MATTHAI— RECENT COLONIAL ASTR^ID.^ 11 



In Milne Edwards and Haime's type (5x5x5 cm.) of Heliastrcea stellulata from 

 West Indies, the corallites are slightly projecting and are separated by polygonal furrows, 

 the calicos oval or circular and about 2 mm. in diameter ; the septa are similar in nature 

 and number to those of Heliastrcea annularis ; the corallum also shows clear signs of 

 budding. • 



Milne Edwards and Haime's examples (5 small ones) of Plesiastrcea urvillei from 

 Australia come near the above specimens, but it is doubtful if they belong to the same 

 species. 



According to Duerden (32, p. 563) two directive couples of mesenteries are present in 

 the polyps of Orhicella annularis. 



5. 1 Madrepora pleiades, Ell. and SoL, Zooph., p. 169, PL 53, figs. 7 and 8. 



I have examined a somewhat defaced specimen in the Glasgow Museum, which, 

 though not identical with Ellis and Solander's fig. 7, closely resembles it. Its corallites 

 are small and circular in outline, the calices being 2 — 2"5 mm. in diameter. Twelve septa 

 meet the columella in each corallite ; alternating with these is a cycle of narrower septa 

 which curve towards and fuse with the sides of the former in pairs. 



Without polyps it is not possible to determine the genus to which this specimen 

 belongs. It appears to be more related to Cyphastrea than to any other existing 

 genus. 



GROUP II. 



GENUS FAVIA (OKEN). 



180L Astrea, sec. i, Lamarck, Syst. Anim. sans vert., p. 371. 



1815. Favia, Oken, Lehrb. Naturg., i, p. 67. 



1816. Astrea (pars), Lamarck, Syst. Anim. sans vert., ii, p. 257. 

 1830. Tuhastrea (pars), Blainville, Die. Sci. Nat., Ix, p. 334. 

 1830. Bipsastrea (pars), Blainville, Die. Sci. Nat., Ix, p." 338. 

 1834. Favia (pars), Ehrenberg, Oorall. roth. Meer., p. 93. 

 1834. Astraia (pars), Ehrenberg, Corall. roth. Meer., p. 95. 



1846. Orhicella, subgenus I of Asircea (pars), Dana, Expl. exp. Zooph., p. 206. 



1846. Fissicella, subgenus III of Astrcea (pars), Dana, Expl. exp. Zooph., p. 220. 



1848. Astrea (pars), Milne Edwards and Haime, Compt. rend. TAcad. Sci., xxvii, p. 494. 



1848. Plesiastrea (pars), Milne Edwards and Hainie, Compt. rend. I'Acad. Sci., xxvii, p. 494. 



1848. Phymastrea, Milne Edwards and Haime, Compt. rend. I'Acad. Sci., xxvii, p. 494. 



1848. Parastrea, Milne Edwards and Haime, Compt. rend. I'Acad. Sci., xxvii, p. 495. 



1848. Oulastrea, Milne Edwards and Haine, Compt. rend. I'Acad. Sci., xxvii, p. 495. 



1848. A canthastrea, Milne Edwards and Haime, Compt. rend. I'Acad. Sci., xxvii, p. 495. 



1848. Prionastrea, Milne Edwards and Haine, Compt. rend. I'Acad. Sci., xxvii, p. 495. 



1857. Favia, Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 426. 



1857. Goniastrcea (pars), Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 444. 



1857. Heliastrma (pars), Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 456. 



1857. Ulastrcea, Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 488. 



1857. Plesiastrcea (pars), Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 489. 



1857. Phymastrcea, Milne Edwards and Haime, Hist. Nat. Corall, ii, p. 499. 



1857. Acanthastrcea. Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 501. 



1857. Prionastrcea (pars), Milne Edwards and Haime, Hist. Nat. Corall., ii, p. 513. 



