78 SIE WILLIAM DAWSON ON 



20. Hylopus Logani, Dawson. 

 [Air-breathers, p. 5. Acadian Geology, p. 353. Trans. R. S., Pt. II., 18.52, p. 653.] 

 Lower Carboniferous, Ilorton, col. Sir "W. E. Logan, 1841, M. Pineo, 1881. 



21. Hylopus Hardingi, Dawson. 

 [Air-breathers, p. 8. Acadian Geology, p. 356. Trans. R. S., I.e., p. 653.] 



Lower Carlioniferoii^', Parrslioro', eol. Dr. Harding, 1846? 



22. Hylopus caudifer, Dawson. 

 [Air-breatliers, p. 8, Fig. 3. Trans. R. S., I.e., p. liS?).] 



Coal Formation, S. Joggins, col. J. W. D. 



23. Hylopus minor, s. n. 



On a slab of sandstone in the Museum of the Geological Survey of Ottawa, collected by 

 Mr. Weston, is a series of small footprints about two cm. in diameter, with five toes, the fore 

 foot beino; a little smaller than the hind. The lentctli of the stride of the hind foot is eight 

 cm. The distance transversely from the outside of the tracks is about six cm. There is a 

 central tail-mark, and at the sides, when the animal has turned, it has left a few slight striiie 

 probably representing the ends of the lateral lapitets. These tracks are probably those of a 

 Microsaurian. I have some small slabs with similar but less perfect impressions collected by 

 Mr. Devine at the Joggins, a few years ago. 



24. Hylopus, Sp. 



Mr. Weston has also placed in the Survey collection a small slab with some footprints 

 of a different character from the above. They are merely marks of five toes, about three 

 centimetres broad, and somewhat close together longitudinally, the distance being less than 

 five centimetres. There is no tail-mark. They may be footprints of a species of Dendrer- 

 peton walking over a firm surface. 



25. Hylopus ? trifidus, s. n. 



Footprints small, trifid ; in some, traces of a fourth toe projecting outward ; footprints 

 uniform in size and close together in two rows three-fourths of an inch apart — footprints an 

 inch apart. It is just possible that this creatui'c may have been biiieil. South Joggins, col- 

 lected by Mr. Devine. 



26. Hylopus? Sp. 



Trifid, or occasionally quadrifid, tracks, with slender toes about a quarter of an inch in 

 length resembling those of modern sandpipers, but with occasional smaller tracks as if of 

 smaller fore feet. They proliably indicate some creature as yet unknown, otherwise than 

 by its footprints. South Joggins, collected by Mr. Deviin'. 



On the slabs containing these footprints, thei'e are trails of snnill invertebrate animals, 

 showing many punctate impressions. They may have been [iroduced by worms, millipedes, 

 insects or small crustaceans. 



