Vid.-Selsk. Skr. I. M.-N. Kl. 1922. No. 4. 



PL IV 



Fig. 8. A view of the depigrnented epithelium, there are well-marked spindle-shaped 

 cells in the front laver, x about 800. 



^ 



^ 



<5:Z3> 



^ 



<^Si 



tP 



eg) 





53> 



S.ivj. 



Fig. 9. A section stained by van Gieson's method. It will be seen that the dilatator is altogether 

 absent. The stroma of the iris is a finelv fibrillarv connective tissue, x 1000. 



(m:.r):i^^bMü 



(ll(^^'-^n:S 





■ci> 



V;?L 



<2^G5ri- 



e^ 



^k. 



Fig. 10. A piece of dilatator developed behind the sphincter. It will be seen that the layer 



of muscle epithelium has developed a distinct membrane of Bruch. The mvoglia fibres, which 



are found both in the contractile and in the protoplasmic part of the elements, are dark. — 



Stained bv Heidenhain's iron-hæmatoxvlin-eosin method, x 1000. 



