28 



FREDERICK TILNEY AND LUTHER F. WARREN 



in 1816 could not find it in the bony fish, while Gottsche 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 1864 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 



-Af 



7>- Sc/t Cp 



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

 1905. 



Ls., lamina terminalis; P/., paraphysis; Ds., dorsal sac ; V., velum trans versum; 

 Ch., commissura habenularis; Po., pineal organ; St., stalk of pineal organ; Tp., 

 tractus pinealis; Sch., pars intercalaris anterior; Cp., commissura posterior; M. 

 midbrain. 



round or pear-shaped body between the lobi optici. The first 

 exact description of the organ was given by Rabl-Riickhard 319 

 in 1883 on the basis of microscopic sections. Cattie 60 in 1882 

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

 teleosts, and Hill 180 in 1894 gave one of the most detailed and 

 reliable accounts of this region in teleosts, basing his description 

 on his findings in salmon. Other excellent descriptions of the 

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

 ( ? 96), 239 and Handrick ('01). 168 



