Dr. F. Briiggemann on Stony Corals. 301 



A. Coral fixed to the ground, with an expanded 



base. 



a. Costje roughly spiuose 1. Scolymia. 



b. Costaj denticulate 4. Homophyli.ia. 



B. Coral free in old age, with a pointed or rounded 



base. 



a. CostfE roughly spinose 2. Cynarina. 



b. Costae denticulate 3. Antillia. 



A third mode of differentiating them is this : — 



A. Calicle and columella nearly circular 4. IIomophyi.i.ia. 



B. Calicle more or less circular ; columella oblong, 



with a longer and shorter axis. 



a. Coral cylindro-turbinate or columniform 1. Scolymia. 



b. Coral turbinate 2. Cynakina. 



C. Calicle and columella decidedly bilateral, both 



of them with a longer and shorter axis 3. Antillia. 



Most of the genera exhibit more affinities to some of the 

 compound Mussaceai than to each other ; they might also be 

 i?hortly defined thus : — 



1. Scolymia, as a solitary Mrtsm without an epitheca. 



2. Cynarina, as a solitary Mussa with a thick epitheca. 



3. Antillia, as a solitary Trachyphyllia with a thick epitheca. 



4. Homophyllia, as a solitary Isophyllia with a delicate epitheca. 



I. Scolymia. 



C'aryophyllia, Milne-Edwards and Haime, Compt. Rend, xxvii. p. 491. 

 Scolymia, Haime, M^m. Soc. G^ol. Fr. (2) iv. p. 279, note. 

 Lilhophyllia, Milne-Edwards and Haime, Hist. Nat. Cor. ii. p. 290. 



Coral cylindro-turbinate, cylindrical, or almost prismatical, 

 in all ages attached to the ground by an expanded base, with- 

 out a distinct epitheca. Costai prominent, roughly spinose, 

 the uppermost spines being the strongest. Calicle shallow, 

 circular, rarely oblong, rectangular or lobate. Septa of first 

 and second cycles with their free edges lacero-dentate, the 

 teeth increasing in size from within outwards. Columella 

 oblong in outline, consisting of thin trabeculas, its surface 

 finely papillose or imbricate. 



The Lamarckian name CaryophylUa having been previ- 

 ously restricted to another genus of stony corals, J. Haime 

 proposed in 1852 to use for the present group the generic 

 appellation of Scolymia, a name which Jourdan had applied 

 to it in the Lyons Museum. There were not sufficient reasons 

 to rename the genus subsequently; the name Scolymia had 

 been published, whether by Haime or by Jourdan himself is 



