In the series of detached vertebræ, one (Pl. V. figs. 6 & 7) indicates by its neural spine and hypapophysis a position at the base of the neck. The centrum is barely an inch in length; its anterior surface (ib. fig. 7, _c_) is narrow vertically, broad transversely; both fore and hind surfaces indicate freedom and extent of flexure. The hypapophysis has a broad, bituberculate base (ib. _hy_), but is limited in fore and aft extent to the middle third of the under surface of the centrum: its length is shown in fig. 6, _hy_. The parapophysis (fig. 7, _p_) is slender, and expands at both attachments, with an indication of a terminal surface. The diapophysis (_d_) has a larger costal surface: it sends forward a convex ridge midway between the di- and zygapophysis (_z_). The neural canal (fig. 7, _n_) has wider and more fully elliptical outlets than the hinder dorsal vertebræ, in relation to the greater extent of motion at the fore part of the series. I conclude that a free pleurapophysis (_pl_) existed, indicating the present to be the first of the dorsal series, as shown in Pl. III. The neural spine is short, broad, obtusely pointed, with a vertically oblong syndesmotic surface (fig. 7) before and behind. Each postzygapophysis (fig. 6, _z′_) supports an anapophysial tubercle (_a_). A cervical vertebra from a position just in advance of the above has lost the neural spine, but retains the hypapophysis. This process (ib. figs. 8 & 9, _hy_) is compressed and directed obliquely downward and forward for an extent of 6 lines; the extremity is rounded: the length of the centrum of this vertebra is 1 inch 3 lines; the anterior articular surface is longest transversely, and concave in that direction, convex vertically; the proportions and curvatures are transposed in the posterior surface (fig. 9, _c_). The parapophysis (ib. _p_) is continued from the anterior border of the centrum to the middle; it is a depressed plate, confluent with the rib (ib. _d_). The diapophysis forms a short, obtuse projection above its anchylosis with the rib (ib. _pl_): this projects backward 7 lines in length, terminating obtusely, and circumscribing a vertebrarterial foramen (ib. _v_) of a full elliptic shape, 5½ lines in long diameter. The surfaces of the præzygapophyses (_z_) are larger, and look more upward and less inward, than in the preceding and the dorsal vertebræ: they are very slightly concave. Those of the postzygapophyses (fig. 8, _z′_), with a downward and slightly outward aspect, are in a similar degree convex. The neural canal, as usual in the cervical series, expands at its outlets, most so posteriorly (fig. 9, _n_); the middle of the upper surface of the neural arch is impressed by an elliptical, rough, ligamentous surface, which slightly rising in the middle is the sole indication of a neural spine. The upper surface of each postzygapophysis developes a tuberous anapophysis (figs. 8 & 9, _a_).