60 PERCY SLADEN TRUST EXPEDITION 



1848. Sarcinula ellissii, Milne Edwards and Haime, Ann. Sci. Nat., Zool., 3'' ser., x, p. 315. 



1 1848. Sarcinula irregularis, Milne Edwards and Haime, Ann. Sci. Nat., Zool., 3'* ser., x, p. 316. 



1848. Sarcinula hystrix, Milne Edwards and Haime, Ann. Sci. Nat., 3"^ ser., x, p. 318. 



1851. Galaxea fascicular is ellisi and irregularis, Milne Edwards and Haime, Pol. foss. terr. palseoz., etc., p. 71. 



1857. Galaxea fascicular is, Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 227. 



1857. Galaxea ellisi, Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 228. 



? 1857. Galaxea irregularis, Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 229, pi. D2, fig. 2(1 and h. 



1877. Galaxea fascicularis, Studer, Monat. Ak. Wiss. Berlin, p. 637. 



1877. Galaxea ces2ntosa, Studer, Monat. Ak. Wiss. Berlin, p. 637. 



1879. Galaxea fascicularis, Klunzinger, Korall. Both. Meer., ii, p. 78. 



1 1879. Galaxea irregularis, Klunzinger, Korall. Roth. Meer., ii, p. 78, pi. 7, fig. 11. 



1886. Galaxea aspera, Quelch, Reef Corals, Challenger Reports, Zool., vol. xvi, ptxlvi, p. 72, pi. 4, fiigs. 5 — 5d. 



1886. Galaxea ellisii, Quelch, Reef Corals, Challenger Reports, Zool.. vol. xvi, pt xlvi, p. 72. 



1899. Galaxea fascicularis, Gardiner, Proc. Zool. Soc, p. 763. 



1904. Galaxea fasvicularis,_Ga,rdmer, Fauna Geogr. Maldives and Laccadives, ii, p. 783. 



1906. Galaxea irregularis, Marenzeller, Exp. "Pola," Rot. Meer., RiifkoralL, Zool. Ergeb. Wien, xxvi, p. 54. 



Corallum. Perithecal vesicles small, 75 X '5 mm. in size, usually open on surface. 

 Oorallites circular or oval in outline, projecting above peritheca to 15 mm. or possibly 

 more, decreasing in diameter from calicular ojiening (8*5 mm.) to peritheca (5 mm.), 

 1 — 2'5 mm. apart, diverging upwards from peritheca; walls '75 mm. thick towards bases, 

 thinning to the free margins. Largest calices when round 8 mm. in diameter, when oval 

 9x6 mm. ; depth from calicular opening to columella 3 mm. 



Septa in five orders, the first four complete, the fifth incomplete, very narrow, 

 maximum number ten, hence most of the quaternaries exocoelic ; septa exsert vertically, 

 sides smooth, edges entire, sharp ; primaries thicker than secondaries, both exsert for 

 2 — 3 mm., not swollen in thecse, and meeting columella. Tertiarles with edges bent 

 towards and united with sides of secondaries, sometimes extending near to columella ; 

 quaternaries occasionally fused with sides of tertiaries, both exsert to 1 mm. Costse 

 smooth, seen as low sharp ridges in upper third of corallite-wall, below as striae. Columella 

 poorly developed, primary and secondary septa almost meeting in centre (as in Baryastrea 

 transversa). Budding near the edge of corallum from peritheca. 



The smallest corallite measured 5 "5 mm. in height and 3 mm. in diameter, with three 

 complete orders of septa, the primaries and secondaries meeting columella. 



Polyps. (1) Size corresponding with corallites. (2) Entocoelic tentacles as well 

 developed as exocoelic ; terminal batteries with thickened ectoderm and closely packed 

 nematocysts ; sub-terminal batteries well defined, up to thirty or thirty-five. (3) ExoccbIIc 

 tentacles similar. (4) Quaternary couples of mesenteries present, cycle incomplete. 



(5) Ectoderm of outer wall of edge-zone and oral-disc about the same thickness. 



(6) " Ovoid bodies " numerous. (7) Algse not very abundant. 



Remarks, A. Polyps. Quaternary couples of mesenteries in the two large polyps 

 sectioned numbered 0, 0, 0, 3, 0, 2 and 0, 3, 2, 1, 2, 3. The convolutions of mesenteries are 

 massed together in the inter-mesenteric chambers for some distance below the stomodseum, 

 but scarce towards the base of the polyp. The stomodseum with lumen distinct, diameters 

 2X'75 rnm. In some of the "ovoid bodies" a thick central core with a faint spiral 

 around it is visible, suggestive of degenerate nematocysts III. The calicoblast is 

 thickened near the skeletal attachments of the mesenteries about the thickness of the 



