222 Journal of Comparative Neurology. 



§31. Derivative. — A -word derived or formed either im- 

 mediately or remotely from another ; e. g. , inorganic, organise, 

 and organs are derivatives of organ. 



§32. Correlative Names. — These are derivatives containing 

 no obvious locative element but intended to indicate some re- 

 lation between the part so designated and the part designated 

 by the base ; e. g. , fissnra calcariiia associates an ectal fissure 

 with the calcar, an ental ridge. 



§33. Eponyms. — Personal names, i. e., derived from the 

 names of individuals; e. g. , fissnra Sylvii ; pons Varolii. Some 

 objections to these are stated in W. & G. , '89, §59/ and as 

 they are condemned by the German committee most of them 

 will probable disappear. An exception perhaps should be 

 fissnra Sylvii (see §120). 



§34. Pecilonymy.- — Proposed by me (W. & G., '89, §16) 

 as a mononym for terminologic variety or inconsistency within a 

 single article or work ; e. g. , the use of fissni'a and sulcus for 

 the same cerebral furrow, of centralis and Rolando for the same 

 fissure. Between pp. 464 and 507 of Schwalbe's " Neurol- 

 ogie " occur Cms fornicis (498), Fornix-scJienkel (464), Fornix- 

 sdnlchen (507), Gewolbe-selienkel (464). His ('95) adopts Fora- 

 men i?iterventriculaic but uses Foramen Monroi on p. 166 and 

 " Monro' scJien Locke'' on p. 167. 



§35. Direct Pecilonymy. — In the cases mentioned above 

 and others that might be adduced from nearly every work 

 known to me, one and the same part is designated by two or 

 more substantives or words used substantively. This is direct 

 pecilonymy . A special variety of it occurs when different gen- 

 eric names are applied to two homologous parts ; e. g. , in Hux- 

 ley and Hawkins' " Comparative Osteology" the arm is called 

 the " anterior extremity''' the leg, the " hind limb." 



' There may be added the liability of misspelling ; Monro has been spelled 

 Monroe, Munro and Munroe ; see my paper, '80, i«'. 



^ From TtoiuiXo'i, various, changeful, inconstant; compare itoiuiXoliovXo'z, 

 of changeful counsel ; pecilopoda, various footed. The unfamiliar term is per- 

 haps the less objectionable in that it stands for a habit which may ere long be 

 eradicated. 



