rae 49 [Cope. 
as above mentioned, and placed in my hands, I find that the animal be- 
longs to the original B. macrorhynchus, and that the first jaw and teeth 
represent an individual of another species, which will bear the name of 
B. tuberculatus. It differs from the first named in the acute or conic form 
of the crowns of some of the teeth, and probably in the much smaller 
size. 
In addition to the generic peculiarities already mentioned, this species 
exhibits a disparity between the lengths of the centra of the lumbar and 
cervical vertebree, which is unusual; compare the measurements below 
with those given for the remainder of the same animal as above cited. 
The hypapophysis of the dorsal vertebrz are long, with parallel sides, 
and oval in section. In that one where the capitular articular face is 
near the suture of the neural arch, the articular cup is entirely round, 
and its margin flared out regularly to the capitular surface. The neura- 
pophyses are narrow, and the anterior zygapophyses directed very obliquely 
downwards. . ' 
The cervicals are not only shortened, but diminish very much in 
diameter anteriorly, and the cup continues round. The hypapophysis is 
very stout on the anterior, more compressed on the posterior vertebra. 
The neurapophysial articular faces have the usual rugose anterior and 
radiate crested posterior areas, but are short and wide, and the anterior 
area has an oblique concavity extending across it outwards and anteriorly. 
The posterior area is, however, the more deeply grooved, especially on 
the lumbar vertebra. 
The rami of the mandible ave preserved nearly entire. The large ex- 
ternal foramen between the dentary, angular, and articular bones, exists 
as also the smaller one on the inner face of the ramus. The rami are 
hollow and thin walled, though-of very stout form. The anterior teeth 
extend along the outer margin of the dentary and then cross to the inner 
side, the teeth from the twelfth to the eighteenth or last being separated, 
the first by rudimental septa the latter by mere low ridges. Six of these 
teeth are exposed without osseous wall on the inner face, and that for the 
anterior tooth is probably incomplete. The whole length of the ramus is 
about twenty-eight anda half inches. It is elevated at the position of the 
tooth usually called the inferior canine ; this may be made to appear like an 
external expansion by, rotating the ramus outwards (see Leidy Cretaceous 
Rept. U.8., Tab. IV. fig. 20). There is another elevation at the seventh 
tooth behind this point, and a concave curve to the elevation of the 
articular bone. The angle of the jaw is prominent. The cutting edge 
is rather obtuse and delicately ridged transversely ; the rest of the crown 
is rugose-striate. 
Measurements. M. 
Length ramus mandible. ..-....... 0 eee e eee neers cee 0.780 
Length series of last seven teeth.......-.-0--sse rere eee ee .160 
Depth ramus at twelfth tooth (from front)..... BB pei eat oh 084 
“ at external foramen........-..e- creer eee ceee 145 
