84 MADEEPORAEIA, 



immersed corallites the directive septa may be well developed, the other primaries of moderate 

 breadth, and a more or less complete second cycle then occurs. Corallum very porous ; 

 surface reticulate and echinulate ; wall fenestrated, echinulate at the base. 



The type specimen was collected by Dr. Krauss on the coast of South Africa. The 

 locality is entered in the register as " Cape of Good Hope," but I think it probable that the 

 specimen came from the South-east Coast and not from Cape Colony. 



Southern part of the Indian Ocean, Ceylon, and ? Solomon Islands. 



a. South Africa. Dr. Krauss [C.]. 40. 9. 30. 9. (Type.) 



?A. Sta. Anna Isl., Solomon Islands. Dr. Guppy [P.]. 84. 12. 11. 28. (Young colony.) 

 c, d. Ceylon. Madras Museum. 90. 6. 28. 2 & 7. (Var.) 



74. Madrepora rosacea. 



Madrepora rosacea, Esper, Pflanzenth. Th. i. p. 115, Madr. pi. xv. fig. 2, ?3 & 4 ; Studer, MB. Akad. 

 Wiss. Berlin, 1878, p. 530 ; Quelch, ' Challenger' Eeef Corals, p. 157. 



Corallum cespitose, about 9 cm. high and 10 to 14 cm. broad, consisting of crowded 

 forked branches which are separated quite to the base. Distal divisions 3 to 35 cm. long 

 and 5 mm. diameter at the base, but more above, owing to the greater prominence of the 

 corallites. Axial corallites cylindrical, 2 mm. diameter, scarcely exsert ; the star consists of 

 6 septa only, the directives somewhat broader than the others. Radial corallites tubo- 

 nariform or tubular, the inner part of the wall absent at first and rarely as prominent as the 

 cater, excepting in such individuals as become converted into axial corallites and bear buds ; 

 length 3 to 5 mm., but some scarcely free, others with an elongate tip and often with 

 immersed or subimmersed cells between, diameter TS mm., angle 20° to 45° ; the star consists 

 of 6 septa, the directives often nearly meet, but the other four are quite narrow. Towards 

 the base of the branchlets nearly all the corallites become subimmersed and have an indistinct 

 star. Corallum dense ; surface coarsely granular ; wall finely striate and bluntly echinulate. 



East Indian Archipelago. 



a, b. Samboangan. H.M.S. ' Challenger.' 86. 12. 9. 288 & 232, 



c. Temate. H.M.S. 'Challenger.' 86. 12. 9. 408. 



75. Madrepora disticha. (Plate XXXIII. fig. D.) 



Corallum cespitose or subcorymbose, consisting of slender, crowded, and repeatedly- 

 forked branches from a common base ; height 9 cm., diameter 12 cm. Branches 7 cm. long 

 and 8 mm. diameter at the base ; distal divisions 2 to 3*8 cm. long, little divergent; diameter 

 6 mm. below, where the corallites are short, but more near the apex, which is often pro- 

 liferous; apices about 1'5 cm. apart. Axial corallites cylindrical, 2 to 2'5 mm. diameter and 

 often 3 mm. exsert. Radial corallites tubular, those near the apex of a branch are a little 

 spreading and unequal in size; some are distinctly compressed; length 2 to 3 mm., diameter 1 



