152 University of California Publications. [Geology 



Measurements. 



Length of anterior cannon-bone measured on anterior surface 175 mm 



Width of anterior cannon-bone measured at proximal end. ... 56 



Width of anterior cannon-bone measured across distal condyles 61 

 Thickness of anterior cannon-bone measured at middle of 



shaft 22 



Length of posterior cannon-bone measured on anterior surface 180 

 Width of posterior cannon-bone measured at proximal end. ... 49 

 Width of posterior cannon-bone measured across distal con- 

 dyles 56.5 



Thickness of posterior cannon-bone measured at middle of 



shaft 27 



Greatest length of astragalus 62.5 



Width of astragalus across proximal trochlea 37 



Width of astragalus across distal condyles 42 . 5 



Width of navieulo-cuboid 51.5 



Greatest proximo-distal width of naviculo-cuboid at anterior 



border 18 



Length of a phalanx of first row 58.5 



Width of a phalanx of first row at proximal extremity 30.5 



Width of a phalanx of first row at distal extremity 26 



Length of a phalanx of second row 43.5 



Width of a phalanx of second row at proximal extremity 29 



APLOCERUS MONTANUS Ord. 



PI. 20, Figs. 3 and 4. 



Parts of two anterior cannon-bones from the Potter Creek 

 Cave are referred to this species. No. 4312 (PL 20, fig. 3) rep- 

 resents the proximal three-fourths of the right cannon-bone. 

 The specimen shows traces of rodent grawing and is further 

 disfigured by an exostitial growth at the proximal end, on the 

 inner side of the bone. The middle of the shaft is slightly wider 

 than the recent specimen of Aplocerus with which it is com- 

 pared, but otherwise the two correspond closely in structure 

 and dimensions. No. 4382 (PI. 20, fig. 4), the distal half of 

 a left anterior cannon-bone, is slightly larger than the cor- 

 responding element in Aplocerus, but in other respects does 

 not differ from that genus. In the accompanying table, the 

 dimensions of these two specimens and of Aplocerus moutanus 

 are given in parallel columns. 



