40 Fretp Cotumpian MuseEumM—GeEo ocy, VoL. II. 
ones forming the extreme tip of the tail; these must have been mere 
nodules of bone, without processes. (See Pl. X.) 
Several other vertebre are assigned to the caudal series, chiefly 
on the evidence of the venous foramina on the ventral side of the 
centra, though they have no facets for the chevrons. Between these 
and the continuous series, four vertebre have been intercalated; the 
number may be too great; possibly not enough. That some were 
missing is quite certain, since the change in the direction of the spine 
is too abrupt in the ones preserved. Because the tail as restored 
seems to be of about the length of some other known forms, I am 
inclined to believe. that the number of the caudal vertebra, all told, 
did not exceed twenty-five. All those preserved, except the anterior 
ones, show a nearly circular and somewhat cupped surface on each 
side for the attachment of the hemapophyses. The separate branches 
are directed downward, outward and backward. They are somewhat 
flattened and expanded distally, except the distal ones, which are 
more rod-like. The diapophyses or ribs of the connected series 
spring from near the middle of the centra dorso-ventrally, and are 
directed outward horizontally, the most posterior ones also slightly 
forward. They have a somewhat expanded extremity, with a cartilag- 
inous margin. At the beginning of the series they arise near the 
middle of the centra antero-posteriorly, but gradually approach the 
anterior margin. They terminate as free ribs on the seventh before 
the end, that is on the ninth or tenth before the extreme tip of the 
the taile The sixth has a small exogenous tubercle to represent the 
process. None of the caudal vertebra, save at the immediate base, 
have functional zygapophyses, and the tail was evidently capable of 
considerable lateral and vertical movements. There are no indications 
whatever of a terminal fin, unless the upward curvature of the tip of. 
the tail suggests such an appendage. Its use, however, could not 
have been great, since the evident shortness of the tail, and its inter- 
ference with the hind limbs would have deprived it of much service 
as a propelling organ. 
PectoraL GirDLe.—The scapu/a is of the usual triradiate shape. 
The coracoid or glenoid ramus is short and rather stout, some- 
what expanded at the extremity, with the two articular facets 
meeting in an obtuse angle, the larger, oval one for the glenoid 
articulation; the smaller, triangular one for union with the cora-_ 
coid. The dorsal ramus is narrowest, is rather stout, thickened 
on the posterior and thinned on the anterior border; it termi- 
nates in a flattened surface for attachment of a suprascapu- 
