Two skulls are provisionally associated with this species. One of these skulls is figured by Cope (123) on plate XXXIII, fig. 1. It is there referred to _S. scutellata_. That it can not, however, be referred to that species is manifest when the teeth are observed. In the type of _S. scutellata_ the teeth are very small, sharp denticles, while in the skull under discussion the teeth are well developed and their bases are longitudinally grooved. The teeth are elongate in the anterior part of the skull and are shorter posteriorly. They are, however, all strong. The skull is acuminate and the orbit is located about midway of its length. The jaw is slightly longer than the cranium. The structure of the cranium can not be determined in either skull, and in one only the position of the orbits and the teeth. [Illustration: Fig. 34. A. Interclavicle of Sauropleura pauciradiata Cope. × 1. (After Cope.) B. Left clavicle of Sauropleura pauciradiata Cope. × 1. (After Cope.) ] Measurements of the Specimens of Sauropleura pauciradiata Cope. mm. Length of clavicle, left 43 Width of clavicle 25 Space between ridges 2 _Large specimen No. 8657 G and obverse (13) described us Colosteus scutellatus Newb._ mm. Length of specimen, as preserved 117 Width of specimen, maximum 61 Length of forearm 9 Length of hand 10 Length of metacarpus 5 Length of clavicle 4 Width of clavicle 18 Length of interclavicle 40 Width of interclavicle 23 Width of a ventral scute 1.5 Length of scute from angle to end 35 _Skull No. 8666 C, plate xxiii, fig. 1 (Cope, 123), Colosteus scutellatus._ mm. Length of skull, as preserved 65 Width of skull 40 Diameter of orbit 6 Length of mandible 7 Width of mandible, maximum 10 Length of longest tooth 5 Width of tooth at base 1.5 _Skull Nos. 8602 G and 8608 G._ mm. Length of skull, as preserved 50 Width of skull 60 Diameter of orbit 15 Length of mandibular tooth 4.5 Other specimens associated with this species: Nos. 8668 G, 86746, 85540, 8661 G. All specimens in the American Museum and all from Linton, Ohio. Scutes of Sauropleura.