OSTEOLOGY OF POLYGLYPHANODON—GILMORE 231 
unable to determine the exact position of the lizard-bearing stratum 
in the Upper Cretaceous section. That it was in the dinosaur-bearing 
part of the section was abundantly indicated by the finding of several 
fragmentary dinosaur specimens both ahove and below the lizard 
layer. The locality is referred to at various places in this paper 
as the “lizard locality.” (Pl. 24.) 
A detailed list of the parts comprising the several specimens is 
here given in order that the reader may have a full knowledge of 
the available materials.’ 
LIST OF AVAILABLE SPECIMENS 
U.S.N.M. No. 15477, type. Nearly complete skull and lower jaws with full 
dentition; axis and 8 articulated cervical vertebrae; 15 dorsal, 2 sacral, 
and 3 caudal vertebrae; complete pelvis; beth femora; right tibia, distal 
end of left tibia; fibula, astragalus, caleaneum; many bones of hind foot 
and tarsus; humerus, lacking distal end; proximal end of ulna; numerous 
bones of fore foot; fifth cervical rib, right side; last thoracie rib of right 
side; many incomplete thoracic ribs. Collected by George B. Pearce, July 
DPE YE 
U.S.N.M. No. 15559: Left maxillary with teeth, articulated parietal and frontal, 
right quadrate, right ramus complete and part of left ramus, both with 
teeth, and skull fragments; 15 presacral vertebrae; right scapula and cora- 
coid, part of left scapula; left clavicle; interclavicle; left humerus and 
distal half of right humerus; both ulnae; both radii; some carpal and 
fore-foot bones; fragmentary portions of pelvis; femur lacking proximal 
end; tibia; numerous pieces of ribs. Collected by George B. Pearce, July 
22, 19387. 
U.S.N.M. No. 15566: Left quadrate with articulated squamosal; articulated 
series of 29 vertebrae (6C, 19D, 2S, 2Ca), greater portion of right scapula 
and coracoid; right clavicle complete and part of left clavicle; interclavicle; 
complete left humerus and fragments of right; both ulnae; radius; 
part of carpus and fore foot; nearly complete left half of pelvis and part 
of right half; both femora; both tibiae; many tarsal and bones of hind 
feet, most of the ribs of left side articulated, a few parts of ribs. Col- 
lected by George B. Pearce, July 22, 1937. 
U.S.N.M. No. 15567:5 presacral vertebrae, incomplete tibia, and many frag- 
mentary bones. Collected by George B. Pearce, July 22, 1937. 
U.S.N.M. No. 15568: Nearly complete disarticulated skull, both rami, good denti- 
tion; axis centrum, 38 cervical vertebrae; 6 dorsal and 22 articulated caudal 
vertebrae; right scapula and coracoid and portions of left scapula; right 
ciavicle ; interclavicle; left humerus; both ulnae; numerous carpal bones; one 
nearly complete articulated fore foot and numerous elements of the other; 
articulated pelvis with both hind limbs and feet complete. Collected by 
George F. Sternberg, July 22, 1937. 
U.S.N.M. No. 15569: Incomplete lower jaws without teeth, tibia, fibula, and a por- 
tion of a foot. Collected by George B. Pearce, July 23, 1937. 
U.S.N.M. No. 15573: Portion of a maxillary with teeth, fragmentary parts of 
both scapulae, parts of both humeri, astragalus, caleaneum, several foot bones, 
and numerous fragments. All parts weathered out. Collected by George F., 
Sternberg, July 22, 1937. 
2 Several additional specimens were collected by the 1940 Smithsonian Paleontological 
Expedition. To date skeletal parts of nearly 50 individuals have been found. 
