“hh > j ¥ : i : 
a Dr. J. Wyman on Fossil Bones from Memphis, Tenn. 63 
ties, but for the fact of its being the most gigantic member of the 
_-order of Rodents hitherto discovered, whether recent or fossil.* 
_; ‘The present fragment is 7-3 inches in length, though the con- 
dyle, coronoid process, “angle” and the whole of the under por- 
tion of the jaw have been broken off—a portion of the notch (sig- 
moid ) between the condyle and coronoid process remains. The 
four molar teeth with their alveolar dependencies are entire, and a 
large fragment of an incisor tooth is still preserved lodged in its 
_ partly destroyed alveolus. The jaw is larger and somewhat more 
massive that the one described by Mr. Foster, but in other re- 
spects does not appear to differ materially from it. An approxima- 
tion to the proportional dimensions of the three jaws which have 
been noticed may be deduced from the following measurements. 
Length of the grinding surface of the molars in 
ae ern lg 
| The specimen from New York, 2:74 inches. 
| 66 pepe ‘“c Ohio, 2:8 “c 
| ease Rhy «© Memphis, 3-1 %, 
In some other measurements the Memphis specimen ‘Be 
largest, has four lamine, the first quite small and 
the third the longest and the most oblique. On 
a 
