104 MADEEPOEAEIA. 



b. Corallum prostrate. Radial corallites nariform. 



95. Madrepora actileuB. 



Madrepora aculeus, Dana, Zoophytes, p. 450, pi. xxxii. fig. 6 ; M.-Edwards & Haime, Coralliaires, t. iii. 

 p. 155 ; ?Que]ch, ' ChaUeuger ' Eeef Corals, p. 160 ; Eathbun, Proc. U.S. Nat. Mus. 1887, vol. x. 

 p. 12 ; ?Bassett-Smith, Ann. Mag. N. H. 1890, vol. vi. p. 454 {nm Ortmann, Zool. JB. 1888, 

 Bd. 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, 4 mm. thick and often 5 cm. long, subacute. Axial corallites prominent (often 

 2 mm.) ; 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. 



? b. Tizard Bank, 8^ 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 l"7cm. 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 cm. 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). 



a. ? W. Thomson Coll. 91. 2. 3. 5. 



c. Corallum subcorymbose or frondose. Radial corallites open nariform or labellate, 



with a wide circular aperture. 



97. Madrepora surculosa. 



Madrepora surculosa, Dana, Zoophytes, p. 445, pi. 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 ; Queleh, 'Challenger' Eeef Corals, p. 166 ; Eathbun, Proc. U.S. Nat. Mus. 



1887, vol. X. p. 42 (»io» Studer, Mitth. naturf. Ges, Bern, 1880, p. 20). 



