MADREPORARIA WHITELEGGE. 361 



The echinulations are more closely packed than in any of the 

 described species known to me. The following measurements 

 of the eehinulations on the younger parts of the corallum and on 

 the corallite walls have been taken from specimens in the Museum 

 collection : 



Height of echinulse. Distance apart. 



M.hispida 0-2 mm (H8 mm. 



M.plicata (H7 0-13 



M.palifera (H7 ... ... 0-12 



M. cuneata 0'15,, (H5 



M. impressa ... 0-15 O'l 



ASTR.EOPORA INCRUSTANS, Bernard. 



Astrceopora incrustans, Bernard, Cat. Madr. Corals, Brit. Mus., 

 ii., p. 89, pi. xxvii., pi. xxxiii., fig. 10. 



A fine example of this species is in the collection. 



The corallum forms a slightly convex plate, 17 cm. broad, 20 

 cm. long, and from 1 to 2 cm. in thickness. 



Outline irregularly elliptic, margin pendant on one side obscur- 

 ing the epitheca, on the other subhorizontal, the epitheca being 

 radiately scalloped and concentrically ridged. The calicles are 

 separated by spaces about 3 mm. wide. The walls are low, inclined 

 in various directions, one side often flush with the surface, the 

 other more or less elevated ; diameter of the aperture usually 

 about 2-5 mm., rarely 3 '5. 



Interclated young and marginal calicles smaller, varying from 

 1 to 1*5 mm. 



Septa in two cycles, with an incomplete third, usually percept- 

 able at the margin, but very narrow. The primaries rapidly widen 

 out towards the base of the fossa. 



Surface porous and echinulate ; the echinulse are fla denticles 

 about 0'5 apart at the apex. 



ASTRCEOPORA OCELLATA, Bernard. 



Astrceopora ocellata, Bernard, Cat. Madr. Corals, Brit. Mus., ii., 

 p. 95, pi. xxix., pi. xxxiii., fig. 16. 



There are two fine examples of this species ; both are pulvinate 

 and attached to dead specimens of the same form. 



The larger corallum is 12 cm. broad, 23 cm. long, and about 

 10 cm. in thickness. 



The submarginal calices are large, prominent, with solid sloping 

 walls and regular radiating rows of plate-like echinulse, tipped 



