336 NAME OF SPECIES 



^ The genus, 3fussa, as here restricted, inckides both Miissa and Sym- 

 phyllia of JNIihie-Edwards and Haime, — different specimens of the same 

 species sometimes dififei-in<^ in the same way, and to the same extent, as do 

 these two so-called genera. The only difference given, is dependent upon 

 the mode of growth. 



2 It is probable that this, and some of those following it, are only varie- 

 ties of one species. 



2 The name Orbicella is now restricted to the genus of which O. annu- 

 laris and 0. cavernosa are types. This group is equivalent to Heliastrcca 

 ot Edwards and Haime, of more recent date. 



"* The genus, Aslrcra, is here restricted to the group of which A. rotulosa 

 is the type. This was the original type named by Lamarck, in i8oi, when 

 the genus Astrcea was first established. The genus, thus limited, is equiva- 

 lent to Favia of Oken, 1 815. 



^ The genus, Undaria, is equivalent to Pachyseris Edwards and Haime, 

 of later date. 



^ Ca:nopsa7nmia is recombined with Dendrophyllia, because in certain 

 species part of the corallets have the structure of the former genus, and 

 others that of the latter, even in the same specimen. The only distinction 

 made is that the farmer genus has a smaller number of lamellae, — a charac- 

 ter that is by itself seldom of generic value. 



■^ The genus, Antipathes, as here adopted, includes Cirrhipathes, AracJi- 

 ttopaihes, and Rhipidopathes of Edwards and Haime. Those divisions were 

 based only upon the modes of growth and branching, which are quite 

 insufficient for establishing genera among Polyps. 



