164 MADEEPORA.RIA. 



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 o£ 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 12'5 cm. in length and from 

 1*2 to 1"6 cm. 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 axe 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 4 mm., 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 spines 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.) 



