REPTILIA: CAPTORHINUS 69 



course, its specific identity cannot be determined from a single 

 specimen and the few associated vertebrae found in the bed. The 

 figures will show sufficiently well these characters and the bone 

 does not need further description. In Plate XXIV, Figs. 8-10, I 

 give several illustrations of the femur of Labidosaurus hamatus, 

 with which the Craddock specimen may be compared. 



? Captorhinus illinoiensis, n. sp. Plate XXIV, Figs. 5, 6, 7. 



A well-preserved femur among the Gurley type collections from 

 the Illinois bone-bed is shown in the cited figures. 



Its resemblance is so great to the femora mentioned above, in 

 the small digital fossa, the protuberant trochanter, the well-ossi- 

 fied articular extremities, and especially in the shape of the lower 

 articular surface, that I have little doubt the bone belongs to some 

 undetermined species of a true Pariotichid, a group never before 

 recognized from these beds. It is true that no vertebrae of the 

 peculiar pariotichid type have been recognized from this horizon. 

 Certainly the femur does not belong with Clepsydrops, as the genus 

 is now recognized, where Case has located it and figured in his 

 Pelycosauria, Plate V, Fig. 7. 



