of the Island of Trinidad , W. I. 11 



assisted bj tlie kindness of Mr. J. Carson Brevoort, who allowed 

 us the use of his extensive and well assorted library, which sur- 

 passes in the number and value of ichthyological memoirs and 

 volumes, any other in New York. The officers of the Smith- 

 sonian Institution of Washington have also enabled us to consult 

 the library of the Institution. 



Specimens of most of the species which are herein described 

 have been deposited in the museum of the Smithsonian Institu- 

 tion, and in the private cabinets of Messrs. Steward and Bre- 

 voort. 



vn. 



"We will now proceed to describe the genera and species re- 

 presented in the Island. The classification which we have 

 adopted is a modification of that of the late Dr. Johannes 

 Miiller. 



Sub-class. 

 Teleostei, ITIuller. 



Order. 

 ACANTHOPTERYGII, Artedi, Cuv. 



Family. 

 ScLENiDiE, Cuv. 



Subfamily, 



POLYCENTRIN^, GlLL. 



Genus. 



POLYCKNTKUS, MuLL. AND TkOSCHEL. 



Body ovate, compressed, covered by moderate ctenoid scales. 



