110 MADREPORARIA, 
104, Madrepora kenti. (Plate XI. fig. B.) 
Madrepora kenti, Brook, Ann. Mag. N. H. 1892, vol. x. p. 458. 
Corallum horizontal or corymbose, in either case the main branches are divided into two 
subparallel series of branches; the upper series bear branchlets on the superior surface and 
the lower series bear branchlets which are almost equally important on the inferior surface ; 
the main branches are 2 to 2°5 em. thick. The inferior series of branchlets in the horizontal 
form extend obliquely forwards, and are 3°5 to 5 cm. long and 5 to 7 mm. thick at the base, 
simple or proliferous at the apex ; the apices are nearly all arranged in one plane. Coral- 
lites large, very distant, round, appressed tubiform ; inner part of the wall not free in the 
shorter corallites, but more or less prominent in the more elongate ones ; length of the outer 
part of the wall 2 to 4 mm., diameter 2°5 mm., aperture 15 mm. The radial corallites are 
longest near the apex of a branchlet and gradually decrease in length towards the base ; 
scarcely any are completely immersed. The branchlets on the upper surface are similar to 
those below but less oblique ; length 3-5 to 6 em., diameter at the base 7 to 10 mm., the 
more slender ones are scarcely tapering. Axial corallites 2:5 to 8 mm. diameter, cylindrical, 
margin plane, aperture 15 mm. Radial corallites appressed tubular, similar to those below 
but more crowded and more prominent; the majority have the outer part of the wall 
produced into a rounded lip (ligulate), but the inner part is usually not free; length 3 to 
4 mm., diameter 2°5 mm. across the lip, but usually rather narrower at the base; in most 
cases the corallites are almost as prominent just above the base of a branchlet as near the 
apex. Star moderately developed, the two directive septa prominent, the other primaries of 
medium breadth, and frequently a narrow second cycle is also present. Corallum moderately 
porous in section, but dense and pitted at the surface, echinulate; wall striato-reticulate, 
echinulate at the base. 
The corymbose variety has more crowded and clustered branchlets ; on the upper surface 
two or three often spring from the same stalk, but the same bifarious condition of the 
branches and branchlets occurs as in the horizontal form. The outer part of the wall of the 
radial corallites is here not quite so spreading, and the inner part of the wall is rarely 
prominent except in corallites which become proliferous. 
Pacific Ocean: Torres Straits; Great-Barrier Reef. 
a, Thursday Island. Saville-Kent Coll. 92. 6. 8. 202. (Horizontal.) 
6. Low Woody Island. Saville-Kent Coll. 29. 6. 8. 203. (Corymbose. } bay tyes 
105. Madrepora bifaria. (Plate XXX. fig. A.) 
Madrepora bifaria, Brook, Ann. Mag. N. H. 1892, vol. x. p. 453. 
Corallum horizontal, with numerous erect spiciform branchlets on the under surface 
similar to those above. Colony 30 cm. long, 23 em. broad, and 12 em. thick. Main 
