134 FIELD COLUMBIAN MusEUM—GEOLOGY, VOL. II. 
wanting. I suspect that the rib was single-headed here. Because of the 
small size of this rib, the large size of the exapophyses, and the very free 
union of the vertebra, as also because of the position of the notarium in 
the specimen, apparently in articulation with the first tubercle of the 
sternum, I feel confident that this vertebra does not articulate with 
the sternum, and that it is a cervical. 
Plieninger, 1. c., considers the eighth shortened vertebra in /P¥ero- 
dactylus as the first dorsal, because it bears a diapophysis. No rib was 
preserved in his specimen, and he does not state whether there is a 
parapophysial process for the rib. If a rib was present, it was doubtless 
small, since the next three pairs of ribs are found in place, and are 
“ besonders kraftig.’’ ‘The next.three or four pairs are also strong. The 
posterior ribs are slender. 
Dorsal vertebre: Pl. XUI, Fig. 1; Pl) XLIII, Fig: 7; he threcsieas 
united vertebree of the notarium, which are visible, lie with their ventral 
side uppermost, directed a little obliquely toward the left side, and are 
partly concealed beneath the sternum. The front end lies about ten 
millimeters back of the front end of the presternal process of the sternum. 
The first two centra are visible nearly wholly, the third only in part. The 
centra are flat below, concave on the lateral margins. The first has a 
concave cup margin, and on each side a stout parapophysis is continued 
into a strong rib, without clear indications of sutural union. This ver- 
tebra in the Kansas University specimen has the ribs free, and it was 
itself separable from the following centrum through its suture; it is 
figured in Pl. XLIII, Fig. 7, and has already been described. The 
parapophysis of the second notarial vertebra seems to be given off some- 
what further back, and there are indications of its sutural union with the 
rib about seven millimeters from the body. The rib is four millimeters in 
width beyond its proximal part, and a length of about thirty millimeters 
was preserved. A specimen of a notarial rib, probably the first, preserved 
with the Kansas University specimen, has a length of forty-five millimeters 
and a width of five. The corresponding rib in this specimen mtst have 
been not less than fifty millimeters in length, and probably about sixty. 
Whether the third vertebra bears similar anchylosed ribs in this specimen 
cannot be said, as they are covered by the sternum, but since the third 
vertebra in the Kansas University specimen has such, it is undoubtedly 
also the case in this. The end of a flattened rib, about twenty-five 
millimeters in length and three or four in width, is lying by the articular 
margin of the sternum, and may belong to this vertebra. 
Lying in the axis of the notarium, a convex rim of a dorsal vertebra 
has partly protruded through the thin sternum. This vertebra is doubt- 
less either in direct articulation with its preceding vertebra, or but very 
