TRIBE III. MADREPORACEA. 439 



Plate 31, fig. 13 a, view of cell, enlarged; 13 b, c, d, e, different 

 calicles, natural size. 



West Indies. 



This species has the general habit of the palmata, but is much 

 smaller and thinner. The margin is scarcely over an eighth of an inch 

 thick, and the flattened -incipient branchlets there apparent, show that 

 the fronds are made by the coalescence of slender branches. The 

 tubiform calicles are almost small enough to admit of being inserted 

 into the cells of the palmata. The specimens seen by the author 

 were from fifteen to twenty inches in height, and consisted of a few 

 fronds, spreading nearly horizontally. 



Mad. Jlabcllum, Lamk., ii. 447, No. 2. nata, flabellata, erecta, margine superiore 



, Blainville, Man., 390. non cristate, sed in ramulos teretes polli- 



, Deslongchamps, Encyc., 503. cem crassos subacutos, basi sua mox in 



The Heteropora flabellum, of Ehrenberg truncum conpressum confluente, diviso, 



(Gen. Ixix. sp. 2), appears to be a differ- stellulis (caliculis) inaequalibus crebro 



ent species. The following is his de- tubulosis, levibus." Perhaps the coni- 



scription: " Pedem alta et lata, expla- geral 



4. MADREPORA CYCLOPEA. (Dana.) 



M. latissimc foliata, ponderossima, frondibus expansis, lobatis, 3-6" 

 crassis, 6' vel plures latis, supra tuber culis rotundis grandibus (2-3" 

 crassis) remote sparsis. Corallum supra crebro caliculatum. 



Very broad foliate, and ponderous, fronds spreading, lobed, 3 to 6 

 inches thick, and 6 feet or more broad, with large, rounded, remotely 

 scattered knobs (2 to 3 inches thick). Corallum above, having the 

 calicles crowded. 



Wake's Island, Pacific Ocean. Exp. Exp. 



Only worn specimens of the corallum of this huge species of Ma- 

 drepore have been seen by the author. These were massive plates, 

 six feet square and four to six inches thick, which had been thrown 

 up by the waves on the shores. They were parts of a large spreading 

 species, which grew probably like the palmata, and attained a breadth 

 of at least twenty feet. The knobs of the surface are incipient 



