TRIBE III. MADREPORACEA. 437 



crassis ; margine extimo paulum laciniato J" crasso. Corallum infra 

 breviter caliculatis, caliculis nariformibus ; supra, caliculis cylindricis, 

 valde incequalibus, scepe 2'" longis et l"' latis, el apice obliquis, aliis 

 rotundo-nariformibus, aliis obsoktis ; Stella conspicud. 



Ponderous, very broad foliate ; fronds spreading obliquely, subcon- 

 volute at base, deeply lobed ; lobes often 2 to 3 feet long, and 1 J 

 broad, with a thickness of 1 to 2 inches ; outer margin a little laci- 

 niate, J an inch thick. Corallum below, short caliculate, calicles 

 nariform; above, calicles cylindrical, with an oblique apex, very 

 unequal, many 2 lines long and l broad, others round nariform, 

 and others obsolete ; star distinct. 



Plate 31, fig. 11 a, view of cell, enlarged; 11 b, c, d, e, different 

 calicles, natural size. 



West Indies, where it is a very common species. 



This widely spreading foliate Madrepora, sometimes attains a height 

 of six feet or more, with a pedicel nearly a foot in diameter. Other 

 specimens are but one or two feet high, with a few spreading fronds 

 3 or 4 feet broad, and these have given rise to the familiar name of 

 the species, Neptune's Chair. The calicles are larger and stouter, and 

 more acervate than in the akes, the lobes are much broader, and the 

 margin much thicker. 



Corattium porosum, album, latissimum, Seba's figure 3, tab. 113, and Esper's 81, 



muricatum, Sloane's Jam., i. tab. 17, fig. which is a reduced copy of Seba's, be- 



3 ; .a good figure. long to the M. alces, an East India spe- 



Mad. muricata, var., Esper, Fortsetz. i. cies ; and Ehrenberg appears to have 



tab. 51 . derived his description of the palmata, in 



Mad. palmata, Lamk., ii. 446, No. 1. part at least, from specimen's of that 



, Deslongchamps, Encyc., 503. species. 



, Blainville, Man., 389. 



2. MADREPORA ALCES. (Dana.} 



M. crasse foliata, frondibus profunde digitato-lobatis ; lobis angusto- 

 ebngatis, seu ligulatis, (scepe 2' longis, 2-4" latis, et -lJ" crassis). 

 Corallum infra caliculis brevibus confertis ; supra tubiformibus, in- 

 aqualibus, 2-2"' longis et "' latis, erectis, nunquam nariformibus, 



no 



