A REPORT ON FLORIDA CORALS. 



155 



has long proceeded does the drifting of sediment down the rivers, or the 

 washing up of bottom-sand by the outer waves, increase the bulk of the 

 islands that soon add their well-prepared areas to the general coast. 



[Note. — The reader may find published in one of the memoirs of the Museum of Com- 

 parative Zoology at Cambridge, Massachusetts, a still more complete presentation of this 

 subject, chiefly, however, from the point of view of the student of corals. The author 

 is Mr. Alexander Agassiz, who adds to his father's writings on the subject much learn- 

 ing of his own, and illustrates the whole by a series of magnificent pictures of Floridan 

 corals. The memoir to which I refer is No. 1, of volume viii., and is entitled, "Report 

 on the Florida Reefs by Louis Agassiz, accompanied by Illustrations of Florida Corals, 

 etc." It is a quarto of sixty-one pages, with twenty-three plates, and was published in 

 1880.] 





SHELL MOUNDS, FORT GEORGE ISLAND. 



