xX LIST OF FIGURES IN TEXT. 
PAGE 
Wngualliphalangeslot -enotostegalgigass eee eee ener ek tee Rae 292 
ILS aR ae hyo OF GemoGodys UHRA oocccccbvcoadovvab000c000000e00005005000% 293 
Fore and hind flippers of Colpochelys kempi in the United States National Museum........ 294 
Oblique internal view of left mandible of Thinohyus (B) subequans Cope ..........-..-- 307 
External view of left lower mandible of Thinohyus (B) subequans Cope................ 307 
Superior view of left lower mandible of Thinohyus (B) subeequans Cope.................. 307 
Anterior portions of upper and lower jaws of Thinohyus siouwensis ....... Ee teen as 317 
Internal view of the right mandibular ramus of Baptanodon natans ................--. 327 
Cross-section of posterior end of left mandibular ramus of Baptanodon natans ........... 327 
Cross-section) on scleroticiplatesiotaB. natansin an nae ace eine eee cae 0 O28 
Lateral view of a section of the anterior part of rostrum of Baptanodon natams.......... 329 
Cross-section near middle of snout of Baptanodon natans.... 0.2.0... 00. eee ee ee 329 
Atlas, axis, third and fourth cervical vertebree of Baptanodon natans..............-.-+- 330 
Lateral view of intervertebral disk of Baptanodon natans.........0 20.04.0022 0002 02s 330 
View of the proximal end of humerus of Baptanodon natans........ 0... 2-00.00 0 ee ee 331 
Wi natofeBaptanodoninatanss tas wc iiss e rors sei ses ees er suet ns cere nseaN eee iy ata ere 331 
RadiustotmBaptanodon matansmrcer rae erie are hho aes cir ara in ae Aan sare eee ene 331 
External view of acetabular end of ilium of Baptanodon discus........-....-.0.0-.005. 332 
Atlas, axis, third, fourth, fifth and sixth cervical vertebree of Baptanodon robustus........ 33 
Lateral view. of anterior or median dorsals of Baptanodon robustus ..............02045- 334 
