230 VERTEBRATE REMAINS, PORT KENNEDY BONE DEPOSIT. 



is possible that they do not represent more than two individuals. The two other 

 specimens are from different parts of the excavation, so that at least four individuals 

 are represented. The fragments are in good preservation, and they are undistin- 

 guishable from corresponding parts of the wolverine. I give measurements of the 

 most complete ramus, with those of the teeth of another fragment. 



Measurements. 



mm. 



Length from pm-g to condyle, inclusive ; no. 1 ; 76 



Length of pm T ; 11 



Elevation of pm T ; 5.5 



Length of sectorial ; 19 



Elevation of " 8 



Depth of ramus at pm^; 18 



at m 7 , 21 



Width of base of coronoid ; 24 



Length of molar series less m-^ ; no. 2 ; 42 



pm T ; 10 



Elevation, pm T ; 6 



Length, sectorial ; 20 



Elevation, protoconid sectorial; 10 



Length, heel of sectorial ; 4 



This is one of the few species of the Megalonyx fauna that has survived to the 

 present period. Its occurrence so far south as Pennsylvania has not been recorded, 

 and Coues 1 states that its extreme southern distribution in N. America is between 

 latitude 42° and 43°, that is in northern Massachusetts and New York. Its 

 presence in the Port Kennedy fauna indicates a cool if not a cold climate. 



OSMOTHERIUM Cope. 

 Proc. Acad. Nat. Sci. Phil., 1896, p. 385. 



Inferior dentition as in Mephitis, but the dental formula pm. 4, m. 2. Meta- 

 conid well developed ; heel of sectorial large, cupped. 



The inferior dental formula of this genus is that of the extinct form Potamo- 

 therium, which intervenes between MepJiitis and Lutra. The typical species of 

 Osmotherium, however, resembles MepJiitis so greatly in its inferior dentition that 

 I suspect that the superior molar formula will be found to be pm. 3, m. 2, as in 

 Mephitis, instead of pm. 4, m. 2, as in Potamotheriuni. The latter genus is of Miocene 

 age in Europe and North America, the genus Brachypsalis Cope, from the Loup 

 Fork formation of Nebraska being probably founded on a species of Potamotherium. 

 The presence of an additional premolar is important in the Mustelida?, but might in 

 some case prove to be a mere individual variation. In the present instance this is 

 clearly not the case, as it is accompanied in one species by the additional character 

 of the mutual overlapping of the pms. 3 and 4, as in species of Lutra, a relation 

 which does not exist in Mephitis. I do not, however, regard this as a generic 



1 Fur-bearing Animals of North America. 



