TRIBE III. MADREI'ORACEA. 569 



less finely porous, and have larger polyps and cells. The species 

 often grow in club-shaped masses or rude cylinders, which become 

 lobed above by furcation, and, like many Porites, only the top for one 

 to three inches is alive. These cylinders grow to a height of two feet 

 or more. 



The species are confined to the coral-reef seas, and have been 

 found only in the Pacific and Indian Oceans. 



This genus was proposed by Quoy and Gaymard, by whom the 

 polyps were first examined. The name alludes to the angular form 

 of the cells, and is derived from y m \>, an angle. 



1. GONIOPORA PEDUNCULATA. (Quoy $ Gaymard.) 



G. glomerata ; polyjris 2-3'" salientibus, kete virentibus ; tentaculis ob- 

 longis, obtusis. Corallum porosissimum ; cellis parvulis (!'" latis), 

 polijgonis ; margine granulatis seu inaqualiter denticulatis. 



Glomerate; polyps 2 to 3 lines salient, bright green; tentacles oblong, 

 obtuse. Corallurn very porous; cells small (1 line broad), poly- 

 gonal ; margin granulate, or irregularly denticulate. 



Port Dorey, New Guinea. Quoy <$f Gaymard. 



This species is described by Quoy and Gaymard, as occurring in 

 hemispherical masses as large as the fist. It may also grow erect 

 like the following species. 



Goniopora pedimculata, Quoy and Gay- 27. " A. glomerata, superficie reticulata, 



mard, Voy. de 1'Ast., iv., 218, pi. 16, cellis subpentagonis, contiguis, calyci- 



figs. 9-11. formibus, ad parietes striatis, fundo pa- 



, Blainville, Man., 395. pillis senis substellatis." Referred here 



Astrcea cahjcularis (?), Lamk., ii. 416, No. by Quoy and Gaymard. 



2. GONIOPORA COLUMNA. (Dana) 



G. erecta, 12" alta, compresso-cylindrica, et subclavata, 24" crassa ; 

 apice rotundata, et divisa, 2-3" animata ; polypis cylindricis, 2-3"' 

 salientibus, pallide purpureis, 1 8-24-tentaculatis. Gorallum porosis- 

 simum ; cellis angulatis, excavatis, !"' latis ; margine acutis, granu- 

 latis; infra cellis obsoletis. 



143 



