302 Charles R. Stockard 



Camera sketches of free-swimming fish 



Fig. 23 Normal individual. M, its anteriorly placed mouth. 



Fig. 24 Incomplete cyclops, two eyes joined and occupy the position usually taken by the mouth. 

 Fig. 25 Dorsal aspect of a perfect cyclops. Antero-median single eye. 



Fig. 26 Lateral view of same. The mouth M is forced by the eye to remain in a ventral position 

 and hangs down as a proboscis-hke structure. 



Fig. 27 Ventral view of same fish, note perfectly single eye, one lens and one pupil, ys., yolk-sac. 



