ANALYSIS AND DISTRIBUTION OF TYPES OF CALICLES, 279 
ii. The septal trabecule may be united to the wall trabeculz by broad, flaky, 
tongue-like septa, representing great development of the horizontal 
elements of the skeleton. 
iii. The septal trabeculee are arranged very close to the wall, which then rises 
iV. 
Vie 
like a sharp ridge, being slowly thickened on each side by an irregular 
reticular buttress composed of the septal trabeculz and their junctions. 
The septal trabecule may rise up high, and form, with the wall trabecule, a 
reticular wall without median ridge. The pali are then the only free and 
distinct ring within the calicle. 
The septal trabecule are partially aborted, and the diminution of the calicle 
has reached its limit, except in such extremes as P. Great Barrier Reef 4, 
in which the pali also suffer diminution. 
a, Walls single with two clear rings of septal and palic trabecule. 
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IP 
cP 
Tonga Islands 4. With walls thin and membranous ; calicles here and there 
very small, and then belonging to sub-division @, v. 
Sandwich Islands 7. With walls here high, thin, and membranous, there 
zig-zag and low. 
Great Barrier Reef 8. With walls slightly raised, sometimes zig-zag and 
thickened ; the granules or tips of trabecule tend to be rectangular, and are 
finely echinulate. 
. Great Barrier Reef 14. The septal trabeculee are clear when the wall is thin 
and zig-zag, but when the walls thicken, they become involved in the 
reticulum. 
. Great Barrier Reef 20. With walls membranous, and septal trabecule as 
lamellate plates projecting inwards and upwards. 
. Great Barrier Reef 25. With tendency to form an inner wall. See 4, i. 
. Great Barrier Reef 30. With walls and internal skeleton all thin, straggling, 
and lamellate ; calicles large. 
. Great Barrier Reef 31, With calicles very small; where the walls thicken 
the septal trabeculee become involved. 
. Great Barrier Reef 35. With walls thin, incomplete, and zig-zag; the 
trabecule pronounced, and horizontal elements feeble. 
. North-West Australia 4. On the top, but down the sides the calicles pass 
through stages 0, iii. and 0, iv. 
. Philippines 3. On the top belonging to B with three inner rings, but at the 
sides two rings alone distinct, but the relations are often obscure. 
. Chinu Sea 11, The surface view of the granules shows two clear rings 
within polygonal walls, but variable, here as in 2, ili., there as in 8, iv. 
b. Wall and septal trabecule variously associated. 
i. The 
1 
septal trabecule form a regular inner wall or shelf. (The “trimurate” 
condition. ) 
Fiji Islands 2. With the septal trabecule variously united, sometimes as a 
smooth shelf, sometimes as a regular network. 
