566 ~ General Notes. "> piang 
DERE of articular face of cervical eis ROS En a PA 
SEEN series 046 
para of parapophysial fossa of ee 018 
Ssverse 024 
New Mex 
In addition to these species, I have vertebre of three other 
species of Plesiosauride from the Fox Hills bed of New Mexico, 
which are not sufficiently well preserved for description. One 
of these is nearly allied to the Uronautes cetiformis Cope, but is 
t 
antigua Leidy, Enchodus, sp., Galeocerdo pristodontus Ag., Ot- 
us, sp., and other characteristic forms. The characters observed 
in the cervical vertebræ of the six species of Sauropterygia of 
the Fox Hills formation, confirm a hypothesis proposed by the 
writer in 1879." This is that the necks of the species grew Aari 
with lapse of geological time, and as the sea shallowed. The 
long-necked forms are in America confined to older horizons of 
e cretaceous.—Z£. D. Cope. 
The Marsupial Genus Chirox.—This genus was described 
by the writer in 1883,’ from a few teeth of the upper jaw ‘pond 
Chirox plicatus Cope, palate with dentition, viewed from below; 4 natural size. 
in the Puerco formation of New Mexico. Since then a palate 
-= with the entire molar series of one side and nearly all that of 
merican Nataralist, 1879, p- 
2 See ae ngs Am er. Philos. ibs cok 321. 
