MADREPORA. 65 
The specimens in the Saville-Kent Collection which I have referred to this species have 
the following characters :— 
Corallum bushy or subcorymbose, resembling 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, 2:7 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 thm, many are 
over 1 cm. long, and bear several buds on the outer surface, One specimen is subcorymbose, 
30 em. high and 46 em. 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 
12-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. 
f. African Island, Amirante Islands, 10 fathoms. H.M.S. ‘Alert.’ 82. 10. 17. 143. 
go h. Seychelles. H.M.S. ‘ Alert.? 82. 10. 17. 144& 157. 
a ? —? 93. 4. 7. 154. 
47, Madrepora squarrosa. 
Heteropora squarrosa, Ehrenberg, Corallenth. d. roth. Meeres, p. 112. 
Heteropora forskali, Ehrenberg (part.), op. cit. p. 118. 
Madrepora squarrosa, Klunzinger, Korallenth. d. roth. Meeres, Th. ii. p. 13, pl. il. fig. 9, pl. iv. fig. 12, 
pl. ix. fig. 9. 
? Madrepora ramiculosa, Dana, Zoophytes, p. 463, pl. xxxy. 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 em. 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 to2 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. 
