Xil 
PLATE. 
OO: 
XXXL. 
XXXL. 
XXXL. 
XXIV. 
XXXYV. 
XXXV I. 
XXXVI. 
XXX VII. 
A. 
B. 
XXXIX. 
XI. 
XUI. 
XLII. 
XLII. 
LIST OF PLATES. 
Restoration of the Skeleton of Diplodocus carnegiei Hatcher. 
Protostega gigas Cope. Shoulder Girdles, Pelvic Girdle, Hyoids. 
Protostega gigas Cope. Forearm, Hand, and Foot. 
Dermochelys coriacea. 
Thinohyus siouxensis Peterson. Right side of Skull and Lower Jaws and Superior 
View of Mandible. 
Superior and Palate Views of skull of Thinohyus siouxensis Peterson. 
Side View of Skull of Baptanodon discus Marsh. 
Superior and Inferior Views of Baptanodon discus. 
Pectoral Girdle of Baptanodon robustus. 
Cambarus obscurus, C. diogenes, and C. carolinus reproduced by the three-color 
process. 
Cambarus bartoni, C. bartoni robustus, C. limosus, and C. monongalensis, reproduced 
by the three-color process. 
Anatomical details of structure of Pennsylvanian Cambari. 
Chel of Pennsylvanian Cambari and burrows of D. bartoni and C. carolinus. 
Burrows of Pennsylvanian Cambari. . 
Preglacial Monongahela River, and present range and distribution of species. 
Map of Pennsylvania showing distributional areas of crawfishes. 
