212 MADREPORARIA. 
septa and columellar tangle, being very thin, the interspaces—interseptal loculi, etc.—are all 
large and open. 
The section shows a streaming of stout lamellate trabecule with large oval pores in 
vertical series. 
There is only one round disc-shaped specimen which has been sawn off a larger mass, 
leaving no certain trace as to whether the original was globular with flattened top, or thick and 
cake-like. The lamellate trabeculee showing at the surface in the membranous walls suggest 
the former as its growth-form. 
For Mr. Ridley’s identification of it with Quoy and Gaimard’s specimen from Vanikoro, 
compare description of that coral, p. 82. 
a. Zool. Dept. 82. 7. 31. 10. 
215. Porites Ceylon (9919. (P. Ceylonica nonadecima.) 
[Shore reefs near Galle and Belligam, coll. Ernst Haeckel; Museum Zool. Inst., Jena. } 
Syn. “ Synarea convera Verrill” Ortmann, Zool. Jahrb. iv. (Syst.) (1889) p. 500. 
Description.—The corallum is regularly hemispherical, consisting of numbers of upright, 
angular, and coalescing branches. The branches do not fuse so completely as to make the 
coral a solid mass internally. 
The calicles are crowded, small, and shallow. The pali are short, thick, and blunt. 
Dr. Ortmann found some of the specimens slightly different from S. convexa and more 
like the S. solida of Verrill, in the thickness and length (1°2 cm.) of the free twigs projecting 
at the surface. At the same time he noted that Verrill’s S. convewxa, solida, and irregularis 
were only variations of the same coral (see P. Society Islands 3). None of the Ceylon forms in 
the National Collection are cenenchymatous. 
216. Porites Ceylon (29:20. (P. Ceylonica vicesima.) 
[Shore reefs near Galle and Belligam, coll. Ernst Haeckel; Museum Zool. Inst., Jena.] 
Syn. “ Porites lutea” Ortmann, Zool. Jahrb. iv. (Syst.) (1889) p. 501. 
Description.—The corallum is massive, convex, and humpy. 
The calicles are 1 mm. in diameter and more; the walls are thin; the pali are visible; 
the columella obscured. 
Dr. Ortmann refers also to Dana’s figure (Zooph. pl. lv. fig. 3) and Dr. Klunzinger’s 
figure (Die Korallthiere des Rothen Meeres ii. pl. v. fig. 16), but neither of these seem to me 
to be the same as the coral from Tongatabu, called “ P. lutea” by Milne-Edwards and Haime ; 
for a description of it see P. Tonga Islands 1, p. 34. 
