HISTORICAL 



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Fig. 4. Rondelet's figure of a sea urchin, from De Piscibus Marinis, Lugduni, 

 1554. This is said to be the earliest figure of a dissected invertebrate. 



The history of the classification of the sea urchins, including Arbacia, 

 and the chronology of the nomenclature (and a comprehensive biblio- 

 graphy) are given in A. Agassiz's classic monograph Revision of the 

 Echini (1872- 1874). A good historical review is given in Bronn's Thier- 

 Reich (1904, Bd. II, Abt. 3, B. IV, p. 1002, 1007, 1321-1338), and in 

 Lambert and Thiery (1909, p. 9-21) ; a short account is given in Lan- 

 kester's Treatise on ^oology (1900, Part 3, p. 282-2-85). 



Tiedemann (18 16) added to our knowledge of the structure of the 

 sea urchin. A very detailed description of the anatomy o{ Echinus lividus 



