658 The American Naturalist. [July, 
are at least 5000 feet thick. The subdivisions of this series are not dis- 
tinctly differentiated. The Dakota horizon has no true representative, 
but the Benton shales and clays with the typical Inoceramus problem- 
aticus and Scaphites occur near Juarez and in El Paso, Texas. The 
chalky beds of the Niobrara sub-epoch are missing, and the whole of 
the Niobrara. Pierre is apparently represented by thinner ferruginous 
clays and impure limestones marked by a commingling of the char- 
acteristic fauna and the Exogyra ponderosa of the Southern States. The 
Eagle Pass beds, correlated by White with the Fox Hill stage grade 
into the Laramie, and the latter into the Eo-Lignitic beds of the South- 
ern States, the whole having a unity of littoral lithological features 
indicating that the Upper Cretaceous and basal Eocene from the 
Dakota to the Claiborne inclusive was a continuous epoch of sedimenta- 
tion, without any serious interruption of continuity until toward its 
close, and deposited at a marine base level now occupied by the eastern 
masses of the Rocky Mountains and eastern Sierra Madre. (Am. 
Journ. Sci., Vol. XLV, 1893.) 
On a new Musteline from the John Day Miocene.—In strik- 
ing contrast to the Tertiary formations of Europe, those of North 
America have yielded but very few mustelines. From the White River 
beds only the problematical genus, Buncelunus Cope, the systematic 
position of which is quite uncertain, has so far been obtained, and the 
John Day beds have hitherto yielded no members of the family. For 
this reason, even scanty fragments are of importance. Among the 
collections of the Princeton expedition of 1889 is a mandibular ramus 
containing only p2 and p3, but displaying the alveoli of the other teeth, 
which was found in the John Day beds at Silver Wells, Oregon. It is 
obvious at the first glance that this jaw cannot be referred to any genus 
of carnivores hitherto known from the John Day, and though the 
absence of the characteristic teeth renders the framing of a generic 
definition very difficult, yet it is possible to so define it as to make 
identifieation of other specimens easy. T, 
Parietis gen. nov., Dental formula Cr Pz Mz- p2 and 3 small very low, 
but relatively thick, massive, obtusely pointed and with a cingulum 
around the entire crown ; enamel coarsely wrinkled. Molar alveoli 
decreasing in size from 1st to 3rd; m3 implanted by a single fang. 
P. princeous sp. nov. Mandible short but thick and; ,heavy, with a larger 
mental foramen beneath p2 and a smaller one beneath p3, P1 very small 
and inserted by one root. Size small. Length of molar-premolar series : 
M.:032. Lengthofpz,:005: Width of p2 003. Length of alveolus of 
