$6 Journal of Comparative Neurology. 



V. The Hippocampus in Reptilia. 



By C. L. Herrick. 



In his most instructive paper on the olfactory and hippo- 

 campal apparatus' Dr. Edinger offers many valuable suggestions 

 growing out of his own investigations and those of others. 

 With these the present writer is fully in sympathy and now de- 

 sires simply to call attention to the fact that even in his earlier 

 papers, to which Dr. Edinger refers, there existed no such dif- 

 ference as he supposes. He says "Von spateren Untersuchern 

 des Reptilien-gehirnes hat sich Koppen meiner Auffassung ang- 

 eschlossen, wahrend Herrick ein ganz anders Gebeit, die Gegend 

 caudal von stammganglion, an der Basis des Gehirnes, also 

 nicht ein echtes mantelgebiet, als " Occipito-basal nucleus" der 

 Ammons formation homologisiren mochte. " Reference is made 

 to the papers " Notes on the Brain of the Alligator," Journ. 

 Ci)icinnati Soc. Nat. Hist., 1890, and "Topography and His- 

 tology of the Brain of certain Reptiles," Journ. Comp. Neurolo- 

 gy, March, 1891. At the time when these were written (1890) 

 Dr. Edinger's paper was as yet inaccessible to me and any 

 agreement found between our views may be taken as entirely 

 independent. In both of the papers, which purported to be 

 simply "preliminary notes," very slight reference was made to 

 the literature as the comprehensive paper, now approaching 

 completion, was then contemplated, On page 141 are the fol- 

 lowing lines: "The olfactory fibres gather in the lower me- 

 dian angle ... it may be conjectured that fibres proceed 

 to the cortex of the calloso-marginal or occipital region. It is 

 probable that other and important parts of the tract are super- 

 ficial on the inferior and lateral basal areas, collecting at the 

 postero-basal margin, and sending fibres by way of the fornix 

 to the colloso-marginal region." Of course the use of the 

 word "fornix" was here a slip of the pen. On page 143, in 

 describing the cell areas, this passage occurs : "A third cell- 



' Vergleichend-entwickelungsgeschichtliche und anatomische Studien im 

 Bereiche der Hirnanatomie. Anat. Anzeiger, VIII, lo, ii. 



