GONIOPORA. 157 



146. Goniopora x a. (PI. VIII. fig. 4.) 



This being very like the specimen G. Java Sea 1, has already been described under that 

 heading. For the known distribution of its growth-form and type of calicle see Table III. B. 

 p. 170 and Table IV. B. (b). /3. p. 179. Zool. Dept. 51. 11. 14. 88. 



147. Goniopora xb. (PI. VIII. fig. 8; PI. XIV. fig. 1.) 



This is a worn pebble-shaped fragment, but appears in essentials of structure to be so like 

 a Red Sea form, that it has been already sufficiently described, see G. Bed Sea 4, P- 103. I 

 know of no other recent Goniopora with such remarkable skeletal structure, and the 

 probability is therefore very great that this came from the shores of that sea. 



Zool. Dept. 1902. 9. 9. 15. 



148. Goniopora xc. (PI. IX. figs. 1 and 2 ; PI. XIV. fig. 2.) 



Description. — Corallum forms heavy masses, with smooth rounded tops and vertical or 

 only slightly bulging sides. The mass is divided irregularly by deep perpendicular fissures 

 about 1 cm. in width, and often cutting in laterally for a certain distance and not completely 

 dividing the surface. The living layer extends some 9-10 cm. down the outside of the coral, 

 but much less in the fissures. 



Calicles small, average 2 mm. ; 2-3 mm. deep, all over the top, 1 mm. or less at the 

 sides. Immense numbers of young calicles opening on the top, with an intracalicular 

 skeleton filling them to the top of their walls. They are thus in great contrast with the deep 

 calicles all around them. Walls thin, except where young calicles are developing; mostly a 

 single thin zigzag with one side sometimes thickened to an angular reticulum, built up of glassy 

 threads. These run out into septal points, which on the top of the stock may be like rows 

 of sharp hairs. They are short and wavy, and the radial arrangement is not very symmetrical. 

 The typical formula is probably developed, but the septa are too short and lost too soon in the 

 large columellar tangle to be easily made out. The tertiaries bend round very conspicuously 

 to fuse with the secondaries at an angle of 45° or more, and enclose a space smaller but 

 almost as conspicuous as the other large rounded interseptal loculi. The columellar tangle is 

 built of very irregular glassy flakes. In the shallow young calicles it is usually a single ring 

 uniting the secondary septa, with small pali rising from the points of union. 



In the lateral calicles the skeleton is thicker, the walls more solidly reticular, and the 

 short thicker septa early join the large columellar tangle, which may be a mere convex mass 

 of open flaky reticulum, or flat with conspicuous paliform granules. In vertical sections the 

 walls are seen to become thick and solid, the septa like short bars rather close together, and 



