NO. 8 MAMMALIAN FAUNA, BADWATER AREA GAZIN 



RODENTIA 



Description of the known Roclentia in the Badwater fauna has been 

 covered by A. E. Wood (1949). The collection described by him is 

 at Amherst College. 



CARNIVORA 



LIMNOCYONIDAE 



LIMNOCYON?, sp. 



A maxillary fragment (U.S.N.M. No. 21088) with only P* may 

 represent Limnocyon, but this is not certain. The specimen shows 

 the infraorbital foramen immediately above and anterointernal to the 

 anteroexternal root of P*, much as observed in Limnocyon. The tooth 

 would appear to be a trifle smaller than in Limnocyon douglassi to 

 judge by Peterson's (1919) illustration of this form. The Badwater 

 tooth measures 9.6 mm. long by 9.4 transversely to base of enamel 

 on the deuterocone. 



MIACIDAE 



MIACIS, cf. ROBUSTUS (Peterson), 1919 



Plate I, figure 2 



A comparatively large miacid is represented by a lower jaw exhibit- 

 ing the teeth P4 to Mg inclusive. Miacis would appear to be indicated 

 by the distinctly basined form of the relatively small talonid of Mo. 

 The talonid of Mi may likewise have been basined, although most 

 of the superior surface of this portion of the carnasial is damaged 

 so that its precise form is uncertain. It is, nevertheless, as in M2, 

 short and decidedly narrower than the trigonid. Mg is missing, repre- 

 sented by a single alveolus. 



From measurements given by Peterson (1919), the type of Miacis 

 robustus from the Uinta at Myton pocket is a little larger than the 

 Badwater specimen. Peterson regarded P4 and Mi as subequal in size 

 so that P4 is evidently both relatively and actually larger in the type. 

 This tooth, however, in U.S.N.M. No. 21087 closely resembles that of 

 the type in the presence of a prominent anterior cusp and a strong 

 talonid cusp, followed posteriorly by a well-developed cingulum. The 

 abbreviation of the talonid in both Mi and Mo likewise suggests M. 

 robustus. 



The type of Miacis iiintensis Osborn (1895) fro"i Uinta B would 

 appear from the scale of Osborn's illustration to be a little shorter 



