326 



PAPERS FROM THE DEPARTMENT OF MARINE BIOLOGY. 



varied and comprises corals of inner flat, reef, and deeper water facies. 

 Among the species are Eusmilia fastigiata, Oculina diffusa, Orbicella annu- 

 laris, Favia jragiim, Manicina gyrosa, Mceandra areolata, M. clivosa, M. 

 strigosa, Mycetophyllia lamarckana, Agaricia purpurea, Porites porites, P. 

 furcata, P. astreoides, and Millepora alcicornis. There is more suspended 

 matter in the water of the moat and outside the floodgate when the water 

 has been agitated than under the wharf; and the table shows that the 

 temperature range at the latter two stations is greater than at the former. 

 The inner flat corals are especially resistant to the deleterious eflfects of 

 sediment, and can survive a wide range of temperature. 



Records of temperature of surface tvater at Fort Jefferson, Tortugas, Florida, 

 from June 16, 191 1, to June 16, 1912. 



STATIONS AT FORT JEFFERSON. 



