TRIBE III. MADREPORACEA. 497 



Broad foliato-explanate at base, a little convex, with a somewhat lobed 

 or undulated margin, and J of an inch thick ; bearing above a few 

 very stout erect stems, gibbously divided and tuberose, never an- 

 gular. Corallum fragile, every where densely spinuloso-asperate, 

 even over the summits; spinules slender and fragile, a line long; 

 cells immersed, ^ of a line broad, very distinctly 6-rayed ; under 

 surface of the corallum naked. 



Plate 44, fig. 5, corallum, natural size. 



Singapore, East Indies. Exp. Exp. 



The foliate base in the specimen collected, measures fourteen inches 

 by nine in breadth, and one of the glomerate branches rising from the 

 upper surface is six inches high, and, where thickest, nearly three 

 inches through. They are often smaller at base than some distance 

 above. The coral is very porous and covered quite evenly with the 

 spmuliform papilla? as well at apex as elsewhere. 



Porites spumosa, in part, of Lamarck, ii. 440. 



10. MANOPORA FOLIOSA. (Ehrenberg.) Dana. 



M. explanata, concava, nunc convoluto-foliacea, nunc tuberculoso-subra- 

 mosa, scepius crispa. Corallum porosum, spinuloso-asperum, cettis 

 exiguis, incequalibus, obvallatis, interdum tubuli instar ; superfaie 

 inferno, plana, (zquabili. 



Explanate, concave, either convoluted-foliate, or tuberculoso-subra- 

 mose, usually crispate. Corallum porous, spinuloso-asperate; cells 

 minute, unequal, surrounded by a prominent border, and sometimes 

 subtubular ; under surface plane and nearly even. 



The Red Sea. Ehrenberg. 



This species, as described by Ehrenberg, resembles the hispida ; 

 but differs in its obvallate cells, its more commonly foliaceous forms, 

 concave above instead of convex. 



M. Porites foliosa, Ehrenberg, op. cit., Gen. Ixx., sp. 13. 



The Madrepora patiniformis of Esper (Pflanz. Fortsetz. i. 94, tab. 75, figs. 1, 2, 3, 

 and 56, figs. 1, 2), is either identical with this species or still another Manopora. It is 

 described by Esper as occurring in broad, concave, explanate, or foliaceous forms, with 



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