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



PI. V. 



Fig. II. A section at the transition from the pupillary to the intermediary part of the iris. 



Quite to the left — answering; to the intermediary zone — there is a long spindle-shaped cell 



which contains no myoglia fibres, while quite to the right — answering to the pupillar\- zone — 



it will be seen that a typical dilatator has developed, in which there are myoglia fibres. 



X 1000. 





Fig. 12. A transverse ("tangential") section through the intermediary zone. The section is 

 not completely depigmented. In front of the somewhat irregular epithelium, on the left, there 

 are some transversely cut muscle fibres belonging to the dilatator, but these become fewer 

 towards the right, and more places appear in which the epithelium therefore lies in direct 

 contact with the peculiar, almost cell-les stroma, the ground-substance of which resembles 

 mucoid tissue. The organ depigmented /;/ fofo, and section stained b^' Heidenhain's iron- 

 hæmatoxylin-eosin method, x 1000. 



