FREDERICK TILXEY AXD LUTHER F. WARREN 



in 1816 could not find it in the bony fish, while ( iottsche 154 in 

 1835 found it in these animals, but thought that it was connected 

 by blood vessels or a membrane with the ganglion habenulae 

 and the commissura habenularis. Mayer in 1S64 265 gave a 

 description of the epiphysis as being merely a vascular convolu- 

 tion in the roof of the interbrain, while Owen 294 in 1866 was not 

 at all sure of its existence even as a vascular convolution of the 

 roof-plate. In 1870 Baudelot 14 described the epiphysis as a 



vf 



Tp Sch Cp 



Fig. 3 Schematization of pineal region in Teleosts, according to Studnicka, 

 1905. 



/>.s-.. lamina terminalis ; Pf., paraphysis; Ds., dorsal sac; P., velum trans versum; 



('h., ronmiissura habenularis; Po., pineal organ; Si., stalk of pineal organ; 7'/'., 

 tr;ietus pincalis; Sch., pars intercalates anterior; Cp., commissura posterior; M. 

 midbrain. 



round or pear-shaped body bet \veen the lobi optici. The first 

 exact description of the organ was given by Rabl-Riickhard 819 

 in ISXo on the basis of microscopic sections. Cattie 60 in 1882 

 described the gross appearances of the organ in a large number of 

 leleosis, and Hill lso in 1894 gave one of the most detailed and 

 reliable accounts of this region in teleosts, basing his description 

 on \\\> findings in salmon. Other excellent descriptions of the 

 onfall in teleosts have been given by Ussow ('82), 402 Leydig 

 '96 . and Ilandrick ('(I! 



