174 MADEEPOEAEIA, 



5 mm. long, wall very thick and dense, margin rounded, aperture very small. Radial 

 corallites unequal, very spreading, mostly at right angles or nearly so ; the longer ones 

 tubular, 3 to 5 mm. long and 3 mm. in diameter, wall thick, margin rounded, aperture 

 0'5 mm. or a little over. Between these, numerous smaller, short, cylindrical or verruciform 

 ones occur, but none are completely inunersed. In the forms which extend more or less 

 obliquely, the underside has fewer or more distant corallites, often without aperture. 

 Corallum very dense ; siirface covered with crowded elongate echinulations ; wall finely 

 echinulate, not striate. In the axial corallites the star consists of 12 septa, the primaries 

 subequal and the second cycle narrow ; in some of the radial corallites a second cycle does 

 not occur. 



A. Var. fortis, Klunzinger. 



Corallum 40 cm. high and wide. Branches 2 cm. thick, bearing numerous spreading 

 branchlets about 25 cm. long and 1'5 cm. thick. Axial corallites 5 to 6 mm. thick; radial 

 corallites 4 to 5 mm. long and 4 mm. thick. Many of the most prominent corallites are 

 6 mm. long and 4 to 5 mm. broad at the base, wall tapering ; some bear a few bud- corallites 

 near the base. 



B. Var. obtusata, Klunzinger. 



Corallum laxly arborescent, branches blunt at the apex. Axial corallites 5 mm, 

 diameter, little exsert. Radial corallites rather short and stunted, cylindrical, not conical, 



3 mm, broad and 3 to 4 mm. long, forming with the stem a wide acute angle. 



C. Var. variolosa, Klunzinger. 



Corallum laxly arborescent, with ascending digitiform branches. Stem 2 cm. thick, 

 branches 3 to 10 cm. long, 1'5 mm. thick at the base, 1 cm. at the apex. Axial corallites 



4 to 5 mm. broad ; the majority of the radial corallites are 3 to 5 mm. broad and 3 to 4 mm, 

 long, but a few small verruciform ones are scattered between. 



D. Var, depressa. 



Corallum prostrate (?), with few branchlets and corallites on the under surface. Branch- 

 lets on the upper surface arched upwards, 3 to 6 cm. long, 1 cm, diameter, gradually 

 tapering, their apices about 2 cm. apart. Axial corallites 3'5 to 4 mm. diameter, 2 to 3 mm. 

 exsert. Radial corallites spreading tubular, 3 mm. diameter, mostly elongate (3'5 to 6 mm.) ; 

 some of the longer ones bear a few bud-corallites. The lower part of the branches bears 

 subimmersed corallites and others are completely immersed. A star of 12 septa is distinct 

 in nearly all the corallites. 



