TRIBE III. MADREPORAC E'A. . 5Q3 



Feejee Islands, Mathuata, Island of Venua Lebu. Exp. Exp. 



This species resembles the preceding, but is much more minutely 

 spinulous, and the polyps are very different. The margin, moreover, 

 is thick, and is folded under instead of being reflexed ; and the cells 

 near the margin are entirely immersed. 



III. Cellis coralli immersis, superficie non lene papillosd, sed valde irregulari. 



18. MANOPORA INCRASSATA. (Dana.) 



M. crasse explanata (J"), paulum undulata, parce lobata, superficie an- 

 gulate salebrosa, et gibbosa. CoraUum vix fragile, non spinulosum, 

 cellis numerosis, '" latis, undique sparsis, interdum marginatis, 6-12- 

 radiatis. 



Thick explanate ( an inch), a little undulate, sparingly lobed ; sur- 

 face angulately rough, or covered with very irregular polygonal 

 prominences. Corallum hardly fragile, not spinulous, cells nume- 

 rous, ^ of a line broad, every where scattered, some with an elevated 

 margin, 6 to 12-rayed. 



Plate 47, fig. 1, corallum, natural size. 



Feejee Islands. Exp. Exp. 



The broad plates are half an inch thick, nearly flat, and have a very 

 uneven hackly surface ; the angular prominences are from one to four 

 lines high, but sometimes rise to an inch or two, with a breadth of an 

 inch. The cells are rather large, and are about a line apart. The 

 margin of the corallum is rounded ; below it is alive for an inch or 

 two from the edge, with a smooth surface and numerous immersed 

 cells. 



The Montipora verntcosa, of Quoy and Gaymard, Voy. de 1'Ast., iv. 247, pi. 20, fig. 

 11, may be identical with this species. The figure is a doubtful one. 



The Porites complanata, of Lamarck (ii. 439), is imperfectly described as follows, and 

 may be near the above: "In laminam partim liberam explanata; superna superficie sub- 

 undata, stellifera ; cellis exiguis, immarginatis." " Du voyage de Peron et Lesueur." 



