The type specimen of the species exhibits a portion of the posterior part of the skull, a considerable part of the body, with the fore limbs and abdominal scutellæ. No vertebræ can be definitely discovered and the ribs are not distinctly visible. The cranial fragment is the upper surface of the tabulare and adjacent elements, and a broad band of the posterior parts of these is seen to be smooth, and is preceded by a slightly roughened surface. The abdominal scutæ are diamond-shaped, and are thin and light, not massive, as in S. scutellata, and are sometimes marked with a median longitudinal keel. The fore limb is large, especially the humerus, which is much dilated distally, and has a strong crest on the outer side from near the proximal end. The ulna and radius are much shorter, and more dilated proximally than distally; they are well separated. No phalanges are preserved.
The species is represented by other specimens, all of which are unsatisfactory in determining the structure of the form. A skull, apparently complete, is crushed out flat, so that little can be said of structure. The teeth are rather long, straight, acute, and striate at the base. The orbits are long and narrowed in front.
| Measurements of Sauropleura newberryi Cope. (No. 8612 G, and two unnumbered specimens, American Museum of Natural History.) | |
| mm. | |
| Length of humerus | 35 |
| Proximal width of humerus | 8 |
| Distal width of humerus | 14 |
| Length of ulna | 19 |
| Proximal width of ulna | 8 |
| Posterior width of skull | 67 |
| Width at anterior angle of orbits | 40 |
| Interorbital space | 13 |
| Width of orbit | 13 |
| Length of orbit | 27 |
| Length of a maxillary tooth | 4 |
| Diameter of same at base | 2 |
Sauropleura pauciradiata Cope.
Cope, Trans. Am. Phil. Soc., XV, p. 275, 1874.
Cope, Geol. Surv. Ohio, II, pt. II, p. 408, pl. xl, figs. 1-2, 1875.
Type: Specimen No. 8671 G, and obverse, American Museum of Natural History.
Horizon and locality: Linton, Ohio, Coal Measures.
The species was founded on a median and a lateral plate of 2 individuals. The clavicle is here associated with S. scutellata and the interclavicle thus remains as the type specimen. There are other remains associated by Cope with S. scutellata which are here shown to have closer affinities with the S. pauciradiata.
The clavicle is a right-angled triangle, the inner and thin edge concave posteriorly, the posterior convex. The ridges and grooves are well developed on the specimen. The visceral side of the element is smooth.