. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 13. Xestops vagans, USNM 16532, holotype frontals and osfeoscute. A, left lateral view of fronfals; B, the same, dorsal view; C, lateral body osteoscute. All X 4. Frontals restored partially on basis of AMNH 3919. Middle Eocene, Bridger Formation, Wyoming. cular mounds as in the frontals, but with smooth anterior gliding surfaces indicating the area overlapped by the preceding scute. The gliding surface occupies about one- third of the total length of the entire scute. A lateral overlap is also indicated betwee
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 13. Xestops vagans, USNM 16532, holotype frontals and osfeoscute. A, left lateral view of fronfals; B, the same, dorsal view; C, lateral body osteoscute. All X 4. Frontals restored partially on basis of AMNH 3919. Middle Eocene, Bridger Formation, Wyoming. cular mounds as in the frontals, but with smooth anterior gliding surfaces indicating the area overlapped by the preceding scute. The gliding surface occupies about one- third of the total length of the entire scute. A lateral overlap is also indicated between adjoining scutes by ventral and dorsal oblique surfaces along the lateral edges. Jagged lateral edges suggest some degree of suturing between osteoscutes. The scutes are keeled, the keels asymmetrical in all but middorsal scutes and extend from an anterior mesial position to the left or right corner, depending on the side of the animal from which they come. Discussion. The type of Xestops vagans consists of isolated fossil elements and the danger always exists that more than one individual may be represented. However, the remains do not include any extra ele- ments that would indicate the presence of more than one individual, and the size of the bones is also consistent with the as- sumption that they all represent a single individual. The type frontal was figured by Gilmore (1928, p. 145), and this figure was copied by McDowell (1954, p. 116, fig. 37). Gil- more figured the outline of the frontopari- etal scutes, but did not recognize the interparietal epidermal scute impression, giving the figure a pathological appear- ance. The type, however, clearly shows a triangular interparietal scute impression separating the two frontoparietals at the midline (Fig. 13b).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original w
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