NEW PERMIAN VERTEBRATES 637 
a score or more of years, should have escaped the observation of 
previous collectors in this much searched-over region is remarkable, 
and only goes to show that these, like most other fossiliferous beds 
in the West, will never be exhausted. It gives me pleasure to name 
the species in honor of Mr. Paul Miller, whose keen eyesight and 
patient labor have brought not only this specimen to light but also 
many others in the University of Chicago Museum and the American 
Museum of New York City. 
Trematops milleri, Genus and Species New 
Skull (Figs. 1, 2, 3)—The skull of Trematops is remarkable, not 
only among amphibians, but also among Permian vertebrates, for the 
association of certain peculiar characters widely distinguishing the 
genus from any other now known. The chief of these characters 
are: the possession of a median unpaired rostral opening leading into 
a palatine vacuity; greatly enlarged antorbital vacuities; a temporal 
fenestra; and the apparent absence of the parasphenoid bone of the 
palate. In the skeletal characters, aside from those of the skull, 
the genus does not differ much from Evyops, so far as known, and 
doubtless the skeletons of each, when fully known, will show a like 
agreement throughout. 
In shape the skull is subtriangular, its width posteriorly being but 
slightly less than the length from premaxillae to occipital condyles. 
Its surface is coarsely and rather deeply pitted, but presents no traces 
of mucous canals that I can distinguish. The face is markedly con- 
stricted just in front of the orbits, the facial region showing a slight 
lateral convexity, on the outer sides of the large antorbital vacuities. 
Back of the orbits the “table” of the skull is broad and nearly flat, 
perforated by the rather small parietal foramen near its middle. The 
orbits are oval, their greater diameter oblique to the longitudinal 
axis of the skull, their borders thickened in front and behind, but 
thinner above and below, with the plane of their margin looking 
obliquely forward, upward, and outward. -Immediately back of the 
orbit at its outer part, the table turns downward, forming the anterior 
bar of the temporal vacuity. The upper margin of this vacuity is 
periectly preserved on the left side, but the fragments forming it were 
not recovered for the right side of the skull. It is thinned, in outline 
