968 | General Notes. [Septet 
SomME NEW MAMMALIA OF THE Puerco Formation—-Ata 
cent meeting of the Philadelphia Academy, Professor Cope Stated 
that he had recently received from the Puerco beds of New Mex 
ico remains of a number of individuals of the extinct mami 
he had named Periptychus ditrigonus} Besides jaws and teeth 
with permanent and temporary dentition in good preservation, 
superior molars, exterior to the external tubercles. Conoryetes 
ditrigonus has the molars of both jaws larger than those of the C 
comma, and there is less difference in size between the posterior 
and anterior teeth than in that species. : : 
The following new species accompanied the above : Penpiye 
only, which soon unite. The anterior pair is represented |; 
part of the external one which forms a narrow lobe. The 
larger than in the true molar. 
MIERE. 
groups, its position is not likely to be in any known order of 
Tertiary periods. i ae 
GrotocicaL Notes.—General—The reports of the Brits 
committees of the International Geological Commission s 
geologists are much at variance in their ideas as to the relation, 
1 Proceed. Amer. Philos. Society, 1882, p, 465. 
