158 MADREPORARIA. 
d-j. Red Sea? Purchased. 40.5.7. 27 to 29,31 to 33 & 8 
k,l. Wreck Bay, Great-Barrier Reef. J. B. Jukes, Esq. [P.]. 46.7. 30. 7 & 35. 
m. Maldive Islands. Purchased. 86. 11. 22. 9. 
167. Madrepora guppyi. (Plate XXIII. fig. D.) 
Madrepora guppyi, Brook, Ann. Mag. N. H. 1892, vol. x. p. 458. 
Corallum broad, flattened, cespitose ; base 17 cm. diameter, height about 7 cm. ; marginal 
branches subhorizontal, rather small and crowded; the others simple or subsimple, conical, 
the central ones erect, those nearer the margin radiating ; apices rather far apart, often 4 cm. 
or more; diameter 2 to 2:5 cm. near the base, length 4 to 6°5 em., regularly tapering to a 
blunt apex. Axial corallites 3°5 to 5 mm. diameter, hemispherical or scarcely exsert. Radial 
corallites small, very crowded and spreading, regular, subequal and usually thin-walled, 
frequently a little compressed, half-tubiform with a rounded apex, or gutter-shaped, or a few 
with curved lower wall are eymbiform ; length 1:5 to 2 mm., diameter 1:2 to 1°5 mm.; those 
situated near the apex of a branch are shortest, those below gradually become longer and 
stouter ; a variable number of immersed corallites are scattered between the others; near the 
base of some of the branches the corallites are thickened and may be 2 mm. diameter. The 
apex of a branch in several cases forms the habitation of a Cirripede. Star not well developed 
in the radial corallites, often only the directive septa are recognizable, in the immersed 
corallites even these are extremely narrow. Corallum dense ; surface spongy-echinulate ; wall 
finely striato-echinulate. 
Solomon Islands. 
a. Shortland Island, Solomon Islands. Dr. Guppy [P.]. 84.12.11.18. (Type.) 
168. Madrepora beodactyla. (Plate XIII. figs. A, B.) 
Madrepora seriata, Briiggemann (non Ehrenberg), Phil. Trans. 1879, vol. elxviii. p. 575. 
? Madrepora haimei, Briiggemann (part.), loc. cit. p. 575. 
Madrepora beodactyla, Brook, Ann. Mag. N. H. 1892, vol. x. p. 453. 
Corallum low, flattened cespitose from a broad incrusting base. The largest specimen is 
oval and measures 20 cm. by 14 cm., and is 5 em. high. Branches erect, digitiform, simple or 
proliferous, the marginal ones oblique, apex blunt or conical ; length 3 to 4.cm., diameter 7 
to 10 mm.; in some specimens the majority of the central branches are simple, in others 
divided into 2 to 6 more or less radiating twigs. Axial corallites 2 to 3°5 mm. diameter, 
scarcely exsert or short and tapering, margin much rounded. Radial corallites chiefly open- 
nariform or gutter-shaped with an oblique apex, lower border of the wall almost horizontal ; 
length 1°3 to 2 mm. rarely more, diameter 1:6 mm., becoming shorter and subimmersed 
below. Wall usually thin and margin not rounded, but in one specimen from Rodriguez, which 
does not differ in other respects, the wall is thicker, the aperture correspondingly smaller, 
and the margin somewhat rounded (fig. A). In another Rodriguez specimen the radial 
