268 



Platecarpus curtirostris, Cope. Plates XIV, Jig. 2; XV, fig. 3; XVI, figs. 

 5,6; XVII, fig. 2; XVIII, figs. 7, 8; XXI,fig.S; XXXVI, fig. 5; XXXVII, fig. 10; 

 XXXVIII, fig. 1. 



Liodon curtirostris, Cope, Proceedings of the American Philosophical Society, 1871, December.— 

 Lestosaurua curlirostris, Marsh, I. c. 



Niobrara chalk of" the Smoky Hill River, Kansas. 

 aa. Relations of stapedial fit unknown : 

 Platecarpus crassartus, Cope. Plate XXVI, figs. •4-12. 



Liodon crassartus, Cope, Proceedings of the American Philosophical Society, 1871, 1G8, and 

 December 



Niobrara chalk of Eagle Tail, Colorado. 

 Platecarpus simus, Marsh. 



Lcstosaurus simus, Marsh,/, c, 1872, June. 



Niobrara chalk of the Smoky Hill River. 

 Platecarpus latifrons, Marsh. 



Lcslosaarus latifrons, Marsh, I. c, 1872, June. 



Niobrara chalk of the Smoky Hill River, Kansas. 

 Platecarpus gracilis, Marsh. 



Lcstosaurus gracilis, Marsh, I. c, 1IS72, June. 



Niobrara chalk of the Smoky Hill River, Kansas. 

 Platecarpus 1 ? latisplnis, Cope. Plate XXVI, fig. l-G. 



Liodon latispinis, Copo, Proceedings of the American Philosophical Society 1871, p. 109; 

 1871, December. 



PlATECAPPUS ? GLANDIPERUS. Cope. Plate XXVI, figs. 13, 11. 



Liodon ylaudifcrits, Copo, Proceedings of the American Philosophical Society, 1871, December. 



Niobrara beds of the Smoky Hill River, Kansas. 



aoca. Stapedial pit excavated in a plane surface: 



PLATECARPUS MUDGEI, Cope. Plates XVI, fig. 3; XVII, fig. 5; XXVI, fig. 3; 

 XXXVII, fig. 7. 



Liodon mudgei, Cope, Proceedings of Oio American Philosophical Society, 1870, p. 581. — ITolco- 

 dus mudgei, Cope, t. c, 1871, December. — Iihinosaurus mudgei, Marsh, American Journal 

 of Science and Ails. 1872, Jum-. 



Niobrara chalk of the Smoky Hill River. 



