NO. I LOWER EOCENE MAMMALIAN FAUNAS GAZIN 53 



LIMNOCYONIDAE 

 PROLIMNOCYON ELISABETHAE Gazin 



(Plate 6, figure 6) 



New material of Prolimnocyon elisahethae includes a right maxilla 

 (U.S.N.M. No. 22454) with P* and M'' from the Muddy Creek lo- 

 cality 12 miles north of Big Piney, in the La Barge horizon. The 

 teeth are almost identical to those in U.S.N.M. No. 19348 figured 

 in 1952 so that no new information is added. Moreover, Kelley and 

 Wood (1954) have referred to this small though advanced species 

 a right maxilla with P*-M^ from the Lysite horizon in the Wind River 

 Basin. 



No dimensions for the teeth of P. elisahethae were given with the 

 original description. These are included in the table of measurements 

 accompanying the discussion of the following species. 



PROLIMNOCYON, cf. ANTIQUUS Matthew 



(Plate 6, figure 5) 



A pair of lower jaws, U.S.N.M. No. 22452, much more robust 

 and with larger teeth than Prolimnocyon elisahethae were encountered 

 in the New Fork horizon of the Wasatch. Both jaws are preserved 

 from the canine alveolus to about the masseteric fossa. The left 

 ramus included P4-M2, whereas the right ramus has preserved only 

 P2, M2, and the heel of Mi. The length of the tooth row is about 

 the same as in the type of Prolimnocyon antiquus, and like this species, 

 as well as P. elisahethae, has a single alveolus for the root of M3. 

 Unlike P. elisahethae, which has a very slender and shallow jaw, 

 the depth of the New Fork jaws is even greater than in P. antiquus. 

 They are not comparable in this respect, however, to Gray Bull 

 Prolimnocyon rohiistus. The weakness of the parastylid on P4 is 

 also more as in Lost Cabin referred material of P. antiquus than as 

 in P. elisahethae. Mi is more slender than the tooth accompanying 

 the type of P. antiquus. Matthew evidently has this accompanying 

 tooth shown in the position of Mi in the drawing of P. antiquus, but 

 I am convinced that this loose tooth does not represent Prolimnocyon 

 but belongs to Vulpavus. The talonid portion of M2 is also a little 

 more slender than in the preserved portion of this tooth in the type of 

 P. antiquus. 



