164 MADREPORARIA. 
Several fragments of an apparently corymbose specimen appear to belong to this species, 
The axial corallites are 3°5 to 4.mm., somewhat conical, with a rounded margin. Radial 
corallites often subimmersed quite to the apex of the branchlets, but the outer part of the 
wall is usually more or less dilated ; the more prominent ones are hemicotyloid, 2°5 mm. 
long and 2 mm. diameter, the inner part of the wall wanting, the outer thick and rounded at 
the margin, those near the apex of slender twigs are open nariform, with a comparatively 
thin wall. 
Pacific Ocean: Hong Kong and China (probably South). 
a-d. China (probably South). Fisheries Exhibition [P.]. 84. 2. 26. 9, 11 to 13. 
174. Madrepora glauca. (Plate XXXIV. fig. D.) 
Corallum semi-vasiform from a lateral attachment. The branches are short and erect 
above the base, and gradually become more elongate and oblique towards the periphery ; all 
of them reach to about the same plane. They vary from 4 to 125 em. in length and from 
1:2 to 1:6 em. in diameter ; they are arranged in several rows of gradually increasing length, 
and, although close together, are rarely confluent. The surface of the branches is very dense, 
and consists of very crowded, blunt echinulations of equal length, so that the surface is 
smooth to the touch. A thin layer immediately beneath the surface is less dense. The under 
surface is provided with a few short conical twigs without prominent corallites, and at distant 
intervals a few immersed corallites occur, which are provided with a very prominent star of 6 or 
more septa. The branches give rise on the upper surface to short, stout, tapering branchlets, 
which are rendered irregular by the presence of numerous stout spreading corallites, which 
become proliferous; length 2 to 3°5 cm., diameter at the base about 1 cm. Axial corallites 
stout, conical, 4 mm. diameter at the base and 3 or 4 mm. exsert; star well developed, the 
primary septa subequal. Radial corallites round, open-nariform at first, becoming short, 
ascending tubular by completion of the inner part of the wall, but decreasing in length and 
finally immersed or subimmersed at a point about 2 cm. below the apex. The wall is at first 
of moderate thickness, but becomes thicker in the tubular corallites, which have also a rounded 
margin. Length of the outer part of the wall (the inner is scarcely free in short corallites) 
2 to 4mm., diameter 1:8 to 2°5 mm.; a few are stouter, more elongate, and spreading, and 
become converted into new axial corallites. The septa are well-developed in all cases; at first 
the directives are broader than the other primaries, and the second cycle is rather narrow. 
Corallum very dense; the corallite-wall is at first closely vermiculate with delicate spmes on 
the ridges, but later becomes covered with crowded, blunt echinulations, like the general 
surface. 
West Australia. 
a. West Australia. Purchased. 86. 2. 26.7. (Type.) 
