348 The American Geologist. December, iwy 
represented by figures 21-34 of Dr. Leidy's plate IX seem to be- 
long. They may be called Dryptosanrus kenabekides.* 
From the time of Leidy's first description there have been 
some reasons for suspecting that all the teeth described by him 
belonged to the same genus, indeed to the same animal. iVll 
those teeth were found "in one place and possessed the same 
structural differences." Again, Prof. Cope in describing his 
Laslaps incrassatusf states that he found that the anterior den- 
ticulated carina of some of the anterior teeth was moved 
around the crown so that it was no longer opposite the hinder 
carina; and he says that a further transferrence would produce 
a tooth like those of Leidy's figures 35-45, those with the U- 
shaped section. Furthermore, Cope says that he found a large 
tooth in immediate association with the jaw of his L. incrassa- 
tus, but separated from it, which had the posteriorly truncated 
section described by Leidy as typical; and Cope believed that 
this tooth belonged to the maxillary bone, near the position of 
the superior canine of a mammal. 
Nevertheless, in 1892 Prof. Cope;]; had the opportunity to 
study remains of L. incrassatus which furnished him nearly all 
parts of the skull ; and he did not find, either in the maxilla or 
in the dentary, teeth of the kind represented in Leidy's figures. 
35-45. The teeth of the premaxilla were missing in his speci- 
men and there remains the possibility that they are the ones 
which possess the U-shaped section. Meantime, it seems wiser 
to retain the genera as distinct, awaiting further discoveries. 
The name Axestus was proposed in 1872 by Prof. Cope for 
a genus of trionychid tortoises, found in the Eocene deposits of 
Wyoming. The species A. byssinus was further described and 
figured by Prof. Cope in 1884. § The name is however preoc- 
cupied. It may be modified into Axestemys. Axetus was em- 
ployed in 1834 by Dejean for a genus of beetles. 
Mr. J. Z. Gilbert || has described the skull of a species of 
*The Kenabeek, the greait serpents, 
Lying huge upon the water, 
Sparkling, rippling on the water, 
Lying coiled across the passage, 
With their blazing crests uplifted. — Longfelloiu s Hiaicatha. 
tProc. Acad. Nat. Sci. Phila., 1876, p. 341. 
JProc. Amer. Phiios. Soc, vol. XXX, p. 240. 
gTertiary Vertebrates, p. 116, pi. XV, figs. 1-12. 
IIKansas Univ. Quart., vol. VII, p. 143, with 4 text-figures. 
