Ep 



31 



Hm 



Fig. 31 The epiphyseal complex in an old embryo of Chelydra serpentina, 

 according to Humphrey, 1894. 



Pf., paraphysis; V., velum transversum; Ds., dorsal sac; Ep., pineal organ; Cp., 

 posterior commissure. 



Fig. 32 The pineal region in an old embryo of Caiman niger, according to 

 Voeltzkow, 1903. 



Hm., hemisphere; Pf., paraphysis; Ds., dorsal sac; Ch., commissura habenu- 

 laris; M, midbrain. 



65 



MEMOIR NO. 9 



