THE PINEAL BODY 



79 



striking characteristics as to make it one of the most prominent 

 and important elements in the epiphyseal complex. Its appear- 

 ance in cyclostomes is almost as striking as the pineal end- vesicle, 

 but its tendency to irregularity is noted by a complete absence 



P.O. 



KM. 



O.C. 





Fig. 14 Reconstruction showing the development of the pineal region of a 

 sheep embryo of 48.4 mm., according to John Warren, 1917. 



' F.M., foramen of Monro; P., paraphysis; V., velum; S.C., commissura hi 

 ularis; E., epiphysis; P.O., posterior commissure. 



