Vlll PREFACE. 



defined as a genus having eight fins, the one 

 above the tail fleshy, and without spines. 



It is to be hoped M. Cuvier's new work 

 on fishes will supply accurate information on 

 this genus, which is still very imperfectly 

 known. 



Lay bach y Illyria, 

 Sept. 30. 1828. 



