302 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 48 



PAGE 



Protichnites logananns Marsh. (See pi. 49) 279 



Fig. I. Photograph of slab 4 ft. 10 in. x 2 ft. 11 in., reduced to about 

 one-eighth natural size. This slab has numerous series of 

 tracks on its smooth surface. These trails are quite unlike 

 the trails of Cliniatichiiites and evidently were not made by 

 the same kind of animal. tJ. S. National Museum, Cata- 

 logue No. 58402. 

 The specimen represented is from locality (77), Upper Cambrian, 

 Potsdam sandstone in Ausable Chasm, Essex County, New York. 



