SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 80 



British tracks are referred by Hickling to Chclichiiiis aiiibigiiiis Jar- 

 dine, but examination of Jardine's original figures of this species ^ 

 leaves much doubt as to the correctness of this assignment. If cor- 

 rect, it is of interest to note Hickling's observation that in Jardine's 



A^. 



i\\ 



^^^ 



a 



Fig. I. — Footprints from the Britisii 

 Permian which can be properly re- 

 ferred to the genus Laoporus. A, fore 

 and hindi tracks ; B, manus. All after 

 Hickling. About 2 natural size. 



Fk;. 2. — Laoporiis iiohici Lull. A, 

 outline of manus track. Paratvpe. 

 No. 8422, U. S. N. M. B, C, manus 

 and pes track of No. 11,122, U. S. 

 N. M. All about \ natural size. 



specimen, " the fifth digit is nowhere shown," and it is a condition 

 often observed in the trackways of the American Laoponis. 



OCTOPODICHNUS DIDACTYLUS Gilmore 



Octopodichiuis didactyliis Gilmore, Charles W., Smithsonian Alisc. Coll., 

 Vol. 80, No. 3, 1927, p. 31, pi. ID, fig. 2, text fig. 13. 



Recently in bringing together all of the miscellaneous fossil foot- 

 print materials in the U. S. National Museum, the accumulation of 

 many years, a small slab (No. 2367) was found on whose surface 

 there was a trackway that is clearly referable to the genus Octopo- 

 dichnus and provisionally to the species 0. didactylus Gilmore. The 

 specimen is of interest as being the third recognizable specimen found 

 of this species and also from the fact of its coming from a new locality 

 for tracks, thus greatly extending their known geographical range. 



The specimen was collected by the late Dr. Charles D. Walcott 

 from the Coconino sandstone on the Grand View Trail, Grand Can- 

 yon National Park, Arizona, in 1903. This discovery antedates by 

 12 years the finding of quadruped tracks in the Grand Canyon by 

 Schuchert and by nearly a quarter of a century the discovery of the 

 type specimen (No. 11,501 U. S. N. M.) on which the above genus 

 and species was established. 



The considerably smaller size of the trackway and slight dififerences 

 noted in some of the individual imprints suggest the possibility of 



' Ichnites of Annandale, 1853, pis. 6 and n. 



