Cope.] 
Measurements of Skull. M. 
Width at malars below orbits.......... doaslnnags Wayhe’s 086 
ne “ azygomata at middle...... We tbe hotline pare lainwie! NOOR 
nt GF onitowlay: Metis bie eidiew abana lal. Wiis ceva O10 
‘ of occipital: comdy legis iiss siniew viv oie sieie'd a soie ara! ORD 
oe at middle of last molars inclusive....,......+ .049 
‘ tf ‘« gecond premolars inclusive.. .030 
( anteroposterior. 6c. s deere »» 023 
Diameters otic bulla 4 transverse .....s ssc ee eee eeee O18 
Uiwestical. abel Wl’ ta io Loe ewes Ole 
{length of timiecantt of, voce O24 
Lwidth at base... ..ieceecees 0125 
Length of dental verter, ii viidilneGv noes e iene duvlene 8002: 
Diameters of nasal bones 
be “ premolar series....:s00s adits Het V NN ONE eteO 
ef ga falc pierce) ty uMeperaste Rr Ameer en at dines ete OBB 
Diameters Pan. ats Aiiteroposterloni i waists bw wens «OO 
(transverse. . RR REL EN Heals OOOO 
Diameters in’ , f anteroposterior. . Tah orev tec Poy wip 2008S 
on tYANBVELEC, 66). 665 Pi bivodlo ate cblebetaredd vee iQ085 
Hidietere wae HNTSLEPORPETION aide iio sy evens? OLEG 
\ transverse (greatest). ..ssesesenees O11 
Depth of mandibular ramus at m, ili.......... ey epetays!| > 1k 
ha “ Sh 8 CED om way Oe Rr 019 
Length of symphysis...... LAA, Hee ee ar ORAS 
Mi £€) ROTO LAT ROLL iis avian odie amitiud) vtaldont vine sa iNORe 
mt MS APUG MOTRIN vei aut ane eae nivale vie vk OBO 
Mi ** of total dental series ..... HP Mel hi ay 06% 
Didineterw Pan, 8 VUTSHOPORMGLTOM Wine’. sislars dea .0085 
CEPA MO MOMS Viti view bite eli vand nae 006 
Hiakerera nies § anteroposterior ...... Capote se oat) .009 
(APOIO VOLMD: is. siditi divlte sis iki UDAWIWiia Galiras 0068 
Dintiovers ta 4G Fanteroposterlor.,..cescceesveviecees O16 
CEBTAVETEG cd Velie etude Gaited ee OUR: 
The second specimen with permanent dentition is of smaller size than 
the type, and the canine teeth are small. It may ei been a female, The 
dental series, including the canine, measures dea 0,59 ; the premolar series, 
0,28 ; the true molars, 0,31. 
The number of specimens of this animal found in the restricted area of 
the Ticholeptus bed of Deep river, Montana, shows the former abundance 
of the species. It was probably gregarious, in the manner of the other 
Oreodontids. We can depict it as seeking the swamps of the shore for its 
vegetable food, and svending much of its time in the water when not feed- 
ing. It was doubtless a good swimmer, and the characters of its feet will 
be sought for with interest for light on this point. The use of the huge 
superior nasal vacuity of the skull of this genus and Leptauchenia can 
