A New Labyrinthodont from the Kansas 
Carboniferous. 
BY Se Wy -WILLISDON. 
With Plate XXI. 
The past summer Mr. Herbert Bailey, of the University of Kan- 
sas, discovered, in the vicinity of Louisville in this state, a large 
fossil tooth in most excellent preservation. An examination of the 
tooth proved it to be of such especial interest that I shortly after- 
ward visited the precise locality where it had been found, at the 
crossing of the Vermillion, east of Louisville, in company with Mr. 
Bailey. The geological horizon was determined by the discovery 
of other bone fragments, in situ. It is a dark grey shale. Below 
the bridge at the crossing there is an outcrop of about twenty feet 
of these shales, but no massive limestone layers, so that, without 
further examination, the precise position of the beds can not be 
determined. They are, however, nearly at the upper part of the 
Carboniferous, probably within one hundred feet of the Manhattan 
Limestone. 
The specimen preserved comprises the entire 
crown, measuring thirty-eight millimeters in length 
by fourteen in diameter at the base. The imme- 
diate tip has been partly worn away in life, but 
Was acuminate. It is composed of a dense black- 
ish material, with the exterior smooth, shining 
black. It has about twenty narrow flutings nearly 
straight, running from the base to the tip, separat- 
ing shallow grooves. A transverse section of the 
base shows a narrow pulp-cavity not more than 
Lawn naiedore five millimeters in diameter, which extends in about 
Tooth—natural size. the same proportional width to beyond the middle 
of the tooth, and in all probability to near the apex. The cross- 
section of the tooth throughout is nearly or quite circular. 
A hemisection of the tooth was made near the middle showed 
a structure most remarkably like that of MZastodonsaurus. So nearly 
alike, in fact, that I can discover no difference from the large figure 
(209) KAN. UNIV. QUAR., VOL. VI, NO. 4, OO'., 1897, SERIES A, 
