i8 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 80 



Genotype. — Laoponis sehncJicrti Lull. 



Two species, L. sehuchcrti and L. nohlei, were described by Lull 

 from the Coconino formation, but only a single specimen of the 

 former species has been recognized in my collections although the 

 other occurs in great abundance. 



Fig. 6. — Laoponis tinhlri. No. 11,494, U. S. N. ]\I. Diagram of 

 a portion of the trackway to show the relatively long median toes 

 of the manus. No indication of the fifth toe of the pes in this 

 trackway. About j natural size. 



LAOPORUS NOBLEI Lull 



Plate 4, fig. 2 



Laoporns nohlei Lull, R. S., Amer. Journ. Sci., Vol. 45, 1918, pp. 339-.34I. 

 pi. 2, text fig. 2. 



Footprints of Laoporns nohlei Lull are by far the most abundant 

 of all the animal tracks found in the Coconino sandstone. Usually 

 the trackway of this species can be recognized at once by the uniform- 



