43 



PLATE VI. 



Fig. 17. Horizontal section of eye of 225 mm fetus, showing 

 hyaloid canal with hyaloid artery, and origin of vitreous fibers from 

 ciliary retina. Magnification 6 diameters. 



Fig. 18. Central portion of fig. 17 further enlarged. 



Fig. 19. Horizontal section of eye of adult pig, showing hya- 

 loid canal, vitreous fibers, and zonula ciliaris. Magnification 2.5 

 diameters. 



Fig. 20. Cross-section of hyaloid canal of 250 mm fetus, with 

 hyaloid artery in lower centre. Magnification 20 diameters. 



Fig. 21. Cross-section of hyaloid canal of 150 mm embryo. 

 Magnification 20 diameters. 



Fig. 22. Cross-section of hyaloid canal of eye of adult pig. 

 Magnified 20 diameters. 



