Leidy (Trans. Wagner Free Inst., vol. II, p. 27) stated that a first phalanx of _Megalonyx jeffersonii_ was among the fossils collected along Peace Creek. It was probably found on the sand-bar at Arcadia. Among the fossil vertebrates described by Leidy, the paper just cited included some dermal plates which he referred to the genus _Glyptodon_. Two of these plates were figured (op. cit., plate IV, fig. 9; plate VI, fig. 1) as those of _G. petaliferus_, a species based on half of a dermal scute described by Cope from southwestern Texas. The dermal scute shown on Leidy’s plate IV appears to be indistinguishable from similar plates which have been referred by the present writer to Cope’s _G. petaliferus_ (Proc. U. S. Nat. Mus., vol. LI, 1916, p. 107, plates III to V). The scute represented by Leidy on his plate VI appears to be far less extensively pitted than any of those of the specimen just referred to. On Leidy’s plate V are two views of a scute which he thought might have belonged on the tail of a glyptodon. It will be observed that this scute has a beak distinctly set off from the body of the scute. Among the few caudal scutes of the specimen which the writer described none presents such a beak, but such may have existed. It seems probable, however, that there was a single species of _Glyptodon_ found on Peace Creek and that it was different from _G. petaliferus_. Leidy thought that these caudal scutes resembled those on the tail of the South American _G. asper_; but Burmeister’s figures do not indicate exactly such keeled scutes. It is most probable that the Florida species requires a new name. It is to be called _Glyptodon rivipacis_ Hay. Leidy referred another dermal scute to some glyptodont animal (op. cit., plate VI, figs. 2, 3), but its nature is doubtful; it may even belong to one of the large species of _Testudo_. A conical bone (plate III, figs. 10, 11) belonged pretty certainly to _Testudo_. In the paper cited Leidy described and figured (p. 24, plate III, figs. 3 to 6) plates of an armadillo-like animal to which he gave the name _Glyptodon septentrionalis_. It is now known as _Chlamytherium septentrionale_. Leidy had over 30 of these dermal scutes which had been found at Arcadia. They are now in the Wagner Free Institute at Philadelphia. Sellards (Amer. Jour. Sci., vol. XL, 1915, p. 143) states that there are 3 dermal plates of this animal in the U. S. National Museum. In 1915 (Florida Geol. Surv., vol. VII, pp. 77, 78, plate on p. 114) he described a lower jaw, a tooth, and 2 dermal plates of the same animal.