1922. No. 4- MIOSIS CONGENITA SEü MICROCORIA FAMILIARIS. 27 



the region behind the sphincter-rudiment disappears at a certain age, and 

 he believes "dafà die Entstehung und Heranwachsen der Sphincteranlage 

 auf Kosten "des vorderen Epithels geschiet, und zwar so dafe in der Regel 

 die vorderen Teile der Epithelzellen nach Verschmelzung mit einander mit 

 der Anlage einverleibt werden, dafa aber auch eine nicht geringe Zahl 

 Epithelzellen dabei ganz untergeht." Eorsmark also emphasises strongly 

 the fact that at a certain point of time there is no distinct boundary between 

 the sphincter and the front layer of epithelium in that region. 



If, therefore, future examination of irises of persons with this anomaly 

 should prove that the pupillary part of the dilatator was developed, a new 

 light would be thrown upon thé embryology of the musculature of the iris, 

 as in that case the fact that there is a peculiar co-relation between the 

 sphincter and the pupillary part of the dilatator would be established. 



The above work has been carried out in the Anatomical Institute 

 of the University of Christiania. The drawings have been made by the 

 draftsman of the Institute, Miss S. Morch. 



