MADREPORA. 147 
k. Thursday Island. Saville-Kent Coll. 92. 6. 8. 122. 
1. Rocky Island. Saville-Kent Coll. 92. 6. 8. 277. 
Var. uncinata. 
a, b. Singapore. Mus. Comp. Zool. Harvard Coll. 91. 6. 16. 
1 & 2. 
c. Wreck Bay, Great-Barrier Reef. J. B. Jukes, Esq. [P.]. 46. 7. 30. 26. 
?d. Tizard Bank. H.M.S. ‘Rambler.’ 89. 9. 24. 100. 
(=M. scabrosa, B.-Sm.) 
151. Madrepora ortmanni. 
Madrepora crassa, Ortmann (non Edwards & Haime), Zool. JB. 1888, Bd. iii. p. 149. 
Corallum subarborescent, the divisions very stout. Branches 10 cm. long and 3 em. 
thick, bearing 4 or 5 thick digitiform branchlets nearly 2 cm. thick ; in certain cases, owing 
apparently to the fusion of two branches, they form oval spreading lobes 8 em. long, 3°5 cm. 
broad, and 2 cm. thick, the apex oval, 2 cm. by 1 cm., with 2 axial corallites separated by 
others of the radial type. Here, as in M. brueggemanni, there is, in certain branches, an 
approach to the condition of the subgenus Jsopora. Axial corallites 4 mm. diameter, little 
exsert ; wall rounded, witha large aperture (2 mm.) and deep-seated star of 12 septa. Radial 
corallites long, appressed, tubular, crowded, and markedly imbricate, but in some parts more 
spreading and irregular; diameter 2°5 to 3 mm., length up to 6 mm., or even more; wall 
moderately thick, aperture large, margin rounded. The star consists of 6 well-developed 
septa, and of a more or less complete second cycle. Corallum dense, but still reticulate in 
section ; surface reticulate, with a spongy film in places; wall finely echinulate, not striate, 
echinulations longer near the base of the corallites. 
Pacific Ocean : Ponapé and Bowen, Queensland (Strassburg Museum). 
152. Madrepora acervata. 
Madrepora acervata, Dana (non Verrill), Zoophytes, p. 460, pl. xxxiv. fig. 4; M.-Edwards & Haime, 
Coralliaires, t. ii. p. 154; Rathbun, Proc. U.S. Nat. Mus. 1887, vol. x. p. 12 (non Studer, 
Mitth. naturf. Ges. Bern, 1880, p. 22; non B.-Smith, Ann. Mag. N. H. 1890, vol. vi. p. 454). 
Madrepora plantaginea, Verrill (non Lamarck, non Dana), Bull. Mus. Comp. Zool. 1864, vol. i. p. 42; 
ibid. Appendix, 1875 ed. of Dana’s Corals & Coral Islands, p. 333. 
Corallum broad, cespitose, a little convex above ; exterior branches nearly prostrate and 
somewhat flattened below. Branchlets 5 cm. long and 1 to 16 em. thick, very proliferous, 
often acute at the apex and subretuse. Axial corallites broad, 3 to 4 mm., scarcely exsert ; 
aperture scarcely one-fourth the diameter. Radial corallites crowded, appressed, tubiform, 
2 to 3 mm. long; wall distinctly striated, oblique at the apex; lip thick; aperture elliptical; 
star very distinct, the directive septa nearly meet below. (Dana.) 
Singapore. 
