1878.] 41 [Rathbun. 



witli nullipore and bryozoan growths, also dead. They form beds of 

 considerable thickness in places, often more or less consolidated, and 

 are dug up to burn for lime. The species discovered among the 

 fragments are all found living in various parts of the bay, excepting 

 Musisa Harttii, which does not apparently live at present anywhei-e 

 in the bay of Bahia. This extensive accumulation of broken corals, 

 which must have been formed by the breaking off and heaping up of 

 living corals from the surface of the reef by the breakers, when the 

 reef was at a lower level, testifies to the exceeding richness of the 

 coral life at that time. Corals have apparently ceased to be reef 

 builders in the bav of Bahia. 



