DESCRIPTION OF FIGURES 3 AND 4 



Rbtologk appeanuicr of papUlonus in th« common sucker, Catostomus commersontm. 



Pio. 3.— Cdktkr fittail from the center of the papillary Fir.. 4. — A delicate, vascular strand of loose connective 



frowtk. TW cpklwIW character of the tissue is evident. tissue is surrounded by solid masses of epithelium. The basal 



Sone of the ccfls have acquired a spindle shape, others are layer of the iteoplastic epithelium is composed of columnar 



airmatrd in saaU nrttA, suggnUve of early "pearl" forma- cells. Mag. X 80. 

 ikML Mac. X 300L 



714 



