280 
Ps 
iP 
MADREPORARIA. 
. Ellice Islands 6. The wall trabecule as continuous, straggling, median lines, 
on the same level with the septal granules. 
. Ellice Islands 7. The same. 
. Ellice Islands 11, The same, only obscured by frosting of the otherwise thin 
skeletal elements. 
. Solomon Islands 7, A stout, open, smooth skeleton ; the septal trabecule are 
either as here or as under 3, iv., or, again, quite irregular. 
. Sandwich Islands 8. Typical. 
. Great Barrier Reef 22. The wall narrow, straight, and echinulate; inner 
wall fairly uniform, but not very pronounced. 
. Great Barrier Reef 25, In parts only. (See also C, a.) 
. Great Barrier Reef 33. The median ridge may be a distinct, delicate, zig-zag 
thread, on each side of which the septal trabecule unite into regular rings. 
. Singapore 5. With thread-like, echinulate walls, and very wide, straggling, 
flaky shelf, from the edges of which echinulate septal granules project ; 
here and there these latter divide into two, suggesting the group B, a. 
Ceylon 1. A fluent reticulum, often with three concentric lines in the walls, 
and apparently belonging to B, i.; comparison with P. Ceylon 2, however, 
shows it to belong here. 
. Ceylon 2. With much smaller calicles than No. 1. 
. Ceylon 3. Cf. P. Ceylon 7. 
. Ceylon 10. The skeleton a light, open network, with walls thin and raised, 
with regular synapticular ring. 
. Ceylon 16. With traces of a skeletal ring visible in the otherwise fluent 
network. 
Maldives 1. Walls excessively thin and membranous, here showing traces 
of inner ring, there as in 3, iv. 
P. Diego Garcia 2. With walls thin and raised, with scattered echinule ; inner 
ring pronounced. 
b, ii. The septal trabecule joined to the wall trabecule by broad, flaky septa, representing 
great development of the horizontal layer. 
P, Fiji Islands 3. The septal granules as small, woolly knobs. 
P. Fiji Islands 6. Wall and septal granules confused on the apparently convex 
surfaces of the septal flakes. 
P. Fiji Islands 19, With wall tall and irregularly thickened by many tiers of 
short flakes; the septal trabecule appear at irregular levels, and the pali 
deep down. 
P. Ellice Islands 4. Flat, flaky walls, with straggling wall granules, and septal 
I 
P. 
eranules at the tips of upper flakes, and the pali on the tips of lower; 
calicles minute. 
treat Barrier Reef 3, The wall flakes large, the tips of trabecule minute 
and far apart. 
. Great Barrier Reef 11, With flakes bold and large, the tips of the trabecule 
hardly visible, except those of the wall and pali. 
P. Great Barrier Reef 17. With very confused lines of bushy granules on the 
median ridges of the flaky walls. 
