MADEEPOEA. 65 



The specimens in the Saville-Kent Collection which I have referred to this species have 

 the following characters : — 



Corallum bnshy or subcorymbose, reseinbling M. arbuscula in habit. Branches elon- 

 gate and relatively slender, bent, the divisions spreading, 1 cm. thick, often 8 cm. long, 

 and simple or with short spreading twigs and elongate corallites near the apex. Axial 

 corallites cylindrical, 27 to 3'5 mm. diameter, only slightly exsert; star 12-rayed, the septa 

 thin and the primary series subequal. Radial corallites stout, tubo-nariform, distant, 

 becoming gradually shorter, verruciform, and finally immersed. They extend at an angle 

 of about 45^ ; the average dimensions are — length 4 mm., diameter 2 mm. ; the apex is 

 convex, the wall thickened but porous, closely striato-echinulate on the surface, a few small 

 nariform corallites are scattered between the more prominent ones on some of the branches. 

 The longest corallites are situated near the apex of the branches, and give rise to new twigs ; 

 some, which are 7 mm. long, are tubular, with the inner part of the wall quite thin, many are 

 over 1 cm. long, and bear several buds on the outer surface. One specimen is subcorymbose, 

 30 cm. high and 46 cm. broad, with the branches much subdivided, and there is a consequent 

 scarcity of proliferous tubular corallites near the apices. The star of the radial corallites is 

 13-rayed, but in the prominent corallites of the distal divisions the second cycle is not yet 

 developed. 



Indo-Pacific Ocean : Fiji Islands, Great-Barrier Reef area, Amirante Islands, Seychelles. 



a-c. Port Denison. Saville-Kent Coll. 92. 6. 8. 225 to 227. 



d, e. Eagle Island, Amirante Islands, 10 fathoms. H.M.S. 'Alert.' 82. 10. 17. 134 & 142. 



/. African Island, Amirante Islands, 10 fathoms. H.M.S. 'Alert.' 82. 10. 17. 143. 



^, A. Seychelles. H.M.S. ' Alert.' 82. 10. 17. 144 & 157. 



i. ? ? 93. 4. 7. 154. 



47. Madrepora squarrosa. 



Heteropora squarrosa, Ehrenberg, Corallenth. d. roth. Moeres, p. 112. 



Heteropora forskali, Ehrenberg (part.), op. cit. p. 113. 



Madrepora squarrosa, Klunzinger, KoraUenth. d. roth. Meeres, Th. ii. p. 13, pi. ii. fig. 9, pi. iv. fig. 12, 



pi. ix. fig. 9. 

 ? Madrepora ramkidosa, Dana, Zoophytes, p. 463, pi. xxxv. fig. 4 ; Rathbun, Proc. U.S. Nat. Mus. 1887, 



vol. X. p. 18; Ortmann, Zool. JB. 1888, Bd. iii. p. 154 (non Quelch, ' Challenger ' Reef Corals, p. 159). 



Corallum low, arborescent, 8 to 10 cm. high and broad. Stem 1 to 1'5 cm. thick, with a 

 few much divided divergent branches 1 to 6 cm. long and 5 to 8 mm. thick. Some specimens 

 are more fruticose, with several stems arising from a broad plate-like base. Axial corallites 

 2 to 3 mm. diameter, wall rather thin, aperture up to 2 mm. Radial corallites small, thin- 

 walled, little spreading, 2 to 3 mm. long and 1'5 to 2 mm. broad, round nariform or a little 

 compressed, aperture 1*5 to 2 mm. long. Corallites quite at the apex 3 mm. long and only 

 1 mm. wide, only those about to form new buds are quite tubular, with a central aperture. 

 Those on the stouter branches are immersed or a little prominent; all are rather distant. 



