104 MADREPORARIA. 
b. Corallum prostrate. Radial corallites nariform. 
95. Madrepora aculeus. 
Madrepora aculeus, Dana, Zoophytes, p. 450, pl. xxxii. fig. 6 ; M.-Edwards & Haime, Coralliaires, t. iii. 
p- 155; ? Quelch, ‘Challenger’ Reef Corals, p. 160; Rathbun, Proc. U.S. Nat. Mus. 1887, vol. x. 
p- 12; ? Bassett-Smith, Ann. Mag. N. H. 1890, vol. vi. p. 454 (non Ortmann, Zool. JB. 1888, 
Ba. iii. p. 153). 
Corallum prostrate ; branches stout and very uneven, much and closely subdivided. 
Branchlets on the under surface short, angular, horizontal, and covered with long tubular 
corallites. On the upper surface the branchlets are exsert, but rise with a curve, very 
crowded, 4mm. thick and often 5 cm. long, subacute. Axial corallites promment (often 
2mm.) ; radial corallites not crowded, small, round nariform, with the edge thin, 1 mm. 
diameter and 2 mm. long; wall striate, but not echinulate. Star mostly distinct, the 
directive septa broadest. (Dana.) 
Indo-Pacific Ocean: Fiji, ? Philippines, ? China Sea. 
?a. Samboangan, Philippines. H.M.S. ‘Challenger.’ 86. 12. 9. 249. 
? 6. Tizard Bank, 834 fathoms. H.M.S. ‘Rambler.’ 89. 9. 24. 105. 
96. Madrepora glochiclados. 
Madrepora aculeus, Ortmann (non Dana), Zool. JB. 1888, Bd. iii. p. 153. 
Corallum prostrate, resembling M. aculeus in habit, but provided with stouter branchlets 
and much larger radial corallites. The type specimen consists of a mass of branches 36 cm. 
long, the main divisions 1°7 cm. thick. The branchlets on the upper surface are arched, 8 cm. 
long, simple or divided near the base into 2 or 3 little-spreading divisions about 1 em. thick. 
Axial corallites 2°5 to 3 mm. diameter, 1 to 2 mm. exsert. Radial corallites broad nariform, 
more or less spreading, 2°5 and occasionally 3 mm. diameter, 3 to 4 mm. long, but becoming 
shorter and subimmersed below. The star consists of 12 well-developed septa. Corallum 
moderately porous near the apex, but stony below; surface and wall striate and echinulate. 
Indian Ocean (Strassburg Museum). 
? W. Thomson Coll. Q1. 2. 3. 5. 
ec. Corallum subcorymbose or frondose. Radial corallites open nariform or labellate, 
with a wide circular aperture. 
97. Madrepora surculosa. 
Madrepora surculosa, Dana, Zoophytes, p. 445, pl. xxxii. figs. 4 & 5; M.-Edwards & Haime, Coralliaires, 
p. 158; Verrill, Bull. Mus. Comp. Zool. 1864, vol. i. p. 42; Duncan, Journ. Linn. Soc. Lond. 
1886, vol. xxi. p. 19; Quelch, ‘Challenger’ Reef Corals, p. 166; Rathbun, Proc. U.S. Nat. Mus. 
1887, vol. x. p. 42 (non Studer, Mitth. naturf. Ges. Bern, 1880, p. 20). 
