PLATE 28 



Surface workings of Mole aii<l Pocket Gopher as photographed in Yoseniite Valley; 



all about % natural size. 



(I. "Subsurface'' forage run of Mole. 



/;. A Mole hill. 



c. An earth mound made by a Pocket Gopher. 



For comparative descriptions, see pp. 44, 137. 



[690 J 



