EXPLANATION OF PLATE I. 
Fig. I. — Photograph of a female specimen of the typical form of Trygon uarnak which 
measured 5 ft. 3 in. across the disk. 
,, 2. — Photograph of a female specimen of T. uarnak var. variegatus which mea- 
sured about 5 ft. across the disk. 
,, 3. — Photograph of the type specimen ( 9 ) of Trygon favus. This specimen mea- 
sured 4 ft. 4 in. across the disk. 
