3. Photograph of amphibian footprints, Dromopus aduncus Branson, from the Mississippian shales of Giles County, Virginia. × 1/3. Courtesy of Dr. Branson. Original in the Museum at Oberlin College.
4. Photograph of type of Thinopus antiquus Marsh, the amphibian footprint from the Devonian of Pennsylvania. × 1/4. Courtesy of Dr. Lull. Original No. 784, Vale University Museum.
Cephalerpeton ventriarmatum Moodie.
Moodie, Kans. Univ. Sci. Bull., VII, No. 2, pp, 350-352, pl. 1, fig. 4; pl. 7, fig. 2, 1912.
Type: Specimen No. 796, of Yale University Museum.
Horizon and locality: Collected at Mazon Creek in 1871, near Morris, Illinois.
The remains on which the present species is based consist of an almost entire skull, 26 consecutive vertebræ, both fore limbs, 20 ribs preserved on the right side of the body, and a portion of the ventral armature ([plate 4, fig. 4]).
The skull is very broad posteriorly, its width being one-third greater than its length, with due allowance for crushing. A pineal foramen is not preserved. The sutures bounding the premaxillaries, the maxillæ, the nasals, the prefrontals, the frontals, a portion of the parietals, the squamosal, the supratemporal, the quadratojugal, and the quadrate (?) are fairly well preserved. The arrangement of these elements can be discerned by reference to [figure 29]. The prefrontals are unusually large and are triangular in shape. The supratemporal is also quite large. The surface of the skull bones is smooth and there is nowhere an indication of sculpture.