other light than that of a variety. The difference con- 

 lifts in the prominent undulations, which in that fpecies 

 are of a more compreffed form, fo as to rife with a 

 fharp edge ; not flattened as in the prefent fpecies. I 

 mould obferve that in the globular Madrepores are 

 often, and indeed generally, feen one or two or more 

 round orifices of confiderable diameter, and which lead 

 to cylindrical perforations in the body of the coral. 

 Thefe holes do not feem fo much owing to the natural 

 ftru&ure of the Madrepore itfelf, as to the operation of 

 other animals, fuch as Terebellse, which are fometimes 

 found imbedded in thefe tubes. 



