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THE AMERICAN NATURALIST [Vol. XLVIII 



Terms Relating to Type Species 

 Orthotype. — Type by original designation. A species desig- 

 nated as type in connection with an original publication of a 

 generic name. A genus whose type was-formally designated at 

 the original place of publication is orthotypic. 



Ilaplolype. — Type by single reference. A single species re- 

 ferred to a genus at the original place of publication, and on 

 this account accepted as the type. A genus proposed with refer- 

 ence to a single species is haplotypic. 



Logotype. — Type by subsequent determination. The histori- 

 cal type of a genus, selected from two or more original species. 

 A genus whose type is selected from two or more original species 

 is logotypic. 



Pseudotype. — Erroneous indication of type. A species erro- 

 neously indicated as the type of a genus. A genus treated on 

 the basis of an erroneous type, or so as to exclude the true type, 

 is pseudotypic. 



0. F. Cook 



