1915.] Matthew and Granger, Lower Eocene Wasatch and Wind River Faunas. 67 
P* diameters: (arn ai eke ee ieee ee es re ee 10.4 X 8.9 
M} o . Ravoh Peace ta SPs i) We SOONG N a NER M oa tog eae many 9.09.8 
M2 by aac teen tcte HEUTE NSS RN en GENE NT MSN iT eee ad wens ee Phone SP 4.6xX9.9 
ie % a Daa Mac cee Raheny Nal Cech al A ae Ge waned aed OM cerca we tent Sy 6.0.55 
Jaw; leneth, canine te cConayie 2 oe i ee ae ee 91.5 
‘. - depth peBealy Baers cee ee Ge ieee thee = Ae eae ie eee aes 
i 6 eG yaa Wat Fae OG eae EY te ae Ea et ea th 19.7 
Humerus, lentes oo a agi ahaa eat a eae ren eters eet a 92.5 
ciaimneter Of Promina EN ie Oe ea en ea aes 21.0 
. ciaimeters o1mniddle oF shart ci ia a rn 14.1% 7.38 
iy Wit Gea ee ee Se ae a eee oe leas 25.2 
Ulnia, ere ess eee er ace ee ee gee ae A Rael oe 92.9 
‘< gSiameters-ai mid Sheets cect ee ae ie Wa as ee a eae Br. ENT: 
MMe Toh acter decent 1 Mankingmteninmitaearaebed te taer they neater edi Lisp trerten a a Uitristnay wh er aN gor ga 10.7 
‘length of olecranon from upper border of radial facet................. 24.2 
Rading, tenes ee ee ane OU GMa CO eked MAE re, 68.0 
tc” ” -Ghamneters OF ore ren ea es es eda en Saati 11.0 X 7.8 
- “ ee cs ci ir cd act agen G5 NOME aa ar Reh ete ee OO OC ord 
i SE BT oo es ee ee suber ae 13.0 X 8.6 
Femi, eng ticc ie ck does pabvose coer aa pe ae ng ee sei Aa ee aga 100.9 
(S.  Udiemneter oh dep dhe: Sota wi 0st Siena Oe OMe are et niece 11.8 
‘6. ayeemprmmetna Orr) Oe SYS ge tw os Sere eer gee 26.0 
Astragalus, diameters of body..... Shi ete ee aI sie eee we ee 14.3 xX 10.8 
- ee ERE Me oo, GMO edae Saran Mant RMON ARQ PE RD van sec meine asie a enaue Uae Rouges 
re inmate a en ee RCA ee ts he Se en te 10.4 X 4.5 
e diameters of tibial facet oe asa a Se ee 8 OT 
Calcaneutn, donee) obs, 5 do hcopoutacinatas (ats again ap he in ae Ee 2 hed 
Prolimnocyon gen. nov. 
Generic characters: This genus differs from all previously known Oxyznide in 
retaining a small or vestigial mz. Unlike the Hyzenodonts the second upper molar 
is transverse, the carnassials being m}; m3 are quitesmall. The Oxyznid characters 
are also shown in the thick, heavy jaw with solid symphysis, and in the broad, low 
occiput with wide and rather short basicranial region. 
The genus is represented by at least two species in the Gray Bull horizon 
of the Wasatch, of small size, comparing with Thinocyon of the Bridger. 
The small last molar varies in proportionate size, but in all of them it is 
much smaller than ms, two-rooted, with high protoconid, small paraconid, 
small or no metaconid, and rather long compressed basin heel. A more 
progressive species is found in the Lost Cabin beds. 
Key to Species of Prolimnocyon. 
M,.; = 14-16. Ms small, two-rooted, metaconid usually distinct .:.....4 . P. atavus. 
M,_3 = 21. Ms larger, two-rooted, no metaconid, jaw deep........... P. robustus. 
Miss-se, Lees Fe Tete try ROR e ROMA ae oe ran ak ae OND CORRE ee err pone P. antiquus. 
