MADREPORA. 151 
2 em. diameter at the base ; under surface oblique and solid. Axial corallites 3 to 3°5 mm. 
diameter. Radial corallites as in typical M. pyramidalis. 
Indo-Pacific Ocean: Red Sea, Mauritius, Mergui Archipelago, Pelew and Caroline 
Islands, China Sea, Great-Barrier Reef. 
a. Port Denison. Saville-Kent Coll. 92. 6.8. 145. 
Var. depressa. 
a, 6. Tizard Bank, 2 fath. H.M.S. ‘Rambler.’ 89. 9. 24. 99 & 166. 
Var. corymbiformis. 
a ? ——? 93.4. 7. 110. 
158. Madrepora canaliculata. 
Madrepora canaliculata, Klunzinger, Korallenth. d. roth. Meeres, Th. ii. p. 12, pl. i. fig. 3, pl. iv. fig. 10, 
pl. ix. fig. 8. 
Corallum cespitose, similar to that of WZ. seriata ; apical branchlets rarely over 1 cm. in 
diameter. Axial corallites thick and hemispherical, 4 to 5 mm. diameter. Radial corallites 
crowded and appressed near the apex, but not dilated. The majority are very unequal ; many 
are 3 to 4 mm. long and 2 mm. diameter, obliquely ascending, tubular, with a more or less 
deep longitudinal fissure in the inner side, wall not much thickened; others are similar in 
form but shorter, with spoon-shaped, round nariform, uncinate and immersed ones intermixed. 
Near the base of the branches the corallites become verruciform and immersed. Corallum 
porous; surface spongy-echinulate ; wall striate. 
A specimen in the Saville-Kent Collection has the branches 8 to 9 em. long and 1°5 cm. 
diameter at the base; apices about 2°5 cm. apart. Axial corallites 3°5 mm. diameter. Radial 
corallites spreading almost at right angles, gutter-shaped, half-tubular or obliquely tubular 
with shorter ones between ; a few become stouter and verruciform below, with immersed cells 
between ; length of the more prominent corallites 83 mm., diameter 2°3 mm., margin plane. 
Septa narrow, especially in the immersed corallites; second cycle often incomplete ; the 
directives usually rather broader than the other primaries. 
Indo-Pacific Ocean: Red Sea, Great-Barrier Reef. 
a. Port Denison. Saville-Kent Coll. 92.6.8. 200. 
159. Madrepora bullata, (Plate XIII. fig. D.) 
Madrepora bullata, Brook, Ann. Mag. N. H. 1892, vol. x. p. 454. 
Corallum cespitose from an incrusting base; diameter 27 cm., height 11 cm., diameter 
of base 11 cm. Branches digitiform, erect in the centre, spreading towards the margin; 
central branches 5 to 6 em. long and about 1°7 cm. diameter at the base, gradually tapering 
to a blunt apex, simple or forked, with numerous elongate proliferous corallites and short 
twigs; apices of the main divisions about 3°5 cm. apart, marginal branches on one side 
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