PAL.EOZOIC AIE-BEEATHING ANIMALS. 77 



behind the condyles ; parietal foramen small ; orbits large ; length of longest tooth seen 7 

 ni.m. ; cranial bones closely and deeply pitted ; humerus with very thin bony walls, carti- 

 laginous within, 3"5 cm. long. 



Erect tree, Coal Formation, South Joggius, col. P. W. MclSTaughton. 



(Incert^ Sedis.) 



Genus Eosaurus, Marsh.' 



Eosaurus Acadianus, Marsh. — Known by two biconcave vertebrae 2*4 inches in diameter 

 and much resembling the caudal vcrtebrie oï Ichtlujosaiints — see paper by Prof. Marsh, Silli- 

 man's Journal, vol. xxxiv. 



16. Eosaurus Acadianus, Marsh. 

 [Am. Jour. Sci., vol. xxxiv. Air-breathers, p. 58. 1861, Acadian Geology, p. 382.] 

 Coal Formation, S. Joggins, ISTova Scotia, col. Prof 0. C. Marsh, 1855. 



(Species known by footprints only.) 



Some of these may be identical with species known by osseous remains ; but it is im- 

 possible to be certain as to this. 



Genus Sauropus, Lea. 



Large plantigrade animals, probablj' Labyrinthodonts or allied. Hind foot usually the 

 larger, iive toes. 



17. Sauropus unguifer, Dawson. 

 [GeoL Maga, vol. ix., 1872, p- 251. Acadian Geology, 3rd éd., supplement, p. 62. Trans. K. S., II., 1882, p. 651.J 



Millstone Grit, Fillimore's Quarry, R. Philip, col. Albert L. Hill. 



On the same slabs with this species there are footpirints of another animal of about halt 

 the size and with shorter feet. 



18. Sauropus Sydnensis, Dawson. 

 [Acadian Geology, p. 358. Trans. R. S., II., p. 652.] 



Coal Formation, Sydney, C. B., col. R. Brown. 



19. Sauropus antiquior, Dawson. 

 [Trans. E. S., Pt. 11., 1882, p. 652.] 



Lower Carboniferous, Parrsboro', col. F. M. Jones. 



Genus Hylopus, Dawson. 



Smaller footprints, digitigrade, and made by animals having a long stride and hind an<l 

 fore feet nearly ecpial. Five toes. Probably footprints of Microsauria and possibly of 

 Dendrerpeton. 



' Systematic position uncertain. May be Amphibian or Enaliosaurian. 



