EXPLANATION OF THE CHRONOLOGICAL LIST. 



Everything relating to the history of the name is to be found in a Chro- 

 nological List of all the species of Echini having binomial names and 

 all the possible combinations under which these species occur at different 

 periods. When a name first appears, no matter if a new genus, or species, 

 or a synonyme, it is printed in a special type (Cidaris). When the same 

 name appears subsequently, it is printed in a different type ( Cidaris). Each 

 author, each paper, book, or memoir is kept separate, and receives a special 

 heading with the quotation of the book, which holds good for all species 

 arranged strictly chronologically. Thus in 



1734. 



Klein, Nat. Disp. Echinod. 



Cidaris 



toieumatica ! 



Appears for the first time, 

 appears for the first time. 



1758. 



LlNNE. 



Echinus 



rosaceus. 



Appears previously, 

 appears for the first time. 



1776. 



O. F. Mull. 



Echinus Old name. 



Drobachiensis ! ? New name. 



1778. 



Leske, Additamenta ad Klein. 



Cidaris 



papillata 



Appears before. 

 New species. 



