VERTEBRATA FROM THE NEOCOMIAN OF KANSAS.* 



BY F. W. CRAG IN. 



The "Belvidere section,"' "Blue Cut Mound section," and 

 "Blutt* (A-eek section," mentioned below are the geoloijjical 

 sections which the writer published several years ago in the 

 Bulletin of the IVashhitrn College Lahoratori/ of Ndtiivdl 

 Historij (No. 11), and in Vol. YII of the American Geologist 



The first and second are in the southeastern part of Kiowa 

 county, Kansas, the third in the northeastern part of Clark 

 county. 



The shales in which all of the described fossils were found 

 belong clearly to the Fredericksburg division of the Comanche 

 series, as shown by the occurrence in them of Sphenodiscus 

 pedernalis, Roem., Scliloenbachia peruviana,Yon B., Holec- 

 typus plamdns, Eoem., Exogijra texana, Roem., and many 

 other invertebrate fossils of that division. 



That the Fredericksburg division corresponds to a part of 

 the European Neocomian, is clearly shown by its echinoderm 

 fauna, which, barely represented in Kansas, is well developed 

 in Texas. 



Plesiosaurus mudgei, sp. nov. 



Plate I, figs. 1-3 (? and also fig. 4). 



About the size of P. neocomiensis, Campiche, as tested by 

 comparison of the type (Kiowa county) and Clark county 

 dorsal vertebrae with the measurements which Lydekker gives 

 of the casts of dorsal vertebrae of that species presented to 

 the British Museum by M. Campiche, but ditfering from 

 P. neocomiensis in the form of the vertebraj; dorsal vertebn© 

 moderately cupijed, their centra having the three dimensions 

 (length, height, and breadth across ends) nearly equal; con- 

 striction as shown in figs. 2 and 8 of the plate. 



*A private edition of this article, without the plates and with a different pagi- 

 nation, was published May 12th, 1894. The shalo.s herein referred to are tlie Kiowa 

 shales of the later-written articles on geology and invertebrate paleontology of the 

 Comanche series, published herewith. 



