STUDIES FROM THE NEUROLOGICAL LABORA- 

 TORY OF DENISON UNIVERSITY. 



IX. Comparative Study of the Epiphysis and Roof of 

 the Diencephalon. Continued. 



By A. D. Sorensen, A.B. 



Fellow in Neurology. 



Since our "Historical Account" appeared a few important 

 papers have come to hand and for the sake of completeness 

 their points of interest and importance are here given. 



Kupffer (op-93) figures the roof of the diencephalon of 

 Salamandra maculosa and Rana temporaria schematically, and 

 gives the following description : In the tadpole the parietal or- 

 gan is not only separated but also considerably removed from 

 the pineal. The plexus choroideus medius is evaginated from 

 the anterior lamella of the transverse velum in a spheroidal 



Fig. 1. 



V, Vorderhirn ; M, Mittelhirn ; e, Grosshirn Epencephalon ; /, Nebenhirn 

 Parencephalon ; d, Schalthirn Diencephalon; h, Unterhirn Hypencephalon ; 

 pd, plica encephali dorsalis ; pv, plica encephali ventralis ; c, cerebellum mit 

 seiner commissure ; ca, comm. anterior: ch, chiasma opticum mit den comm. 

 post-opticae; cp, comm. posterior ; cs, comm. superior ; ep l , Vordere Epiphyse 

 oder Paraphysis ; ep 2 , Hintere Epiphyse oder Zirbel; lo, Lobus olfactorius im- 

 par ; ro, Recessus opticus ; tp, tuberculum posterius ; vt, Velum transversum 

 des Vorderhirnes ; cd, Chorda ; hy, Hypophysis; po, Parietalorgan. 



