Marsh Collection, Peabody Museum. 



205 



the first superior molar are well separated, whereas in the 

 present species these cusps are much closer together. In L. 

 velox, again, the last superior molar has two external cusps, and 

 in L. medius and L. verus there is only one. The last two 



81 



Figure 81. — Lower jaw of Limnocyon medius Wortman 

 halves natural size. (Type.) 



side view ; three 



82 



species differ in the last molar, in that there is a very distinct 

 internal cingulum in the latter, which is absent in the former. 

 Various parts of the skeleton are represented in the speci- 

 mens, and, these apparently agree very closely with those of L. 

 velox. Some parts of lumbar 

 vertebrae are preserved in one 

 specimen, and these show that 

 the double tongue and groove 

 articulations were present, as in 

 Patriofelis. The deltoid crest 

 of the humerus is reduced, the 

 distal end is broad, and there is 

 an entepicondylar foramen. The 



trochlear Surface of the astrag- FlGURE 82.— Fourth premolar and 

 alus is little grooved, and there first and second superior molars of 

 is a considerable Contact between Limnocyon medius Wortman ; crown 

 +k~ -G"k„i~ ^ a ~i t\\ view; two and one-fourth times 



the fibula and calcaneum The natn ; al size (Type) 

 remains indicate an animal some- 

 what smaller than a Grey Fox. The measurements are as 

 follows : 



Length of fourth premolar and two superior molars 17 



Length of superior molars 10 



Width of first molar (in front) 6 



Width of last molar 8 



Length of lower molar and premolar series _ „ 35 



Length of lower molars . .. 13 



Depth of jaw at last molar 10 



Full length of jaw _ _ _ _ . 80 



Length of humerus 65 



Antero-posterior diameter of head of humerus 13 -5 



Transverse diameter of distal end of humerus 13*5 



