0. C. Marsh—New Tertiary Mammals. 215 
Measurements, 
Antero-posterior diameter of last lower IAL, occa 8 ek ie 72 pe 
Mane ree dinvicter. .... <i. 45.4 os 1 
MM Oe daw... 36s; Ak ee 9° 
Depth of jaw below last lowér niolat os... 5.5 1c odes es 2°5 
The specimens now representing this species were found, last 
autumn, near Henry’s Fork, by Mr. O. Harger. 
Centracodon delicatus, gen. et sp. nov. 
Sout as large as a mole, and apparently amarsupial, ‘The jaw 
1s slender, and its lower border regularly curved longitudinally. 
last molar has a low, sharp, posterior tubercle, and in front a 
high pointed external cusp, with two small inner tubercles. 
Measurements. 
Longitudinal extent of seven posterior lower teeth,......12°8 ™™* 
Extent of last thiee MOlara 545 6s aa ei ne oe es 6° 
Antero-posterior diameter of last lower molar,.......... = 
Transverse Giniieter, 2 eas Hees Lous aoe Ciicie 12 
Depth of jaw below last lower molar,............+.. coe 
The above specimen was discovered, in September of last 
year, near Henry's Fork, by Mr. F. Mead, Jr. 
Nyetilestes serotinus, gen. et sp. Nov. 
An interesting genus of very small bats is indicated by part 
of a lower jaw with the last three molars perfect. On the outer 
Side, these molars resemble those of Nyctitherium, but differ es- 
o 
Slender, and proportionally less d than in Nyetitheriwm. 
) y iess aeep 
The present spear vee somewhat smaller than N. velow. 
