MADREPORARIA. 771 



fossa. Cohimellii not more than ^ breadtli (jf calice, generally very small, often rudimentary, 

 formed by the much flattened trabecular ends of 6 to 8 septa. In section rather massive, 

 exothecal dissepiments thick, 1 mm. apart, endothecal thin, horizontal, about 6 mm. 



The species is rather like a small edition of F. denticulata, but diifers in its thin walls, 

 number of septa, number of septa forming the columella, and character of last. The specimens 

 show similar variability, and I likewise enumerate them in tabular form. No. 1 differs some- 

 what from the rest ; it has some rather larger calices with very exsert septa, and a greater 

 number reach the columella and have paliform lobes, but these differences are due to the 

 fact that the colony is evidently growing very vigorously and its corallites rapidly dividing. 

 No. 4 is possibly a little doubtful on account of its deeper calices, septa larger in number 

 (last 6 to 10 exceedingly minute), little exsert ('75 mm.), costae little notched and transversely 

 connected; it is growing on a column of horny sponge, 10 cm. high by about the same thick, 

 which itself was attached to a muddy bottom. 



27. Favia hombroni (Rousseau). (PI. LXII. fig. 27.) Ed. and H., p. 435. 



Two .specimens which differ only in not being " en masse gibbeuse et sublobee," but 

 massive and rounded and in the columella not being " assez distincte," but the distinct, rather 

 flattened, trabecular junctions of about 6 septa. I give certain characters of my specimens. 



Calices rounded, oval or angular, averaging about 3 mm. in diameter, though varying up 

 to 6 mm., theca generally quite distinct above the top exothecal dissepiment. Walls "75 — 1 mm. 

 thick, except at the edges, where this may be doubled, covered by thin, smooth, sub-equal 

 costae ('5 — '75 mm. exsert), continuous between calices, horizontal, no furrow nor distinct notch. 

 Septa almost smooth-sided and thin, cycles I. and II. and about half of III., scarcely visibly 

 toothed, I. rather broader over wall and with a crown of fine, pointed, paliform teeth, often 

 joined by 1 to 3 septa of cycle II. Columella generally as above at the surface, underneath 

 much larger and of a more solid appearance. 



Locality. Hulule passage, a small colony 10 by 8 by 7 cm., and Minikoi, almost in boulder 

 zone, a head dead in the centre. 



28. Favia halicora (Ehrb.) Klz. 



Goniastraea halicora Klz., p. 32, iv. 1 and 2, and x. 3 a and b. 



Four specimens, two large ones approaching /brma ohtusa Klz. and two pieces with smaller 

 calices rather moi-e doubtful, more like forma acuta Klz., the pali in reality being only teeth 

 and the theca of neighbouring calices not fused though the walls are very dense, jaerhaps 

 almost solidified by the exotheca. 



The specimens are as follows: (1) half a large head, 22 cm. wide, 13 cm. broad, and 18 cm. 

 high, walls rounded, though not so much as in Klz.'s fig. 1, septa 28 to 36, half with blunt, 

 thick pali, Minikoi, lagoon shoal ; (2) a colony dead above, 16x14x8 cm., part like last, part 

 very obtuse walls, columella then often papillated above, Minikoi, inner part reef-flat to south ; 

 (3) a colony, 8x6x5 cm., calices about 8 mm., very rapidly dividing, resembles part of (1) but 

 nearer acuta in walls, Turadu, S. Mahlosmadulu, reef-flat; (4) a colony 12 x 6 x 6 cm., calices 

 7 '5 mm., rapidly dividing, very acute walls, Goidu, reef-flat. 



29. Favia parvimurata, n. sp. (PI. LXII. fig. 25.) 



Colony massive, covered underneath by a thick, transversely marked epitheca. Calices 

 generally pentagonal or hexagonal, 8 — 12 mm. (mode 9 — 9'5 mm.) in diameter, 3 mm. deep or 

 G. II. 99 



