TRIBE I. ASTR^EACEA. 265 



B. GlBBOS^E AUT CYLINDRIC.E. 



14. MEANDRINA MAMMOSA. (Dana.} 



M. gibbosa et crasse mammiUata, effusa ; discis linearibus tortuosis; gyris 

 4" latis. Corallum' collibus triangulatis, apice subacutis etfere nudis ; 

 septis crassis et solidis ; famellis tenuibus, subintegris ; fossis 2-3'" 

 profundis. 



Gibbous and coarsely rnammillary, effuse; linear disks tortuous; 

 gyri \ of an inch broad. Corallum with the ridges triangular, sub- 

 acute and nearly naked at apex ; septa stout and solid ; lamellae thin, 

 subentire; fossse 2 to 3 lines deep. 



Plate 14, fig. 10, section of trench and ridges; 10 a, outline sketch 

 of surface of corallum. 



This is a remarkable species, growing in broad spreading masses, 

 with a very uneven mammillary surface, the rounded knobs being 

 often two inches across. A specimen in the Boston City Museum, is 

 a foot in breadth. 



15. MEANDRINA CYLINDRUS. (Ehrenberg.} 



M. cylindrica, erecta. Corallum collibus convexis, obtusis, lined saepe 

 angustioribus, 2-3'" distantibus, lamellis crassis, incequalibus, disten- 

 tis, alternis majoribus. 



Cylindrical, erect. Corallum with the ridges convex, obtuse, often 

 narrower than a line, 2 to 3 lines distant, lamella? stout, unequal, 

 somewhat inflated, the alternate larger. 



Ehrenberg established his subgenus Dendrogyra, for this species, 

 from the Antillas, and another (the caudex) in the Berlin Museum. 

 The cylinders are stated to be half a foot high and two inches in 

 thickness. 



Meandrina Dendrogyra cylindrus, Ehrenb., G. Ixii. subgen. ii., sp. 1. 



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