FAMILIES AND QENEEA OF THE MADEEPOEARIA. 191 



polygonal, numerous, minute, irregular. Septa a series of 

 needle-shaped points. Wall of corallites thickly studded with 

 short, stout, and very conical points, swollen at the base, and 

 j)ointing towards the interior of the fossa. A common epitheca 

 in very thick folds, Gremiiiation intracalicular. 



Distribution. — Recent. Pacific. 



The E-ev. T. Woods gives a delineation of the species ; and 

 there is no intermediate ccBDenchyma shown between the calices. 



M. de Promentel, op. cit. p. 256, places the genus Pleuro- 

 dictyum, Goldfuss, in the group Perforata, which includes Porites. 

 This genus finds no place amongst the Madreporaria Perforata, 

 as it is founded on a cast of a species of the genus Michelinia, 

 a Palaeozoic tabulate form which in all probability belonged to 

 the Alcyonaria. 



M. de Promentel* places the genus Holarwa, which was 

 founded by Milne-Edwards and Jules Haime to receive Alveo- 

 lites parisiensis, Miclielin, amongst the Perforata in the neigh- 

 bourhood of Porites. The condition of the specimens on which 

 the above-named species was established is very defective. Milne- 

 Edwards and Jules Haime, in 1860, in their ' Hist. Nat. des 

 Corall.' vol. iii. p. 244, place JPolaroGa as a synonym of Accopora, a 

 genus with tabulae, and certainly not one of the Madreporaria, 

 but an Alcyonarian. Holarcea is therefore no longer a genus. 



The genus Goenostroma, Winchell, is probably an ally of Stro- 

 matopora, and not a coral. 



II. Alliance MONTIPOROIDA. 



Poritidse with a more or less abundant spongy coenenchyma. 



Genus Montipoka, Quoy & Gaim. 

 Genus Anacropora, Ridley. 



Grenus Moktipoea, Quoy et Gaimard, Voy. ^Astrolabe,' Zooph. 



p. 247 (1833); Verrill, Notes on Badiata, Revision of Corals 



of West Coast of America (1868-70), p. 502. 



Colony various in form, glomerate, massive, incrusting, folia- 



ceous, lobate or branching. Coenenchyma abundant, porous, or 



spongy, usually echinulate at the surface, and often rising into 



ridges, papilliform eminences, and crests between the corallites ; 



* ' lutrod. a I'Etude des Polyp, foss.,' Paris, 1858-60. 



