In 1862, Bleeker undertook to divide these fishes differently. Placing all the hornless species, whether three-angled or four-angled, in _Ostracion_, he proposed the name _Acanthostracion_ for the species with horns, _tricornis_ being the type. But _Acanthostracion_ has not been usually adopted except as the name of a section under _Lactophrys_. The three-angled American species are usually set apart from the four-angled species of Asia, and our cuckold is called _Lactophrys tricornis_. But it may be with perfect correctness called _Ostracion tricorne_, in the spirit called conservative. Or with the "radical" systematists we may accept the finer definition and again correctly call it _Acanthostracion tricorne_. But to call it _quadricornis_ or _listeri_ or _maculatus_ with any generic name whatever would be to violate the law of priority. [Illustration: FIG. 243.--Spineless Trunkfish, _Lactophrys triqueter_ (Linnæus). 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 virginalis_ indicates the variety of Clark's trout, or the cut-throat trout, found in the lakes and streams of 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 varieties in ichthyology count as species or as nothing. [Illustration: FIG. 244.--Hornless Trunkfish, _Lactophrys trigonus_ (Linnæus). Tortugas, Florida.] [Illustration: FIG. 245.--Hornless Trunkfish (face-view), _Lactophrys trigonus_ (Linnæus). Charleston, S. C.]