SUPPLEMENTARY GONIOPOR^. 153 



160. Goniopora Great Barrier Reef (i5)14. {<!■ Qjcwuslandicc qudrludccima.) 

 (PL VIII. fig. 5.) 



[" Great Barrier Eeef," coll. W. Saville-Kent ; British Museum.] 



Description. — The corallum is smooth and massive, oval in outline, with both upper and 

 lovi^er surface somewhat flattened. 



The specimen had rolled over and was free. 



The calicles are shallow, concave depressions, varying slightly in depth and concavity, 

 and in size from 2 to 3 mm. The walls are the simple ridges between these concavities, for 

 the most part sharp, very granular, with traces here and there of a smooth zigzag thread, 

 sometimes, however, somewhat blunt, flat-topped and striated by faint septal ridges. The 

 full number of septa is developed, each being a long row of coarse, irregular granules, broad, 

 and sometimes appearing doubled near the wall, but tapering away to minute single granules 

 near the centre. The formula is obscure owing to the regularity of these radial structures, but 

 can be made out by close observation. The typical rosette of pali can also be made out witli 

 a central tubercle in line with the directive septa. 



The colour of the unbleached coral is a dark sepia. 



The individual specimen seems to have been hollowed out from the base of attachment 

 upwards till a breach was made in the upper surface. This breach was covered over by fresh 

 coral. The stock then seems to have rolled quite over and become free. The living layer has 

 grown up covering the old base of attachment and dipping down into the hollow in the old 

 stock. 



An extreme example of a Goniopora vrith long, straight septa, the edges of which are so 

 granulated as to appear double at their thicker periplieral ends, is figured in Vol. IV. PI. X 

 fig. 1, which is from a specimen of the classical Astrcea hellula of Michelin, re-discovered in 

 the British Museum (see Vol. IV. p, 133). The character is rare. 



a. Zool. Dept. 1905. 9. 21. 1. 



161. Goniopora Great Barrier Eeef (i5)15. {G. Qticcnslandiw quintadccima.) 

 (PI. VIII. fig. 6.) 



[Thursilay Island, coll. Pace ; British Museum.] 



Description.- -The corallum is small, round or oval, cushion-shaped, of varying convexity 

 and creeping iiTegularly over a substratum of shells and other organic remains, or over earlier 

 colonies. 



The calicles are polygonal, from 2 mm. in diameter to nearly 4 mm. (in the more convex 

 colonies), and from 1 • 5 mm. deep in the less convex colonies, to 4 mm. in the more convex 

 colonies. The wall is steep, thin and lattice-like, but appears to be thickened by regular, 

 vertical, septal stritB. The top edges are without distinct zigzag or median line, and are 



X 



