Dr. F. Briiggemaiin on Stony Corals. 301 



A. Coral fixed to the ground, with an expanded 



base. 



a. Costse roughly spiuose 1. Scolymia. 



b. Costffi denticulate 4. Homophyllia. 



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



base. 



a. Costae roughly spinose 2. Cyxarixa. 



b. Costae denticulate 3. Antillia. 



A third mode of difFerentiating- them is this : — 



A. Calicle and columella nearly circular 4. Homophyllia. 



B. Calicle more or le^s circular ; columella oblong, 



with a longer and shorter axis. 



a. Coral cyliudro-turbiuate or columniform 1. Scolymia. 



b. Coral turbinate 2. Cynarina. 



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 Mussaceaj than to each other ; they might also be 

 shortly defined thus :-r- 



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



2. Cynarina, as a solitaiy 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. 



Caryophyllia, Milne-Edwards and Haime, Compt, Rend, xxvii. p. 491. 

 Scolymia, Haime, Mem. Soc. Geol. Fr. (2) iv. p. 279, note. 

 Lithophyllia, 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. Costa3 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 fi'om within outwards. Columella 

 oblong in outline, consisting of thin trabeculae, its surface 

 finely papillose or imbricate. 



The Lamarckian name Caryophyllia 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 Jourdau had applied 

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

 to rename the genus subsequently; the name Sculymia had 

 been published, whether by liaimc or by Jourdan liinLself is 



