Pach)i"hizodus Minimus, a New Species of 

 Fish from the Cretaceous of Kansas. 



KV ALHAN STEWART. 



Contribution from the Paleontoloo-ical Lal)oratorv No. 41 



While collecting with the Kansas University Geological Expe- 

 dition last summer I was fortunate enough to find a specimen of 

 Packyrhizodus from the Butte Creek region in Logan county, 

 Kansas, that is much smaller than any of the species heretofore- 

 described, for which I would propose the name of /'. ininimtts. 



Lower jaw of I', minimus, twice its natural size. 



The specimen consists of the mandibles only, which are charac- 

 terised as follows: The dentaries are slender and slightly incurved 

 at the symphysis where they also seem to be bent slightly down- 

 ward. The symphysis is bifurcated by a deep groove on the 

 external side but internally it is continuous from above downward. 

 On the external side there is a shallow groove just below the alveolar 

 border, which becomes indistinct toward the symphysis. The lower 

 border of the bone is sharp and nearly straight, and the external 

 side is deeply grooved as in P. leptognathits. There are eleven 

 teetli preserved upon one of the rami and room for at least as many 

 more. They are conical, non-striated and directed inward; the 

 last is situated quite a distance from the coronoid angle, below 

 which there is quite a depression. 



{:1T) KAN. UNIV. QUAR., VOL. VIII, NO. 1, JAN. 189'J. SERIES A. 



