The finding of fossil footprints by Sir William Logan at Horton Bluff, Nova Scotia, in 1841 was the first evidence found of air-breathers in the Carboniferous. This discovery was noted in the proceedings of the Geological Society of London in 1842, but no name was given to the tracks at that time.

Sir William Dawson (l)2 in 1863 published a brief description and a figure of these tracks but referred to them as footprints discovered by Sir W. E. Logan. In 1882, Dawson (3) proposed the name Hylopus logani for the tracks. In a later reference to this species by Dawson (4, page 78), through a typographical error, the date of the original description was given as 1852. Hay (7, page 546) and Matthew both seem to have overlooked the paper in which the species was named. The type is in the collections of the Geological Survey of Canada, . . .

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