4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 8o 



discovered locality on the Yaki Trail. More extended exploration of 

 the Hermit Trail locality shows that tracks are abundant on both 

 sides of the trail wherever physical conditions are such as to allow 

 search being made for them. The track called Laoporus nohlei Lull 

 is the predominating species and is apparently present wherever 

 tracks are found. Footprints of several of the species described in 

 my former paper \vere recognized in the field, but only exceptional 

 examples of these were collected as the object in mind was to secure 

 as many diflferent kinds as possible, in order that the complete fauna 

 might be made known. In this we were successful to the extent of 

 procuring specimens sufficiently well preserved on which to base three 

 genera and ten species all new to the fauna, thus nearly doubling the 

 faunal list ; but, as stated before, it is quite apparent from a study of 

 the new materials that a considerable number of undescribed forms 

 may yet be found. 



The ichnite fauna of the Coconino now consists of the following 

 described genera and species : 



V'ERTEBRATES 



Agostopus matheri Gilmore 

 Agosfopus medius n. sp. 

 Agostopus robustus n. sp. 

 Allopus ? arizonae Gilmore 

 Amblyopus pachypodus n. gen. and sp. 

 Barypodus palmatus Gilmore 

 Barypodus tridactylus n. sp. 

 Barypodus metszeri n. sp. 

 Baropus cocon'moensis n. sp. 

 Baropezia eakini Gilmore 

 Dolichopodus tetradactylus Gilmore 

 Laoporus nohlei Lull 

 Laoporus schucherti Lull 

 Laoporus coloradoensis (Henderson) 

 Nanopus merriami Gilmore 

 Nanopus maximus n. sp. 

 « Paleopus rcgularis Gilmore 



INVERTEBRATES 



Mesichnium betijamini Gilmore 

 Octopodichnus didactylus n. gen. and sp. 

 Paleohelctira tridactyla Gilmore 

 Triavestigia niningeri n. gen. and sp. 

 Unisulcus sinuosus n. sp. 



In the Coconino formation, fossil tracks are now known to occur 

 at three distinct localities. On the Hermit Trail some little distance 



