1020 General Notes. [ December, 
a small median posterior marginal tubercle, which runs into a 
posterior cingulum, and is wanting from the Z. penetrans. The 
tubercular has the three anterior cusps distinct as in Didymictis 
sp., while the heel is longer than in the known species of that ge- 
nus. Its external border rises into a prominent cusp with trian- 
gular base. The fourth premolar has a small heel on the inner 
posterior side, and an acute anterior basal cusp. The principal 
cusp is robust and the basal portion is widely grooved posterior- 
ly (apex lost). True molars with an external cingulum. Ename 
obsoletely wrinkled. Length of true molar series, .024; of fourth 
premolar, .0075; length of last molar, .oo8; width of heel of 
second true molar, .005; length of crown of do., .007.—E. D. Cope. 
Tue PERMIAN Formation oF New Mexico.—This formation is 
richly fossiliferous in New Mexico, and the vertebrates include 
several of the types already known from Texas and Illinois. 
Such are, among reptiles, the genera Diadectes, Dimetrodon and 
probably Clepsydrops. Of batrachians there are two genera, Z7y- 
ops, and what is probably Zatrachys. Diplodus represents the 
fishes. All the individuals, and hence, probably, the species, are 
of smaller size than those of the Texan Permian, resembling 1: 
this respect those found in Illinois. Two species of batrachians 
of the genera above mentioned, are new, and may be described 
as follows: : 
Eryops reticulatus—The most prominent peculiarity of this 
Species is seen in the neural spines, which are not expanded at 
the summit as in &. megacephalus, but have rather contracted 
apices.. Another character is the sharply reticulate sculpture of 
the maxillary bones. The species is much smaller than the EE. 
.007 ; fi 
__ LZatrachys apicalis—Represented by vertebr and dermal bones. 
-nence is a keel, 
spi 
