=Palaeopeltis inornatus= Ameghino P. inornatus Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. 659. P. inornatus Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 506. The species is founded on four plates which are without ornamentation, and externally smooth except for numerous vascular perforations. They are of considerable size and entirely characteristic. The one such plate which we found is shown in fig. 134. =Glyptatelus= Ameghino Glyptatelus Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 507. The plates of the carapace are similar to those of _Palaeohoplophorus_, the O-figure being, however, nearer the rear of each plate, and the number of radial furrows being smaller, usually six. We found no specimens of this interesting form. Ameghino has made two species, _G. tatusinus_ and _G. malaspinensis_. =Glyptatelus tatusinus= Ameghino G. tatusinus, Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 507. I reproduce Ameghino’s figure of this species which shows all that is known of the form. [Illustration: Fig. 135. Four plates—natural size, after Ameghino.] =Glyptatelus malaspinensis= Ameghino G. malaspinensis Amegh., 1902, Bol. Acad. Nac. Cienc., Cordoba, t. 17, p. 50. This species is described (no figure) as about the same size as the preceding, but with subordinate figures in the central O-figure, and also outside of it. A dorsal plate measures 26 mm. long by 20 mm. wide. GRAVIGRADA Remains of this suborder are almost as rare as those of the glyptodonts, and apparently for the same reason, unfavorable habitat. We found no remains of this group, but Ameghino has described a skull and some teeth as belonging to this group; so, in order to present a complete view of the Deseado fauna, I give a digest of his descriptions. =Hapalops antistis= Ameghino H. antistis Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 505. The species is based on a skull, not figured, of which Ameghino says: the size is small, the molars are compressed from front to back, and gives the following measurements: Length of cranium from front of max. to occ. condyles 140 mm. Length of four post, molars 27 mm. Distance from front of max. to back of last molar 48 mm. =Octodontotherium= Ameghino Octodontotherium Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. 656. The genus is based on isolated teeth, each a mass of dentine surrounded by a thin layer of cement. The anterior tooth of the upper jaw is caniniform, the first molar ovoid in section, the last molar is bilobed, corresponding to _Pseudolestodon_. The first tooth of the lower jaw is also caniniform, but is two-faced as a result of wear. The intermediate upper and lower molars are rectangular prisms resembling those of _Chlamdotherium_. =Octodontotherium grandis= Ameghino O. grandis Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. 656. O. grandis Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 505.