236 



PE0CEEDING3 OF THE NATIONAL MUSEUM 



SPANOXYODON,-5 new genus 



Type. — Spanoxyodon latrunculus, new species. 



Distribution. — Middle Paleocene, Fort Union, Mont. 



Diagnosis. — Symphysis long, subc3^1indrical, with procumbent 

 canine. Pi_2 absent. P3-M2 closely similar to Chriacus but meta- 

 conid of P4 larger and paraconid of Mo more median than in the geno- 

 type and probably other species of Chriacus. 



SPANOXYODON LATRUNCULUS," new species 



Type. — U.S.N.M. no. 9287, left lower jaw with canine alveolus and 

 P3-M2. Collected by Dr. J. W. Gidley. 



Horizon and locality. — Gidley Quarry, Fort Union, Middle Paleo- 

 cene horizon. Crazy Mountain Field, Mont. 



Diagnosis. — ^Sole known species of genus. Measurements of type in 

 millimeters: 



Genus TRICENTES Cope 



TRICENTES LATIDENS " Gidley, new species, ex. ms. 



Type.— U.S. ISi.M. no. 9269, left lower jaw with canine and P2-M3. 

 Collected by Dr. J. W. Gidley. 



Horizon and locality. — Gidley Quarry, Fort Union, Middle Paleo- 

 cene horizon, Crazy Mountain Field, Mont. 



" SiroKoj, few +Af6i, pointed -{-b&ovt, tooth. From the reduced premolars. 



'^ Latrunculus, a sm;Ul bandit. 



" Latus, wide + dens, tooth, in allusion to the wide talonids. Dr. Qidley's notes are sketchy «nd vf«r» 

 clearly only preliminary, but tlicy plainly distinguish the species and apply a name to it. I designal* as 

 type a specimen surely conspecific with that suggested in the notes and much better preserved. It s«ms$ 

 almost certain that this change was intended by Gidley, although not clearly made in his notes. 



