MADREPORA. 195 
usually very spreading, 1 to 2mm. diameter and 1 to 4mm. long ; they are distributed radially, 
and form prominent series along the lateral borders, but are almost absent from the under 
surface of flattened branches. The longest corallites, which are usually sublateral in position, 
give rise to branchlets. The star of the radial cerallites consists of a moderate primary series 
of septa together with a more or less fully developed second cycle. Corallum porous ; surface 
and wall strongly striate and echinulate. 
Two specimens of this species occur in the second collection made on the Macclesfield 
Bank by Mr. Bassett-Smith, R.N., which are rather more fragile than the type specimens. 
The tubular corallites are often 4 mm. apart, 2 to 4 mm. long, and 1:5 to 2 mm. diameter ; 
those on the anterior and posterior surfaces rarely bear buds. Wall rather thin, margin not 
rounded. 
Pacific Ocean : Tahiti, Philippine Islands, China Sea. 
a, b. Tahiti. H.M.S. ‘Challenger.’ 86. 12. 9. 222, 
Sa Oils WM): Gb Ile jy 
c. Samboangan. H.M.S. ‘Challenger.’ 80. 11. 25. 15. 
d. Macclesfield Bank, 36 to 43 fath. HeOMeES teens aim.ce 92.0 rsle7aroile 
e. Macclesfield Bank, 25 to 28 fath. H-M-S. “Penguin.” *92. 10: 17. 82. 
212. Madrepora angulata. 
Madrepora angulata, Quelch, ‘ Challenger ’ Reef Corals, p. 160, pl. ix. fig. 5. 
Corallum probably lax and spreading arborescent with slender branches. The type 
specimen consists of a smgle curved, apparently subprostrate branch, about 17 cm. long and 
7 mm. thick near the base, becoming somewhat thicker above, not terete, distinctly angular 
in places. The branchlets are 2 to 5 cm. long, and 5 mm. diameter at the base, usually 
attenuate when simple, but scarcely tapering when further subdivided, arising at an angle of 
about 50°. Axial corallites 2 mm. diameter, scarcely exsert, wall thin but dense. The 
primary septa are well developed and a narrower second cycle is usually present. Radial 
corallites not numerous, frequently arranged in linear series, 1°55 to 5 mm. long and 
about 15 mm. thick, tubo-nariform or rostrato-nariform, intermixed with many ascending 
tubular ones having a round aperture; the rows are sometimes 4 mm. apart; the corallites 
become shorter below, but none are truly immersed. The septa are unequally developed 
in the radial corallites ; the directives usually become fused together, the remaining 4 of the 
primary cycle are not very prominent, and a second cycle may be more or less completely 
represented in rudiment. Corallum dense but reticulate in section; surface dense and 
occasionally pitted, finely echinulate in longitudinal lines; wall more or less distinctly 
striate and echinulate. 
Philippine Islands. 
a, Samboangan. H.M.S. ‘ Challenger.’ 86. 12.9. 235. (Type.) 
