99 
oo- MEMOIRS OF THE CARNEGIE MUSEUM 
to the ninth cervicals have a vertical ridge connecting the di- and parapophyses on 
the anterior margin of the centra. This character may also prove to be a feature 
of this species. 
The anterior or median dorsals have two well defined apophyses (See Fig. 13) 
placed well down on the anterior margins of the centra. The diapophysis is the 
Fic. 13. Lateral view of anterior or median dorsals of Buptanodon 
robustus (No. 919). Typespecimen. Onehalfnaturalsize. d., dia- 
pophysis ; p., parapophysis; s., spinous process; a.zyg., anterior zyga- 
pophysis ; p.zyg., posterior zygapophysis. 
larger of the two. In these verte- 
bree the pedicels of the upper arches 
are extended antero-posteriorLy, 
being nearly as wide as the centra 
upon which they rest. The spines 
are somewhat compressed  later- 
ally, and very high. The arches 
in what is considered the anterior 
dorsal region are held together by 
single zygapophyses, which are of 
considerable extent obliquely. 
The pedicels do not project later- 
ally asin some of the Ichthyopter- 
ygians but form a smooth surface 
with the upper lateral surfaces of 
the centra. 
The series of posterior dorsals 
appear very similar, except in size, 
to those from this region of B. dis- 
cus. The single apophyses pos- 
teriorly recede to the lowermost 
border of the centra as in the other 
species. 
The parts of caudals preserved, 
besides showing the rapid decrease 
in size posteriorly, appear to have 
parts of several chevrons retained in the matrix near them and furnish the first evi- 
dence of these bones in Baptanodon. 
All of the vertebree are deeply biconcave as in other members of the genus. 
