0. C. Marsh—Jurassic Mammals. 215 
Art. XXXIV.—Additional Remains of Jurassic Mammals; 
by O. C. Marsa, 
This specimen differs from the jaws of Dryolestes priscus, in 
being more slender, less curved, and less compressed. 
symphysial surface is long, and only moderately roughened. 
The fourth lower premolar is in perfect preservation. It bas 
two fangs, and the crown is very sharp, and much compressed. 
There is a slight tubercle on the front margin, and a low 
distinct heel on the posterior border. 
he following measurements are from this specimen: 
of jaw below first premolar, -...-.------- 2°5 
Depth of jaw below fourth premolar, ---.------- r 
Width of jaw below fourth premolar, ..-.-.--.-- 2° 
Height of crown of fourth lower premolar,.... -- 2 
The species represented by this specimen may be called 
Dryolestes vorax. The animal appears to have been rather 
Smaller than D. priscus. The only known remains are in the 
Yale Museum. 
Yale College, New Haven, August 8, 1879. 
* This Journal, vol. 459, 1878, and vol. xviii, p. 60, 1879. 
+ From Phascolothertasa. with which it agrees more closely, the present genus 
may be distinguished by the greater number of teeth. 
