DISTRIBUTION OF GROWTH-FORMS. 259 
a. Purely encrusting, that is, without free edges. With reference to these it must be 
remembered that if small they may be only young stages of some of the more specialised stocks, 
and if large they may still rise up at any point into branchings or lobes, either spontaneously 
or where specially stimulated by the environment—and would then belong to division C. 
P. Fiji Islands 3. 
P. Fiji Islands 23. 
P. Ellice Islands 2. 
P. China Sea 6. 
P. China Sea 7. 
Doubtful forms.—In addition to the uncertainties mentioned above, another frequent 
cause of doubt lies in the fact that it is not always easy to say whether what 
appears to be an encrusting expanding colony is not in reality merely a patch 
surviving on the top of a dying massive form. 
P. Tonga Islands 2. As a small cap on a solid mass. 
P. Fiji Islands 18. May be a young stage. 
P. Sandwich Islands 8. Seems to envelop small objects; repeated layers build up 
rounded nodules. 
P. North-West Australia 1. Appears as a loose crust, but may be a massive form 
with a boring sponge continually destroying the coral just below the living 
layer. 
P. Moluccas 1. 
P. Philippines 5. An irregular conical mass. (See list E, c.) 
P. China Sea 11. May build up massive forms. (See list E, c.) 
P. China Sea 15, A massive lobate ridge. (See list E, c.) 
b. Explanate, with edges growing out freely from some central or lateral attachment, and 
supported by epitheca. 
P. Ellice Islands 1, Very thin. 
P. Fiji Islands 16. With edges turning up. 
P. Laysan 3. With edges turning up, surface smooth. 
P. Sandwich Islands 6. The whole stock crumpled, surface consequently uneven. 
P. Great Barrier Reef 1. A fragment; surface smooth, wavy, lobate, edges turning 
up. 
P. Philippines 6. Carried on the back of a Gastropod. Surface smooth. 
P. China Sea 3. Very thin, with surface uneven owing to the presence of round- 
topped ccenenchymatous papille. 
P. China Sea 4. A flat disc, with smooth surface. 
P. China Sea 5. A fragment, with uneven surface. 
P. China Sea 13. Surface warty, owing to the bulging up of small groups of 
calicles. 
P. China Sea 14. Appears to be a young stage with free edges; large massive stocks 
occur, apparently built up by close incrustations of this same coral. 
P. Mauritius 1, Thin, wavy; attached by central stalk. 
21 2 
