TRIBE III. MADKEPORACEA. 563 



16. PORITES FRAGOSA. (Dana.) 



P grandis, arrecto-glomerata, super jide subangulata et crasse monticu- 

 losa. Corallum robustum, cellis subangulatis, paulum ezcavatis, vix 

 majusculis ('"), fundo planis; septis obtusis. 



Erect glomerate, with- the surface subangular and coarsely monticu- 

 lose Corallum having the cells subangular, shallow, rather small 

 (| of a line broad), plane at bottom ; septa obtuse. 



Plate 55, fig. 9, surface of corallum, natural size ; 9 a, cells enlarged. 



Feejee Islands. Exp. Exp. 



The general form of this species is nearly that of the conglomerata, 

 though higher in proportion to the breadth ; the cells differ in being 

 flat at bottom and separated by septa sometimes one-fourth the breadth 

 of the cell. One specimen from the Feejees measures a foot in height 

 and seven inches in diameter. There are nine or ten cells to half an 

 inch in breadth. The interior is very finely compact, and evenly so, 

 without more compact layers at intervals. 



17. PORITES LIMOSA. (Dana.) 



P. gibboso-subglobosa. Corallum robustum cellis paulum excavatis, 

 grandioribus (!"' fatis), fundo planis ; septis obtusis, tenuibus. 



Gibboso-subglobose. Corallum having the cells shallow, large ( I of a 

 line broad), plane at bottom ; septa obtuse, but thin. 



Plate 55, fig. 2, corallum, natural size ; 2 a, cells, enlarged. 



The Feejee Islands, in shallow waters, near the shores, where often 

 muddy. Exp. Exp. 



The cells of the corallum, though resembling those of the fragosa, 

 are much larger, about seven occupying an interval of half an inch. 

 The six points around the centre of the cell are quite prominent. 

 The specimen in the collections is a disk-shape mass, three inches 

 thick, and eight in diameter, with lobed sides, and having the upper 



