PLATE 246. 



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THE BARN-DOOR SKATE. 



Raia laevis, Mitchiil. i^p. ()67. i 

 Drawing liy IT. L. Tnrtd, from Xn. 21577. U. S. Xational Museum. coUet^tert at Gloucester, Massachusetts. October. 1878, by TT. S. Fisb Commission. 



