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Classification of Fishes 



accept the finer definition and again correctly call it Acanthos- 

 tracion tricorne. But to call it quadricornis or listeri or macu- 

 latus with any generic name whatever would be to violate the 

 law of priority. 



FIG. 2-43. Spineless Trunkfish, Lactophrys triqueter (Linnaeus). Tortugas. 



Trinomial Nomenclature. By trinomial nomenclature we mean 

 the use of a second subordinate specific name to designate 

 a geographic subspecies, variety, or other intergrading race. 

 Thus Salmo clarki mrginalis indicates the variety of Clark's 

 trout, or the cut-throat trout, found in the lakes and streams of 



FIG. 244. Hornless Trunkfish, Lactophrys trigomis (Linnaeus). Tortugas, Florida. 



the Great Basin of Utah, as distinguished from the genuine 

 Salmo clarkii of the Columbia. Trinomials are not much used 

 among fishes, as we are not yet able to give many of the local 

 forms correct and adequate definition such as is awarded to 

 similar variations among birds and mammals. Usually vari- 

 eties in ichthyology count as species or as nothing. 



