The portion of the skull preserved shows the cranium to have had a rather acuminate snout, not blunt as in the type species. The orbit is an elongate oval, although it has the same relative position in the skull as in the other species. The nostril is indicated by an oval depression near the anterior edge of the skull. The frontals, as indicated by the sutures present on the portion of the skull which is preserved, are fully as long as the parietals. Whether they were as wide as is represented is uncertain. The postfrontals are very small bones, the sutures of which are somewhat uncertain, although they can not be far from what is represented (fig. 24, B). The postorbital is large and elongate, and is distinctive of this species on account of its unusual size, although it does not attain the same proportions as in other members of the genus. The parietals are elongate and narrow. The pineal foramen is represented by its lateral edge and its position is about midway of the longitudinal diameter of the parietals. The narrow postparietal is represented by its anterior border; as restored (fig. 24, B) it may be too long. The tabulare, also, is represented by an anterior portion and it shows this element to have the position and form which is typical of the form _Diceratosaurus lævis_. Such other of the cranial elements as are indicated are based on the relations discovered in _D. lævis_. The heavy line on the left of the drawing (fig. 24, B) represents the outline of the preserved portion. The skull, as restored, may be a little too long, and the shape of the horns is conjectural. In the orbit there are preserved 2 misplaced teeth showing longitudinal fluting. The longest tooth is about 3 mm. Measurements of the Type Skull of Diceratosaurus robustus Moodie. mm. Median length of skull, estimated 67 Posterior width of skull, estimated 78 Length of orbit 18 Width of orbit 12 Length of longest tooth 3 Width of same tooth at base 1.5 Length of postorbital 27 Width of postorbital 14 =Genus EOSERPETON Moodie, 1909.= Moodie, Jour. Geol., XVII, pp. 76-79, fig. 20, 1909. Moodie, Bull. Am. Mus. Nat. Hist., XXVI, p. 355, pl. lxiii, fig. 1, 1909. Type: _Eoserpeton tenuicorne_ Cope.