74 COLPOPHYLLIA. 



Mceandrina clivosa Ellis & Sol. 



Maai\drma grandilohata Edw. & H. 

 Mceandrina mammosa Dana. 



The most common form is well characterized by its rather flat growth, 

 with very gibbous and tuberculated surface, very distinct calicnlar 

 centres, marked by an enlargement of the columella and convergence 

 of the lower part of the septa ; paliform lobes small, thickened, but not 

 generally connected laterally; columella very rudimentary between 

 the calicnlar centres ; secondary septa very regular, about half as thick 

 and long as the primaries. 



This species is exceedingly common in Florida, but does not in gen- 

 eral form very large masses. 



MaBandrina strigosa Dana. 



Ccdoria strigosa M.-Edw. & H. 



Dana's description agrees in every point with our most common and 

 largest Florida species. It is not mentioned in the synonymes of the 

 species enumerated by Milne-Edwards and Haime, among which none 

 can be found which agrees in its characters with our specimens. 



There are two varieties apparently. The most common one has 

 rather narrow gyri, thin walls, paliform lobes distinct but not very 

 prominent. The second form has wider gyri, wall rather thick and 

 sometimes flattened and slightly furrowed on top, making an approach 

 to Diploria ; paliform lobes very distinct. In both forms the secondary 

 septa are seldom present. A specimen in the Museum shows the tran- 

 sition from one form to the other. 



The second form has been enumerated by Professor Verrill in the 

 Bull. Mus. Comp. Zool., No. 3, as Mceandrma sinuosa Lesueur, but Le- 

 sueur's description is quite insufficient to identify the species he had in 

 view. 



COLPOPHYLLIA M.-Edw. & H. 



Colpophyllia gyrosa M.-Edw. & II. 



Rather common, but seldom seen alive in less than one fothom. It 

 is found dead abundantly on top of the reef at low-water mark. 



