MADREPORA. 49 
surface, and the fusions are almost confined to the lower part of the colony. Ultimate 
divisions often 4°5 cm. long and only 5 mm. thick, gradually tapering, but a few of the 
branchlets near the base are thicker and more distinctly acuminate. Tubular and proliferous 
corallites very spreading, 0°4 to 1°8 em. long, 2 mm. diameter at the apex and 3 mm. at the 
base, or more in the case of elongate ones which bear a number of very short open nariform 
buds. The smaller corallites between the tubular ones vary in shape as in var. scandens. 
The tubular corallites have 6 rather narrow subequal septa; the star is scarcely developed in 
the shorter and immerséd ones, but sometimes one or both the directive septa may project a 
little. Corallum moderately porous; surface striato-echinulate or reticulate and echinulate ; 
wall finely striate and echinulate or the striz may not be apparent. 
Var. scandens, K1z. 
The characteristic feature of the form figured by Klunzinger consists in the fact that the 
majority of the branchlets are short, stout, oblique, and taper suddenly at the apex, but others 
are more slender and gradually tapering as in the forms already described. The axial 
corallites are 2 to 3 mm. long and broad, but on the young budding branchlets they may 
attain a length of 6 mm. The radial corallites are of very variable length and form, 
appressed and often crowded, so as to obscure the coenenchyma. Someare tubular, 4 to 6 mm, 
long, with or without buds, and only differ from the axial corallites in the oblique aperture ; 
between these many are short, dimidiate, or with the outer part of the wall pointed or 
almost absent; lower down many are verruciform with variously directed aperture, or 
completely immersed. Corallum porous; surface striato-echinulate, the echinulations often 
plate-like and not crowded, on a ribbed, rarely reticulate and trabecular ground ; wall finely 
striate. 
I can confirm the statement of Klunzinger that Ehrenberg’s Heteropora pocillifera, the 
type of which is in Berlin, is not identical with M. ehrenbergi, as Milne-Edwards supposed. 
Although the name was evidently suggested by this supposed identity, there is no doubt that 
Milne-Edwards had before him the Paris Museum type at the time, and his description was 
based on that specimen, and not on Ehrenberg’s; his name therefore has priority. 
Indian Ocean ; Red Sea; Persian Gulf. 
a. Red Sea. J. A. W. Harper [P.]. 78. 3. 18. 1. 
6. Koseir, Red Sea. Klunzinger Coll. 86.10.5.8. (Var. scandens.) 
c. Persian Gulf. A.S. G. Jayakar, Esq. [P.] 92.1. 18. 1. 
29. Madrepora clathrata. (Plates V., VI. figs. A, B.) 
Madrepora clathrata, Brook, Ann, Mag. N, H. 1891, vol. viii. p. 459. 
Corallum fan-shaped, reticulate, 30 em. high, breadth across the upper part 33 cm., but 
becoming rapidly narrower below. A main stem is absent, and the branches in the lower 
part have a diameter of about 1 cm.; their subdivisions are at first only slightly spreading, 
but become more divaricate above. The branchlets are numerous, 2 to 4 cm. long and 5 mm. 
