MATTHAI— RECENT COLONIAL ASTR^ID^ 89 



(a doubtful specimen). Ooetivy (1). Also one of Ehrenberg's specimens from the 

 Red Sea. 



4. Favia glouei (Valenciennes). (PI. 10, fig. 6 ; 23, figs. 1, 2 and 5 ; 25, fig. 3 ; 

 34, fig. 1.) 



1797. Madrepora radiata, Esper, Forts. Pflanz., p. 74, pi. 61 (non Madrepora radiata, Ellis and Solander). 



1815. Favia radiata, Oken, Lehrb. Naturg., i, p. 68. 



1834. Favia uva, Ehrenberg, Corall. roth. Meer., p. 94 (non Madrepora uva, Esper, which is a Dichocoenia). 



? 1846. Astrea (Jissicella) speciosa, Dana, Expl. exp. Zooph., p. 220, pi. 11, fig. 1. 



Parastrea clouei, Valenciennes, Mss., Catal. Mus. Paris. 



1849. Parastrea radiata, Milne Edwards and Haime, Ann. Sci. Nat., Zool., 3" ser., xii, p. 169. 



1857. Favia okeni, Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 430. 



1857. Favia clouei, Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 436 (non Favia clouei, Klunzinger). 



1879. Favia cavernosa, Klunzinger, Korall. Roth. Meer., ii, p. 26, pi. 3, fig. 4 (non Madrepora cavernosa, ForskSl). 



1879. Favia tuhulifera, Klunzinger, Korall. Roth. Meer., ii, p. 28, pi. 3, fig. 6, and pi. x, fig. 2. 



1899. Astrma affinis, Gardiner, Proc. Zool. Soc. London, p. 750 (non Favia affinis, Milne Edwards and Haime). 



1904. Favia cavernosa, (pars), Gardiner, Fauna Geogr. Maldives and Laccadives, ii, p. 767, pi. 61, fig. 13. 



1904. Favia affinis, Gardiner, Fauna Geogr. Maldives and Laccadives, ii, p. 767, pi. 62, figs. 22 and 23. 



Corallum. Massive, becoming convex. Peritheca highly vesicular, vesicles on 

 surface often like blisters, easily broken, dissepiments thin, 1 — 1"5 mm. apart, corallum 

 consequently light. Corallites oval, irregularly compressed or circular, with usually 

 distinct margins, level or projecting to 1'5 mm. ; interior often appearing blistery ; owing to 

 vesicular deposition of calcareous matter ; up to 7 or 1 mm. apart, average 2 — 4 mm. 

 Calices 7 — 10 mm. in diameter, average depth 4 or 5 mm. 



Septa thin in calices, often swollen in thecse (swollen parts hollow), usually vertical, 

 with toothed edges, spinulose sides, exsert to 1 or 1*5 mm., about 35 in number; of these 

 up to 17 or 18 meeting columella, average 13 — 15, with the upper two-thirds or half 

 much narrower than the lower one-third or half, the former with short teeth or entire 

 edges, while the latter with 8 or 4 prominent teeth, the first two of which often vertical, 

 simulating a pali-crown ; sometimes an alternating cycle of rudimentary septa present. 

 Columella formed of thin twisted septal trabeculse, -^ — \ width of calyx, sometimes rudi- 

 mentary. Gestae prominent, thin, toothed, continued over peritheca as thin ridges usually 

 meeting those of neighbouring corallites, the perithecal costee often tending to be united 

 transversely by a thin heavy ridge along the middle of the perithecal regions. 



Multiplication by unequal, sometimes equal, fission. 



The species is characterised by the light corallum, perithecal costae, open calices, and 

 thin septa. 



Polyps. (1) Both entocoelic and exocoelic tentacles present (the latter few in 

 number). (2) Stomodseal ridges thicker than broad, with convex inner surfaces and 

 sides almost perpendicular or only slightly sloping. (3) About eight principal couples of 

 mesenteries. (4) In the stomodseal region of polyp subsidiary couples of mesenteries, 

 about twice the number of principal couples. (5) In the same region of polyp, entocoelic 

 pleats, somewhat narrow, unconstricted, some of them sub-divided, arising usually at right 

 angles to the mesogleea, sometimes sloping towards stomodseum and extending to not 

 more than middle of principal mesenteries, usually over about one-third their width ; 

 SECOND SERIES— ZOOLOGY, VOL. XVII. 12 



