1887] Geology and Faleontology. 469 
Some New Teniodonta of the Puerco.—A right mandi- 
bular ramus from the upper beds of the Puerco formation in 
New Mexico indicates a species of Psittacotherium different 
from the two hitherto known (Hayden’s “ Report U. S. Geol. 
Surv. Terrs.,” Hi Bk. I, p. 196, 1885), and of larger size. 
One cutting anterior tooth (the ag hres external incisor) is 
preserved, and the alveolz of all the molars, with the entire 
second molar free from the jaw. These fragments indicate the 
most robust of all incisor-biters known, and an animal capable 
of doing great execution with the front teeth. The depth of the 
ramus at the symphysis is remarkable, equalling the length of the 
entire molar series p/us half the long diameter of the incisor. 
The long diameter of the incisor equals the space occupied by 
the anterior three molars; in P. mulifragum this oe covers 
but two molars. The enamel of the incisor is smooth; in P. mul- 
tifragum it is grooved. The premolar preserved is ilar to 
that of the P. multifragum in form, but is larger; it consists of 
an external larger and an internal smaller conical cusp an 
single compressed root; the m border of the enamel angu- 
lating upwards on each side. ength of entire me series, 
- .095 ; diameters of incisor,—anteroposterior, .028 ; transverse, 
50; 
transverse, .017; elevation of external cusp, . 
This species may be named EEES ARA odus 
The anterior part of the palate, with tw the characteristic 
teeth of the Pszttacotherium multifragum, pea a hiatus in our 
knowledge of the genus. powerful rodent-like incisor occupies 
the inner edge of the premaxillary bone. It is narrowed and 
produced posteriorly, but the enamel only covers a narrow part 
of each side besides the front, the entire surface being without 
angles. Enamel rugulose and delicately grooved. Posterior to 
this tooth is a diastema about as wide as its crown. This space 
whether truly such is uncertain. Its section is oval, and the 
ong axis is directed obliquely outwards and forwards. Its en- 
amel is delicately rugose and grooved, but a wide open channel 
‘on the anterior half of the external face is the most conspicuous 
peculiarity. The apéx of the crown is lost. No diastema be- 
hind this tooth. The e dimensions of this tooth are about those 
of the external incisor of Psittacotherium muttifragum, and the 
enamel is similarly marked.—£, D. Cope. 
Mr. Hill on the Cretaceous of Texas.—In our February 
number we referred to the reading of a paper by Mr. Robert 
Hill, of the United States Geological Survey, on the Cretaceous 
formations of Texas. In this paper Mr. Hill makes the impor- 
tant announcement of his discovery of a series of beds below the 
