MADEEPOKA. 195 



usually very spreading, 1 to 2 mm. diameter and 1 to 4 mm. 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 corallites 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, i 



& 91. 19. 9. 1. I Types, 



c. Samboangan. H.M.S. ' Challenger.' 80.11.25.15. J 



rf. Macclesfield Bank, 36 to 43 fath. H.M.S. ' Penguin.' 92.10.17.31. 



e. Macclesfield Bank, 25 to 28 fath. H.M.S. 'Penguin.' 92. 10. 17. 32. 



212. Madrepora angulata. 

 Madrepora angulata, Quelch, ' Challenger ' Reef Corals, p. 160, pi. ix. fig. 5. 



Corallum probably lax and spreading arborescent with slender branches. The type 

 specimen consists of a single 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"5 to 5 mm. long and 

 about 1'5 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.) 



