REP'J'ILIA. 



LITERATURE OF THE SUBJECT. 



1834. Harlan, in Transactions of the American Philosophical Society, v. IV, 

 p. 405, pi. XX, figs. 3-8. Mosasaurus missuriensis. Snout de- 

 scribed. 



1845. Gohlfuss, ill Nova Acta Acad. K. L. C. Nat. Cur., XXI, p. 179, pis. vi, 

 vii, viii, ix. Mosasaurus 7naximiliani described (with malar arch) 

 (possibly remaining part of Harlan's specimen). 



1856. Leidy, in Proceedings of the Academy of Natural Sciences, Philadel- 

 phia, p. 8t^. Ischijrosaurus antiquus described. 

 Leidy, /. sup. c, p. 73 ; six species of reptiles from the Fort Union beds 



of Judith River described. 

 Leidy, I. sup. c, p. 311. Hadrosaurus occidentalis and two tortoises 

 from the same beds described. 



1-8G0. Leidy, Transactions of the American Philosophical Society, p. 145. All 

 the species of the Fort Union epoch redescribed and figured. 



1868. Cope, in Leconte's Notes on the Geology of the Extension of the Union 



Pacific Railroad, Eastern Division, on the Smoky Hill, p. Q)'6. 

 Elasmosnurus platyurus described. 



1869. Co|)e, in Proceedings of the Boston Society of Natural History, p. 250, 



January {separata). The ordcv Pi/tkononiorpha defined; the num- 

 ber of cervical vertebrae, structure of the posterior regions of the 

 cranium, of the lower jaw, scapular arch, and tore-limb first deter- 

 mined ; genus Platecarpus defined. 



Cope, in Proceedings of the American Philosophical Society, June. 

 Articulation of splenial bone in Pythonomorpha described ; genus 

 Polycotylus described. 



(Jope, Transactions of the American Phihisophical Society. Part I of 

 Synopsis of Extinct Batrachia, Reptilia, and Aves of North Amer- 

 ica (to p. 104), issued in August. Elasmosaurus and Polycotylus 

 described and Reptilia of Fort Union epoch determined. 



1870. Cope, in Transactions of the American Philosophical Society, same 



work, part II (to p. 235), issued in April. Order Pythonomorpha 

 further described, its genera further defined, and Liodon jrronger 

 described. 



