[The] "specimen shows one vertebrate footprint in fair preservation, and with it part of another of the same series. These impressions are of much interest, both on account of their geological age and the size and character of the footprints themselves. The one best preserved [fig. 12] is nearly 4 inches in length, 2.25 inches in width, and was apparently made by the left hind foot. On the inner side in front of the heel, a portion of the margin is split off, and this may have contained the imprint of another toe. The other footprint was a short distance in front, but only the posterior portion is now preserved in the present specimen. It is probably the imprint of the forefoot. "The specimen [plate 18, fig. 4] ... was ... found in the town of Pleasant, one mile south of the Allegheny River, Warren County, Pennsylvania, by Dr Charles E. Beecher, who presented it to Yale Museum, where it still remains. "The geological horizon is near the top of the Chemung in the upper Devonian. In the same beds are ripple marks, mud cracks, and impressions of rain drops, indicating shallow water and shore deposits. Land plants are found in the same general horizon. Marine molluscs also occur, and one characteristic form (_Nuculana_) is preserved in the footprint slab" (Marsh). [Illustration: Fig. 12. Copy of Marsh's drawing of footprint of _Thinopus antiquus_, from the Devonian of Pennsylvania. × 1/3.] This still remains after nearly 20 years the only evidence of air-breathing vertebrates in the Devonian of the world. =Dromopus aduncus Branson.= Branson, Jour. Geol., XVIII, No. 4, pp. 356-358, fig. 1, 1910. Type and other specimens in Oberlin College Museum. Horizon and type locality: Near the bottom of the Hinton formation in Giles County, Virginia. (Plate 18, fig. 3.) The following description of the shales and footprints are from Dr. Branson's paper cited above: "The Hinton shales, like the Mauch Chunk, seem to have been subaerial in origin and are made up for the most part of variegated shales interbedded with thin layers of argillaceous, fine-grained sandstone. The footprints occur in fine-grained sandstone, and remains of land plants are not uncommon in the same beds.