178 KANSAS UNIVERSITY QUARTERLY. 
terms until 1875, when Prof. Cope* added the allied genus Dapéinus 
from the cretaceous of Kansas, but which he later recognized as a 
synonym of Saurodon Hays. 
The exact date of Prof. Cope’s retraction I have been unable to 
exactly determine, but it was probably’not until after 1878, as at 
this time Mr. E. T. Newtont described a fish from the lower chalk 
of Dover and provisionally placed it in Daftinus. A little later, in 
the same year, Mr. Newton published a paper entitled} ‘‘Remarks 
on Saurocephalus, and on the Species which have been referred to 
that Genus.” In this paper Mr. Newton carefully goes over the 
ground and finally coucludes, as Dr. Leidy had already done, that 
the name Saurodon should be no longer used. 
After carefully examining the material at my command I am led 
to the conclusion that there are two distinct genera, which should 
be known as Saurocephalus and Saurodon; the evidence for which 
the following descriptions, I think will make apparent. 
During the past summer the museum was presented with a fine 
specimen of Sauwrodon by Mr. H. M. McDowell of this place, and 
was also loaned another specimen of this genus by Mr. W. O. 
Bourne of Scott City. The second specimen is not so complete as 
the first yet it shows many points of interest that are not visible in 
the first specimen mentioned. The two forms are new to science 
and will be called Sawrodon xiphirostris and Saurodon ferox respec- 
tively. 
Saurodon xiphirostris sp. nov. 
This specimen consists of a skull crushed obliquely, the centra 
of several vertebrae, and also a portion of a shouldc1 girdle in a very 
bad state of preservation. The specimen is of nearly the same 
size as that of the type of Saurodon (Daptinus) broadheadii\| de- 
scribed by myself. 
The maxilla is short and deep, the, depth not being as great 
as in S. droadheadit. The alveolar border is nearly straight and 
has alveoli for about thirty-one teeth, which are about the size 
of those described in the above species. The posterior extremity 
can not be examined as there is a suborbital bone covering this 
portion on each side of the skull, but it is probably very similar to 
that of the figures of Saurodon ferox described below. The supe- 
rior border is sharp, and gives attachment to some bone, probably 
a sub-orbitai or jugal. The palatine condyle seems to be very 
*Cret. Vert. West., p. 213. 
*Quart. Jour. Geol. Soc., 1878, No.. 135, p. 439. 
¢Quart. Jour. Geol. Soc., 1878, No. 136, p. 786. 
|Kans, Uniy. Quart. vol. vii, p. 21-29. 
