106 PERCY SLADEN TRUST EXPEDITION 



1899. Orbicella carta, Gardiner, Proc. Zool. Soc. London, p. 754. 



1899. Orbicella coronata, Gardiner, Proc. Zool. Soc. London, p. 754. 



1899. Orbicella rotumana, Gardiner, Proc. Zool. Soc. London, p. 755, pi. 49, fig. 3. 



? 1904. Orbicella ourta, Gardiner, Fauna Geogr. Maldives and Laccadives, p. 776. ^ 



Corallum. Incrusting. Corallites circular or oval, projecting more than in 

 F. loahayana, average 2*5 or 3 mm., with conspicuous rims and separated by deep grooves. 

 Calices from 5 — 8 mm. in diameter, depth about 5 mm. 



Septa thickening towards theca, almost vertical, with toothed edges, spinulose or 

 granular sides, exsert to about '7b or 1 mm., 20 — 28 in number; 9 — 15 septa meeting 

 columella, average 10 — 13, each usually with a paliform lobe behind which it is perforated, 

 6 — 8 of the principal septa broader and thicker than in F. ivakayana (this being a 

 marked feature of the species) and exsert up to 2 mm. An alternating cycle of very 

 narrow septa present, with smaller costse. Costge conspicuous, more or less flat ridges, 

 varying in thickness in accordance with their septa, with transversely extending 

 granulations usually meeting in inter-corallite grooves. Columella poorly developed, 

 spongy, \ — \ width of calyx. 



Multiplication as in F. wakayana by budding, rarely aided by fission. 



This species is a larger and thicker edition of F. wakayana. 



Milne Edwards and Haime's type of Heliastrcea solidior is a small specimen 

 (7 X 4"5 X 5 cm., PI. 25, fig. 8) from Tongatabou, similar to Gardiner's example of Orbicella 

 coronata. 



Localities. Funafuti (2). Rotuna (1). ? Maldives, Mahlos madulu (a fragment). 

 Also from Tongatabou (Milne Edwards and Haime). 



15. Favia halicora (Ehrenberg). (PI. 26, figs. 3 and 5 — 7.) 



1834. Astrcea halicora, Ehrenberg, Corall. roth. Meer., p. 96 (non Prionastrcea halicora, Milne Edwards and 



Haime). 

 1879. Goniastrcea halicora var. acuta, Klunzinger, Korall. Roth. Meer., iii, p. 33, pi. 4, fig. 1. 

 1889. Favia ehrenhergi, Ortmann, Steinkorall. siid. Ceylons, Zool. Jahrb., iv, p. 526 (non Favia ehrenbergi, 



Klunzinger). 

 1904. Favia halicora, forma obtusa, Gardiner, Fauna Geogr. Maldives and Laccadives, p. 771. 

 1904. Prionastrcea crassior, Gardiner, Fauna Geogr. Maldives and Laccadives, ii, p. 786, pi. 64, figs. 45 



and 46 (non Prionastrcea crassior, Milne Edwards and Haime). 



Corallum. Incrusting or massive. Corallites polygonal, sometimes oval or circular, 

 level or projecting to 1 — 2 mm., usually separated by polygonal furrows. Walls "75 — 2 mm. 

 in thickness. Calices oval or circular, sometimes polygonal, with diameters 9 — 11 mm. 

 and 7 — 8 mm. (when circular 6 — 8 mm.), depth 3 — 6 mm. ; much shallower towards 

 edges of corallum. 



Septa thin in calices, thickened or swollen in theca, up to 1 mm., with toothed edges, 

 slightly rough to spinulose sides, exsert up to 1 mm., 25 — 40 in number, average about 30; 

 of these up to 20 meeting columella, usually 15 — 17, with upper two-thirds or half narrow 

 and usually vertical; on each septum 6 — 10 teeth, longer and closer together towards 

 columella ; lower one-third or half of principals much broader, these or the ring of last 

 septal teeth forming a pali-crown. Septa oblique in some of the calices — particularly in 

 the shallower calices. Subsidiary septa usually curving towards and fusing with sides of 



