PI. Y. 



Fig. lo. A part of Axel B.'s iris where the dilatator is well developed. Cut transversely 

 ("tangential section"). Two strengthening-bands run out into the stroma, x 80. 



Fig. II. The peripheral part of the iris without dilatator. P. c. = the beginning of a ciliary 

 process. Not depigmented. ■ 50. 



