48 



Discovered by Prof. B. F. Mudge, near Stockton, Kansas, in a bed 

 containing many teetli of OxyrJiina, Lamna, &c., of small size. Dedi- 

 cated to Dr. John H. Janeway, post-surgeon at Fort Hays, Kansas, 

 who has rendered much important aid to palaeontology and zoology in 

 Kansas. 



PTYCHODUS, Agass. 



Pttchodus polygyrus, Agass., Poiss. Foss. 



l^iobrara epoch, Ellis County, Kansas ; Professor Mudge and Pro- 

 fessor Merrill. 



Ptychodus occidentalis. Leidy, Proceed. Academy Philadelphia, 

 1868, 207 ; Eeport Geolog. Surv. Terrs., 1873, 398 ; tab. xvii, 7-8, 

 xviii, 15-18. 



Kiobrara epoch of the Smoky Hill. 



Ptychodus moetonii, Agass. Poiss. Foss. 

 Niobrara Cretaceous of the Smoky Hill Kiver ; Prof. Mudge. 



Ptychodus whippleyi, Marcou, Geol. North America, 1858, 33; 

 Leidy, Eeport, etc , 1873, 300, tab. xviii, 19-20. 



Niobrara epoch of the Arkansas Eiver, Kansas, and Galisteo, Nevr 

 Mexico; Professor Merrill. 



GALEOCERDO, M. H. 



Galeocerdo ceassidens. Cope, Proceed. Amer. Pliilos. Soc, 1872, 

 355. . 

 Niobrara epoch of the Smoky Hill. 



Galeocerdo hartvellii, Cope, loe. clt, 1872, 356. 

 Niobrara Epoch of the Smoky Hill. 



Galeocerdo falcatus, Agass., Leidy, Report U.S. Geol. Survey Terrs., 

 I, 301 ; tab. xviii, 29-43. 



Niobrara epoch of the Smoky Hill. 



OTODUS, Agass. 



Otodus divaricatus, Leidy, Eeport, I, 305; tab. xviii, f. 26-28. 



Represented by several teeth, of which I select the largest and most 

 perfect as type. The lateral denticles are well developed, though not 

 large. The median cusp is rather narrow and moderately curved ante- 

 ro-posteriorly. The posterior surface is smooth, the anterior coarsely 

 striate at the base. The fangs of the root diverge strongly, but, what 

 constitutes a peculiarity of the species, project far forward and outward 

 at their point of junction below the crown, reminding one of the out- 

 line of the Hottentot Venns. 



Jewell County, Kansas ; Professor Mudge. 



OXYEHINA, Agass. 



Oxyrhina extenta, Leidy, loc. clt. 302 ; tab. xviii, 23-25. 

 Niobrara Epoch of the Smoky Hill. 



LAMNA, Cuv. 

 Lamin^a, two sp., Leidy, loc. cit., p. 304. 



