134 



re;ports of investigations and projects. 



BOTTOM deposits. 



The material of the bottom of the sounds within the main Hnes of the keys 

 and between the keys and the coral reefs was made the subject of as detailed 

 investigation as circumstances permitted. Series of samples were procured, 

 particularly on the inside of the main line of the keys from Miami to Key 

 West. These samples have not as yet been fully studied in the laboratory, 

 but it may be noted that siliceous sand grains formed a certain proportion of 

 the bottom material as far down as Barnes Sound, and small quantities were 

 found after entering Florida Bay proper as far down as the north side, 3 

 miles offshore, of Long Key. It may also be remarked that the Miami oolite 

 extends beneath the northeastern portion of Biscayne Bay. 



MADREPORARIA OF SOUTHERN FLORIDA. 



I have undertaken the study of the Madreporaria of the Florida region 

 particularly for the purpose of obtaining information on the variation of the 

 Madreporaria, the physical and chemical factors influencing variation, and 

 the physical and chemical determinants limiting the distribution of corals. 



General survey of the coral fields. — I began this work by undertaking a 

 general survey of the Florida reef region, and attempting to determine the 

 distribution of the various forms with reference to a number of factors. In 

 order to obtain the necessary information for these studies, I designed the 

 following field label, using a Library Bureau card, so that the data obtained 

 could subsequently be classified according to various factors : 



Carnegie Institution. 

 Investigation of the Madreporaria of the Florida Keys. 



Locality No 



Key ; side ; distance from shore 



Bottom : material ; topography 



Water : depth ; temperature ; tides 



relative purity 



Currents: direction ; rate 



Winds Breakers 



Date Collector 



Associated fauna 



Additional remarks : 



Specific collections were made at several places and all possible information 

 obtained regarding the conditions under which they lived. Turtle Reef, 

 Carysfort Reef, and the reefs in the vicinity of the Tortugas were examined 

 with as much thoroughness as circumstances permitted, and collections were 

 made at several places within the main line of keys. This material was 

 shipped to Washington, and will be studied in detail in the laboratory. It 



