266 MADREPORARIA. 
P. Great Barrier Reef 36. A fragment of some form apparently built of irregular 
nodulated ridges. 
P. Great Barrier Reef 37, A fragment showing quite an unusual growth-form—a 
thick erect leaf, with wavy uneven lateral surfaces, an incipient lobe formation 
on the lateral edges, while the top edge tends to split longitudinally into two 
leaves or rows of lobes. 
P. Philippines 5. May be due to the regular thickening of encrusting 
P. China Sea 11 and 15. colonies. 
P. Singapore 6. Is a cluster of thinner, shorter ridges, with the same tendency to 
longitudinal splitting as described for the last form. 
P. Red Sea 2. Massive, convex, and humpy. 
P. Sandwich Islands 7, Massive, uneven, with rounded or oval knobs. 
P. Ceylon 5. With prominent, rounded lobes. 
P. Christmas Islands 1-4. Massive, of unknown shape. 
F. Oval or Pear-shaped, and Columnar. 
These include forms which assume the above-mentioned shapes by the expanding-sheaf 
method of growth. 
i. Oval and pear-shaped :— 
P. Society Islands 1. As lobate knobs from lateral attachment. 
P. Tonga Islands 4. As a pear-shaped knob enveloping a branch of a Madrepora, 
surface indented. 
P. New Guinea 2. As smooth, pear-shaped knobs on branch of coral. 
P. Banda Sea 1. A lobate mass, attached laterally. 
P. Timorlaut 1. A mass, attached laterally, and swelling horizontally. 
Cf. also P. Great Barrier Reef 20, An egg-shaped mass attached to seaweed. 
u, Columnar :— 
P. Tonga Islands 5.| As a swelling column, from small base, and tending to divide 
P. Tonga Islands 6. unequally. 
P. Fiji Islands 12. Stout, flat-topped column, with smooth sides. 
P. Solomon Islands 7. Round-topped, double columns of unequal size, divided down 
to the base. 
P. Solomon Islands 8, Flat-topped, double columns, divided unequally on one side 
only down to the base. : 
P. Sandwich Islands 3. Cluster of smooth columns, fused, but with tops as rounded 
lobes. 
P. Great Barrier Reef 2. Columnar mass, fluted, tops of flutings separated for short 
distances. 
P. Great Barrier Reef 25. Tall, slender column, with cluster of similar columns 
springing from flattened top. 
P. Great Barrier Reef 35. Apparently the top of a stout, irregularly lobate column. 
P. China Sea 16. Irregularly fluted mass, with slight divisions at the top. 
P. Ceylon 4. Appears as a single column in early stage ; old stocks may be a mass 
of lobes, each lobe suggesting in its form a repetition of the original single column. 
