opening, 

 which is rendered horseshoe-shaped by the projecting tongue of calcareous 

 matter B. 



Fig. 16. Distichopora cocciiwa. The pores are entirely confined to the central lines of 

 the sides of the branches of the flabelliform coral. The pores here occur in 

 regular straight rows. The gastropores form a median row, and on each 

 side of this is a single row of dactylopores, the mouths of which are elongate 

 in form with their longer axes directed towards the gastropores. 



PLATE III. 



Section vertical to the external surface of the decalcified living lamina of Spora- 

 dopora dich otoma. 



The main mass is seen to be composed of a network of ramifying and freely 

 anastomosing canals. The canals are of larger diameter towards the base of the section, 

 where they are continuous with the body cavities of the zooids ; but in the most inferior 

 region they are again smaller, being here somewhat atrophied and effete. Towards the 

 outer surface of the coral the canals are of smaller diameter and enclose smaller 

 interspaces than the larger deeper canals. The interspaces throughout the meshwork are, 

 in the recent condition of the coral, filled b)- the calcareous ccenosteum. 



Lying in special cavities of the meshwork are seen a gastrozooid and two dactylo- 

 zooids in the retracted condition, together with two sets of male gonophores and three 

 nematophores. The calcareous style of the gastrozooid is introduced in order to show 

 the position which it occupies in the retracted condition of the zooid. 



