BATHY METRICAL DISTRIBUTION. 



The bathymetrical distribution is exhibited on the accompanying 

 table. From it we can readily separate the species found in depths 

 less than 100 fathoms, which inhabit the region of debris between the 

 reef and the rocky plateau beginning at the above depth. They are 

 the following : — 



Parasmilia prolifera. 



Parasmilia variegata. 



Oculina varicosa (dead fragments only). 



Oculina tenella. 



Cladocora debilis. 



Stylaster Duchassaingii. 



Balanophyllia floridana. 



Mycedium fragile (found also on the reef). 

 A few others extend from the same region into the next or rocky 

 one ; but as the limit is not a sharp one, it is difficult to say if 

 they really belong to the one or the other, or were gathered by the 

 dredge from patches of rock in the muddy bottom, or muddy patches 

 in the rocky bottom. 

 They are : — 



Caryophyllia clavus. 



Caryophyllia formosa (decidedly on rock on Cuban coast). 



Leptocyathus Stimpsonii. 



Deltocyathus Agassizii. 



Parasmilia Lymanii. 



Caelosmilia fecunda. 



Lophohelia exigua. 



Madracis asperula. 



Stylaster punctatus (see remarks in description). 



Pliobothrus symmetricus. 

 The characteristic species of the rocky bottom, at greater depths than 

 100 fathoms, are : — 



Stenocyathus vermiformis. 



Thecocyathus cylindraceus. 



