Puate VII. 
Puate VIII. 
PLATE IX. 
PLATE X. 
PuatTE XI. 
Prate XII. 
GILMORE: OSTEOLOGY OF BAPTANODON (MARSH) 129 
EXPLANATION OF PLATES. 
Diagram showing the position of the elements of specimen No. 878, Baptanodon 
discus, as they lay imbedded in the concretion. The irregular line surrounding 
the bones represents the outline of the concretion. at., atlas ; co., coracoid ; cl., 
clavicle ; h., humerus ; 7.cl., interclavicle ; ., paired neural arch of atlas ; 0.0ce., 
occipital condyle; 7., ribs; s., spinous process of the vertebre ; sc., scapula. 
Side view of skull of Baptanodon discus, Marsh (No. 878). One fifth natural 
2. 
bo 
bo 
co 
size. Restored. ag., angular; d., dentary;j., jugal; la., lachrymal ; ma., maxil- 
lary ; na., nasal; nar., narial opening; occ.c., occipital condyle; pa., parietal ; 
pmx., premaxillary ; prf., prefrontal (?); ptf, postfrontal; pto., postorbital ; 
qj. quadrato-jugal; qg.u., quadrate; s.ag., surangular;_ s.t., supratemporal ; 
sel., sclerotic plates; stu., stapes; spl., splenial ; sq., squamosal. 
. Top view of same skull. One fifth natural size. Restored. avt., articular ; 
ex.occ., exoccipital ; fr., frontal ; na., nasal; nar., nares ; occ.c., occipital con- 
dyle; pa., parietal; pin., pineal foramen; pinz., premaxilla; prf., prefrontal (2) ; 
ptf., postfrontal ; s.ag., surangular; s.occ., suraoccipital ; s.t., supratemporal ; 
s.t.f., supratemporal fossa ; sq., squamosal. 
Inferior view of skull of Baptanodon discus (No. 603). One fifth natural size. 
Restored. ag., angular; b.oce., basioccipital ; b.s., basisphenoid ; d., dentary ; 
ipt., interpterygoid vacuity ; occ.c., occipital condyle; p/., palatine; prs., pre- 
sphenoid ; pé., pterygoid; spl., splenial; v., vomer. The suture between ag. 
and spl. and cor., is incorrectly placed posteriorly. 
. Side view of skull of Baptanodon discus, Marsh (No. 878). One fifth natural 
size. Seen from right side. 
. Side view of skull of Baptanodon discus, Marsh (No. 603). One fifth natural 
size. Seen from left side. 
. Posterior view of skull of Baptanodon discus (No. 878).  th., thyrohyal. 
. The same, restored. One fifth natural size. ag., angular; art., articular ; 
b.occ., basioccipital ; b.s., basisphenoid ; cor. (?), coranoid ; ex.oce., exoccipital ; 
J.m., foramen magnum ; occ.c., occipital condyle ; op.o., opisthotic ; pa., parietal ; 
pt., pterygoid ; q.j., quadrato-jugal; qu., quadrate; s.ag., surangular ; s.oce., 
supraoccipital ; s.¢., supratemporal ; sta., stapes; s.t,f., supratemporal fossa ; 
sq., squamosal. 
. Anterior view of pectoral girdle of Baptanodon (No. 919). One fifth natural 
size. co., coracoids ; sc., scapule ; ~., surfaces for clayicles. 
. Dorsal view of the same girdle. One fifth natural size. Lettering same as 1. 
. Ventral view of pectoral girdle Baptanodon discus (No. 878). One fifth natural 
size. Restored. cl., clavicle ; 7.cl., interclavicle ; h., humerus. Other letter- 
ing same as figures 1 and 2. 
