116 

 Measurements from the lower jaw of Patriofelis uUa are as follows : 



Inches. Lines. 



Estimatetl length of jaw 6 



Distance from back of condyle to canine alveolus 5 4 



Distance from back of condyle to back of last molar 2 3 



Space occupied by the molar series .3 



Breadth of coronoid at base 1 7 



Depth of jaw below penultimate molar -. 1 -i 



Depth of jaw below back of last molar 1 6 



Measurements of the molar teeth, estimated from their fangs and alveoli, 

 are as follows : 



Lines. 



Breadth of first molar tooth 5 



Breadth of second molar tooth , 7 



Breadth of third molar tooth 8J 



Breadth of fourth molar tooth 7 



Breadtli of tifth molar tooth 8 



Fig. 20, Plate VII, represents a tooth discovered by Dr. Carter near Fort 

 Bridger. It appears not to belong to the lower jaw of Patriofelis, but pci'- 

 haps belongs to the upi)er jaw. The crown is composed of a large conical 

 lobe with a broad heel, the sides of" which slope from a median ridge. The 

 breadth of the crown is 8^ lines ; its thickness 5 lines. 



SINOPA. 



SiNOPA EAPAX. 



A lower-jaw fragment, containing two teeth and portions of two others, 

 represented in Fig. 44, Plate VI, appears to indicate an extinct genus related 

 to the canine family. The specimen was discovered by Dr. Carter in the 

 vicinity of Fort Bridger, and was by him presented to the writer. It belonged 

 to an animal about the size of the gray fox. 



The specimen is insufficient to ascertain with any certainty the exact rela- 

 tionship of the animal to which it belonged, but the character of the teeth 

 leads me to view it as having held an intermediate position to the existing 

 genus Canis and the extinct one Hysenodon. 



Tlie teeth preserved entire in the specimen appear to correspond with the 

 last premolar and the first or sectorial molar of the fox, and the remains of 

 two teeth behind would be of the second and third molars. The last pre- 

 molar is larger than the molars. Its crown is as wide, but is longer than that 

 of the tooth retained behind it. The form of the crown is more like that in 



