6o 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 80 



Droiiiopus vclox Matthew ' from the Lower Carboniferous of 

 Nova Scotia (see fig. 31 ), likewise appears to have its affinities within 

 this genus, and were it not for the uncertainty of the digital formula 

 of the forefoot, I should unhesitatingly refer it to the present genus. 

 The hind foot with five slender digits, digits three and four subequal 

 in length, and the first slightly divergent, are all features in common 

 with the pes impressions of the species to be described below. 



Matthew was in doubt as to whether there were three or four toes 

 in the manus of Droiiiopus vclox, but in view of the close similarities 

 noted above in the hind feet, it would seem not unlikely that five may 

 be found in this foot when better preserved specimens are known. 



Fig. 31. — Droiiwpus vclox Matthew. Tjpe. a, right hindfoot 

 impression; 3b, right forefoot impression. From Joggins, Nova 

 Scotia. Both natural size. (After Matthew.) 



Footprints from the Hermit shale, having a similar digital for- 

 mula, with slender sharp pointed toes are tentatively referred to 

 CoUettosaurus. 



COLLETTOSAURUS PENTADACTYLUS, new species 



Plate 19, fig. I 



Type. — Catalogue number 11,527, U. S. N. M. Consists of a slab 

 of shale 390 mm. in length carrying a consecutive series of tracks 

 evidently made in very soft mud. 



Type locality. — One-fourth mile west of sign post " Red Top '' on 

 Hermit Trail, head of Hermit Gorge, Grand Canyon National Park, 

 Arizona. 



Geological occurrence. — Hermit shale (about 30 feet above base), 

 Permian. 



' Proc. Trans. Roy. Soc. Canada, Vol. 10, 1904, p. 86, pi. 2, figs. 2a, 2b. 



