Cope. ] 310 [Jan. 19, 
Sauroptergia and Pythonomorpha, and during the expedition just men- 
tioned, obtained portions of pterodactyles and of a crocodilian of the genus 
Hyposaurus. The latter order has not been previously known from that 
region, and their remains are not common. Prof. Marsh’s exploration in 
the Cretaceous of Kansas added Pterosauria, but he has not reported any 
Crocodilia, as I once thought, and incorrectly stated. (Proc. Am. Phil. 
Soc. 1871, p. 174.) The crocodile may be called Hyposaurus vebbianus in 
recollection of Dr. Wm. E. Webb, of Topeka ; it is similar in size to the 
H, rogersii of New Jersey. 
An anterior cervical vertebra presents the following characteristics : It 
is that one in which the parapophysis occupies a position opposite the 
lower third of the vertical diameter. In it the centrum is stout in form, 
the articular faces but little concave, the posterior a little more so than 
the anterior, The anterior is almost regularly hexagonal, the posterior 
sub-round, a little deeper than wide. The inferior surface possesses a 
strong obtuse median carina, which disappears in front of the posterior 
margin. Anteriorly it terminates in a short obtuse hypapophysis. The 
suture of the neural arch is very coarse. Surface of the bone smooth. 
M. 
Suen th: of; Combs vo) 5 ops wees le agai nn alvenjaoietia Hepes is ies 037 
Diameter, oh anteriorly, vertical....... MUN ois sa 03 
es ON be MOMIZOMGA itive s/s. cevews 031 
a: Uh postentorlyyavertiodlyers « cininaie te iain 032 
es s i horizontally). aster 031 
Length: of:surface of parapophysisi.....c6c.s.ce cece sven OLD 
As compared with the H. rogersti of the New Jersey Cretaceous, this 
vertebra is shorter and stouter, and the extremities less concave; the 
suture for the neural spine is much coarser. 
This crocodile was discovered in a bluish stratum, belonging to the 
Benton group, or No. 20 of Meek and Hayden, encountered in digging a 
well in Brookville, Kansas,* This point is considerably east of the ex- 
posure of cretaceous rocks seen near forts Hayes and Wallace. It is 
interesting as the first of the Crocodilia found between the Tertiaries of 
the Rocky Mountains and the Cretaceous of New Jersey. 
It was given me by my friend Dr. Wm. E. B. Webb, of Topeka, to 
whom science is also indebted for the polycotylus latipinnis, I have 
dedicated the species to him. 
Dr. Henry Hartshorne read the following paper on Or- 
ganic Physics. 
* This stratum is similar to thatin which Dr, Hayden found the fish Apsopeliv sauriformis, 
at Bunker Hill, 
