Marsh Collection, Peabody Museum. 



447 



The astragalus, figure 95, has a rather obliquely placed, verti- 

 cally flattened, rounded head, a slightly grooved trochlea, and 

 a vertical fibular facet. The astragalar foramen is distinct^ and 



92 



ml 



Figures 92, 93. — Left tibia of Sinopa agilis Marsh ; front and end views; 

 three-fourths natural size. (Cotype.) 



Figure 94. — Left calcaneum of Sinopa agilis Marsh ; dorsal view ; one and 

 one-eighth natural size. (Type.) 



Figure 95. — Left astragalus of Sinopa agilis Marsh ; dorsal view ; one and 

 one-eighth natural size. (Type.) 



occupies its usual position. The remainder of the pes is 

 unknown. 



The principal measurements are given herewith : 



Measurements of the Type. 



Length of superior molar and premolar series, including 



canine-.. ._. ._ 68- mm 



Length of superior molar and fourth premolar 29* 



Antero-posterior diameter of fourth superior premolar 9* 



Antero-posterior diameter of first molar 9 • 



Antero-posterior diameter of second molar 8 # 



