DISTRIBUTION OF GROWTH-FORMS. 173 



Doubtful :— 

 G. Cliina Sea 5. If this belongs here, the explanate phase is more completely 

 obscured than in G. Great Barrier Beef 12. 



F. Massive. 



Massive forms result from the young colony thickening more rapidly than its base 

 expands, and we get forms which are (a) regular, namely regularly rounded and regularly 

 oval ; (&) irregular, namely irregularly lobate and pulvinate. 



(a) Regularly massive : — 



Bounded, mostly flat topped, produced by continuous regular thickening of the stock, 

 its width being equal to or greater than the height ; edges closely encrusting. 

 G. New Guinea 1. Called hemispherical, but with narrow base. 

 G. Solomon Islands 2. 

 G. Solomon Islands 3. 

 G. Queen Charlotte Islands 1. 

 G. Great Barrier Beef 7. 

 G. Great Barrier Beef 10. 

 G. North- West Australia 1. 

 G. Celebes 1. 

 G. Philippines 2. 

 Goniopora xd. 

 Goniopora xe. 



Doubtful :— 

 G. Solomon Islands 4- 

 G. North- West Australia 5. 

 G. China Sea 4- 

 G. Koritzan 1. 

 G. Koritzan 2. 

 G. Bilin 1. 

 G. Paris Basin 5. 

 G. Paris Basin 6. 

 G. Paris Basin 9. 

 G. Sussex 1. 



Oval, produced by regular continuous growth, but the height is greater than the 

 width ; it differs apparently from the expanding sheaf growth in not being due to 

 rapid growth of the walls and septa. Rare. 



G. Philippines I . 

 Goniopora xf. 



Doubtful :— 

 G. Persia If.. 



G. Great Barrier Beef 3. May belong to the expanding sheaf formation. 

 Goniopora x g. 



