MADREPORA. 151 



2 cm. 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, b. 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, pi. i. fig. 3, pi. It. fig. 10, 

 pi. ix. fig. 8. 



CoraUum cespitose, similar to that of ilf. 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 nariformj 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 3 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 cm. 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 



x2 



