284 
Iz. 
1. 
JP. 
Ie. 
MADREPORARIA. 
Fiji Islands 21, The same, only with minute calicles. 
Fiji Islands 22. On the upper surface only ; on lower, the septal granules 
appear in the dense mosaic of the flat walls. 
Ellice Islands 13. With walls thin, membranous, and slightly zig-zag ; 
scattered septal trabecule at times involved in the wall (as in 3, iv.). 
Solomon Islands 5, With thin, thread-like walls, and only scattered septal 
trabecule close to wall; in the angles of calicles they form portions of an 
inner wall (as in 3, i.). 
. Great Barrier Reef 4. The septal granules when present seem only to 
roughen the inner faces of the raised walls ; see also 8, iii. 
. Great Barrer Reef 5. The wall trabecule are long, stout, smooth rods ; 
septal and palic trabecule irregular and scanty. (N.B.—This form shows 
the greatest reduction so far known in the genus in the number of the 
intra-calicular trabecule.) 
. Great Barrier Reef 6. With walls very irregular, seldom reticular; septal 
trabeculz only in traces. 
. Great Barrier Reef 7, With septal trabeculze either absent or involved in 
the wall, which is composed of stout, smooth trabecule in confused single 
or double rows, seldom forming a reticulum, but showing traces of a zig-zag 
arrangement. 
. Great Barrier Reef 40, With mostly very narrow, irregularly flaky walls, 
with only scattered septal trabecule. 
. North Australia 5. With tall, stout, but quite irregular walls, as if of tiers 
of thick flakes; trabecule obscured. 
. North-West Australia 2. With the septal trabecule involved in an open, 
straggling, very irregular wall, showing a tendency to be flaky. 
. North-West Australia 8. With walls thin, here and there reticular—that is, 
with a few septal trabecule involved. 
. Banda Sea 2, Only on the tips of the branches; the walls of the lower 
parts are too flaky to allow the trabeculze to be distinguished. 
y] 
. Singapore 2. With the septal trabecule aborted or confused in thin, 
straggling walls, 
. Christmas Island 1. Belongs here, when the walls are thin, but to 3, iv. 
when they are reticular. 
Ceylon 13. With septal trabeculee confused in the zig-zag walls. 
. Diego Garcia 1, With walls very tall and thin, the septal trabecule either 
wanting or forming a very thin reticulum close to wall and very deep 
down. Skeleton open. 
. Cape of Good Hope 1, With septal trabecule apparently confused with the 
thin zig-zag walls (? also 6, iii.). 
Observations on Tables B and C.—A glance at these tables, beginning as they do with the 
largest calicles known in Porites, in which the extra trabecule function as the middle line 
between adjacent calicles, shows a progressive diminution down to the last sub-division, 
C, 6, v., in which it is possible almost to regard the septal trabeculee as forming the median 
line. In the former case 3 rings of trabecule are incorporated in the intra-calicular skeleton, 
