ION 



FREDERICK TILXEY AND LUTHER F. WARREN 



13. Coregonu* albus. Hill ('91). 179 In the embryonic state 

 of this species the anlagen of the pineal and parapineal organs 

 both occur. 



14. ('(liaxli.trnis feres. Hill ('94) I8 found the anlagen of the 

 anterior and posterior epiphysis in embryos of this form. These 

 were almost transversely placed in relation to each other. 



Kiii. ">(> Transverse sect ion t hroujili t lie end -vesicle of 1 lie pineal oruan in Leu- 

 riscus riitilus, according to Ralil-Riickhanl, 

 l'ii.. pineal or^ini; /////., lieiiiis|ilieres. 



IT), ('ohm* ./V/.s-.s/V/.s and Imrh.iluhi. Studnicka ClMi). 386 The 

 pineal oru,;in in these sp(H'ies is tubular. The distal (Mid forms a 

 lariie sac which lies beneath the skull. The tra.ctus pinealis is 

 present. 



