REPORT ON THE REEF-CORAILS. 105 
2. Plesiastrea indurata, Verrill. 
Plesiastrxa indurata, Verrill, Proc. Essex Inst., vol. v., part 3, p. 35, pl. i. fig. 7. 
A single fine specimen is referable to this species. It is close to Plesiastrea 
coronata, but differs in its larger and deeper cells and its more numerous septa. 
Towards the outer part of the corallum the cells are very obliquely placed, as in 
Plesiastrea coronata. 
Locality.—Kandavu, Fiji. 
Genus 23. Phymastrea, Milne-Edwards and Haime. 
Phymastrza, Milne-Edwards and Haime, Cor., ii. p. 499. 
6 Dunean, Rev. Madrep., p. 106. 
Phymastrea aspera, n. sp. (PI. TV. figs. 1-10). 
Corallum massive, heavy, irregularly convex. Calicles rather large, very unequal and 
deep, polygonal, circular, oval or elongated, greatest width from about 9 to 11 mm., 
many calicles less, about 4 to 5 mm. deep; furrows between the calicles well marked, 
very narrow, with deep spaces between the connecting portions occupied by small tubes 
—apparently worm tubes—which preserve the intercalicinal spaces and keep them open 
during the growth of the colony; costee unequal, denticulate, those of opposite cups 
often coalescing. Septa not perforated, of five cycles, the last being very rudimentary, 
the fourth bemg small; those of the three first cycles are subequal, large, and rather 
thick, much exsert, and roughly, unequally, and bluntly toothed; the innermost teeth 
are very distinct, large, long, and paliform, not divided, surrounding a distinct deep and 
narrow depression, at the bottom of which is a small, subtrabeculate or papillose 
columella which is almost absent in a transverse section. Texture of the corallum very 
dense and hard. 
This species is represented by a single specimen. At the outer part, the cups become 
rather shallow and approach very closely to the form of those of Phymastrea 
valenciennesi. It is, however, distinguished from Phymastrea valenciennesi by its 
convex mode of growth, by its more distinct and prominent calicles which are also quite 
deep, by the much greater development of the septa, which are more exsert, numerous, and 
closely placed, not perforated, with non-bifureated and large paliform teeth, and by the 
slight development of columella. From Phymastrea profundior it is distinguished by 
the large size and irregular growth of the calicles, and by the numerous septal orders, 
the septa being quite close, exsert and thickened, furnished with a very distinct, large, 
paliform lobe. 
Locality.—Banda. 
(ZOOL. CHALL, EXP.—PART XLVI.—1886.) Zz \4 
