84 PERCY SLADEN TRUST EXPEDITION 



has referred 41 specimens of the "Pola" expedition, 26 from Idda, 10 from Kamaran, 

 2 from Manuret and Hamidije, 1 each from Massawa, Bernice and Dahab. The 

 Idda, Bernice and Dahab specimens are heavier, thicker and rougher, belonging to 

 var. 2 of F. favus, characterised by heavy coralla, many of them having the facies of 

 Klunzinger's type of F. ehrenhergi var. laticollis, while the rest are lighter, thinner and 

 less coarse, belonging to var. 1. No. 15954 from Kamaran resembles Milne Edwards and 

 Haime's type of Favia amicorum and No. 15943 from Idda has towards its edge the 

 facies of Ehrenberg's type of Favia complanata. 



Localities. Red Sea (104). Chagos, Salomon (6). Seychelles (4). Maldives : 

 Suvadiva (1 from 25 fms.) ; Hulule (1 from reef). Minikoi (2 from reef). Singapore 

 (1 between reef and shore). Ceylon, Weligama (1). Funafuti, Ellice Islands (2 doubtful). 

 A species of wide distribution, particularly common in the Red Sea. Also from Tonga- 

 tabou (Milne Edwards and Haime) and Dar-es-Salaam (Ortmann). 



2. Favia dobeyensis, Milne Edwards and Haime. (PL 9, figs. 1 and 3 ; 22, figs. 8 

 and 9 ; 32, figs. 2—4.) 



1801. Asirea rotulosa, Lamarck, Syst. Anim. sans vert., p. 371 (non Madrepora rotulosa, Ellis and Solander). 



1816. Asirea rotulosa, Lamarck, Hist. Anim. sans vert., ii, p. 259 ; 2" edit., p. 405. 



1816. Astrea ananas, Lamarck, Hist. Anim. sans vert., ii, p. 260; 2" 6dit., p. 406 (non Madrepora ananas, 



Ellis and Solander). 

 1850. Parastrea doreyensis, Milne Edwards and Haime, Ann. Sci. Nat., Zool., 3^ s^r., xii, p. 168. 

 1850. Parastrea urvilliana, Milne Edwards and Haime, Ann. Sci. Nat., Zool., 3" s^r., xii, p. 169. 

 1850. Parastrea rotulosa, Milne Edwards and Haime, Ann. Sci. Nat., Zool., 3"^ ser., xii, p. 170. 

 1850. Parastrea ananas, Milne Edwards and Haime, Ann. Sci. Nat., Zool., 3"* s^r., xii, 172. 

 1850. Parastrea amplior, Milne Edwards and Haime, Ann. Sci. Nat., Zool., 3*^ s^r., xii, p. 172. 

 1857. Favia rotulosa, Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 429. 

 1857. Favia urvilleana, Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 432. 

 1857. Favia doreyensis, Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 432. 

 1857. Favia ananas, Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 435. 

 1857. Favia amplior, Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 436. 



? 1889. GoniastrcBa serrata, Ortmann, Steinkorall, Slid. Ceylons, Zool. Jahrb., iv, p. 526, pi. 15, fig. 10. 

 1899. Astrmaokeni, Gardiner, Proc. Zool. Soc. London, p, 749, pi. 47, fig. 2. 

 ? 1904. Favia cavernosa {^a,vs), Gardiner, Fauna Geogr. Maldives and Laccadives, p. 767, pi. 61, fig. 13 (non 



Madrepora cavernosa, Forskal and Favia cavernosa, Klunzinger). 

 1904. Favia denticulata, Gardiner, Fauna Geogr. Maldives and Laccadives, p. 768, pi. 61 (non Astrea denticu- 



lata, Lamarck or Gardiner, Favia denticulata, Ehrenberg, Milne Edwards and Haime, or Klunzinger). 

 1904. Favia laccadivica, Gardiner, Fauna Geogr. Maldives and Laccadives, p, 769. 

 1904. Orbicella laxa, Gardiner, Fauna Geogr. Maldives and Laccadives, p, 775, pi. 63, fig. 33 (non Orbicella 



laxa, Klunzinger). 

 1904. Orbicella borradailei, Gardiner, Fauna Geogr. Maldives and Laccadives, p, 775, pi. 63, fig. 34. 



Corallum. Massive, growth-form usually rounded. Peritheca vesicular, dissepiments 

 more or less horizontal, 1 or 1*25 mm. apart. Corallites oval, distorted or sometimes 

 circular, projecting to about 1 mm. Walls thin or thick, 2 or 2*5 mm. apart. Oalices with 

 diameters up to 13x9 mm. ; average 8x6 mm. ; of equal width from calicular margins to 

 bases, depth 2 — 7 mm., usually 4'6 mm. 



Septa thin or thick, usually vertical, with rough sides, 20 — 40 in number, average 

 24 — 34. Of these 14 — 20 meeting columella, each with its upper half or two-thirds 

 (edge with 2 — 6 teeth) narrower than its lower half or one-third and as a rule with 



