532 O. C. Marsh—Notice of New Tertiary Mammals. 
Measurements. 
OR TORN ge oak sg dk bce ok wo Sb ee 450%" 
Transverse diameter at proximal end, -------- 217° 
Antero posterior diameter of head of femur, a Spe 106° 
PUUNRN OTN CUIOOEEN oo es cy chee oan nny abe 98° 
Least transverse diameter of | RS ee ie ee aes” 130 
Least antero-posterior doe age Peas ota, oy eens 55° 
merase Of Crobnlear Sitihtey. 5 5. ee A ee owns 82. 
POOR CLOUN o  ee es oe ves wees 50° 
Transverse diameter of — Srdvle oe 78° 
Least transverse ae r of shaft of humerus, 93° 
Antero-posterior destiater of ulnar condyle of ‘humerus,.-. 70° 
weevOree Cinmeler, 8 see es ws cd ohne Oe 
The known remains of this species indicate an animal ee 
two-thirds the size of Megalonyx Jeffersonii Harlan. The spec 
mens here described are from Pliocene strata, in Central Gali- 
fornia. 
— leptonyx, sp. nov. 
when entire, was about 90™ in se It 
vertical diameter through the basal ini rar 24" wide 
across the articular facets. The specimen was found in the 
Pliocene beds of Idaho, and has been kindly loaned to me for 
examination by my friend, Prof. J. S. Newberry, of Columbia 
College. 
Stylinodon mirus, gen. et sp. nov. 
A new extinct mammal of great interest is represented by 
portions of both jaws with teeth, and a few other remains, 
which were obtained by the writer last autumn in the Eocene 
deposits of Wyoming. These specimens resemble in some 
respects the corresponding parts of the genus Zoxodon Owen, 
from the Quaternary of South America; but may, perhaps 
: have some more affinities with the Edentates. “The low 
