PLATE 3 



EXPLANATION OF FIGURES 



7 to 14 Successive stages showing the overgrowth of an ahiminum clamp, 

 measuring 0.25 mm. by 0.12 mm., by the epithelium of an excised gill filament of 

 the bass, Micropterus salmoides. The proliferation imitates cyst formation 

 about living glochidia. At each stage is indicated the time elapsed from the 

 beginning of the experiment. X 50. 



15 The repair of a wound made by simple incision in the excised gill filament 

 of the bass. As with cyst formation on excised filaments there is excess pro- 

 liferation. X 50. 



498 



