M. 



Length sectorial and two tuberculars 0210 



" " alone 0045 



Width " 0020 



" first tubercular '. 0030 



Length" " 0032 



Depth jaw at do 0060 



This genus differs from Amphicyon in the large development of the 

 internal tubercle of the sectorial and in other points. 



Bodentia. 



Pal^eolagus turgidus, sp. nov. 



The largest species of the genus. Molars with two simple columns, 



the first and fifth grooved on the outer side only, the interior grooves of 



the others weaker. A porous enlargement on the inner inferior part of 



the ramus just behind the symphysis. Diastema obtuse. 



Measurements. 



M. 



Length of molars 016 



' ' three median 010 



Depth ramus at central 011 



Width central tooth 0035 



Length three central molars in a second specimen 0115 



Larger than P. Jiaydenii and still larger than T. agapetilla. 



Pal^eolagus triplex, sp. nov. 

 Size of the last ; first and last molars deeply grooved on both sides as 

 well as all the rest ; first molar with a tri folium -lobate crown. Median 

 three molars with a narrow posterior column as in P. agapetillus. Punc- 

 tate patch on inner face of ramus extensive . 



M. 



Length molar series 016 



" median three molars , 010 



Width of median molar 003 



Depth ramus at " " 011 



This species and the last are rather larger than the prairie marmot 

 ( Cynomys ludovicianus). 



The superior dentition in this genus is I. 2 ; C, ; M. 5. The molars 

 are fissured on the inner side in all the species, and on the outer also in 

 one of them. 



Tricium avunculus. Gen. et sp. nov. 



Char. gen. Inferior molars ? 4, the first composed of three columns, 

 well rooted. Otherwise as in PakBolagus. The larger species referred 

 to this genus may possibly have five inferior molars, a point I cannot 

 now decide. The first molar is more distinctly rooted than in Lepuso and 

 I suspect that the present genus has, like Paloeolagus, not more than five 

 superior molars. 



