486 



Spiegazione della tavola. 



Le figure sono state disegnate col sussidio della camera lucida di Abbe-Apathy 

 e coll' ingrandimento dato dall' obbiettivo semiapocromatico 1/15 di Koristka e dal- 

 I'oculare eompensatore 8 (circa 1200 diametri). 



Le prime tre rappresentano cellule di ganglio spinale di coniglio di venti giorni ; 

 la quarta e la quinta, cellule del Purkinje di cane di circa tre mesi. 



La desci'izione dettagliata 6 uel testo. 



Nota. Per motivi indipendenti dalla mia volonth le figure della tavola sono in 

 nero. E percio bene che si noti, che il colore dell' apparato reticolare 6, nei miei 

 preparati, violetto oscuro ; quelle del uucleo, viola pallido ; del nueleolo e delle zolle 

 del NISSL, azzurro ; il fondo della cellula 6 azzurro chiaro. Nei preparati si ha adunque 

 un elegante contrasto di colori, che non & messo bene in evidenza nelle figure. 



(Tafeln mit Farben werden nur beigegeben, wenn der Verf. es für unbedingt 

 nötig und sich demgemäß zur Tragung der Kosten oder wenigstens eines erheblichen 

 Teiles derselben bereit erklärt. Der Herausgeber.) 



Nachdruck verboten. 



On the Impossibility of instituting Exact Homologies between 

 the Sulci called "Calcarine" in various Primates. 



By G. Elliot Smith. 



Six years ago I published in this Journal ^) a note on "the Mor- 

 phology of the Occipital Region of the Cerebral Hemisphere in Man 

 and the Apes", which, as I explained at the time, was merely the ab- 

 stract of a memoir published simultaneously in the Records of the 

 Egyptian Government School of Medicine (Vol. II, 1904, pp. 125—170). 

 The whole object of these publications was to illustrate the extra- 

 ordinary variability in the mode of packing and folding of the area 

 striata in the brains of Man and the Apes. 



Throughout these memoirs I repeatedly insisted on the funda- 

 mental difference in the manner of folding of the area striata in most 

 human as contrasted with the majority of simian brains, and in the 

 summary of my conclusions in the "Records" (p. 167) I made the 

 following statement: "In most non-Primate mammals, in the Prosimiae 

 and in many cases in the human brain there is a definite sulcus 

 limitans anterior areae striatae mesialis or sulcus calcarinus (sensu 

 stricto). But in most Apes this sulcus is either absent or generally 

 a small insignificant furrow, submerged in a great mesial fossa, formed 

 by the complete infolding of the whole [this should have read "the 

 greater part", as the context shows] of the mesial part of the area 

 striata. The so-called "calcarine fissure" of the Apes is thus a "fossa 

 striata", whereas the anterior part of the similarly named "fissure" 

 in the humain brain is in many cases a sulcus limitans areae striatae. 



1) Anat. Anz., Bd. 24, 1904, p. 436—451. 



