VoL - 5 1 Merriam. — John Day Carnivora. 51 



Astragalus, greatest antero-posterior diameter 36 



Astragalus, antero-posterior diameter through trochlear region 28.3 



Astragalus, greatest width of trochlear surface 20 



Cuboid, greatest antero-posterior diameter on superior surface 17 



Combined antero-posterior diameter of calcaneum and cuboid in po- 

 sition 82 



Width of tarsus, cuboid, and navicular 35 



Metatarsal III, greatest length from distal end to ectocuneiform artic- 

 ulation measured on superior surface 85.7 



Metatarsal III, transverse diameter at narrowest portion of the shaft.... 13.8 

 Metatarsal IV, greatest length from distal end to cuboid ariculation 



measured on superior surface 82 



Metatarsal IV, transverse diameter at narrowest portion of shaft 10.5 



Metatarsal V, greatest length from distal end to cuboid articulation 



measured on superior surface 65 



Metatarsal V, transverse diameter at narrowest portion of the shaft 8 



In another specimen, A. debiiis major (No. 110) showing the 

 same characters as those found in that described above, the per- 

 fect tibia and calcaneum have the following dimensions : — 



mm. 



Tibia, greatest length 256 



Tibia, transverse diameter at proximal end 53 



Tibia, antero-posterior diameter at proximal end 55.5 



Tibia, transverse diameter at distal end 37 



Calcaneum, greatest antero-posterior diameter 70 



Vertebrae. — With the Archaclurus skull No. 1681 there are 

 preserved the axis and the third cervical. Both are much like the 

 corresponding elements described by Cope for Nimravus gom- 

 plioclns, and no characters are noted which would serve to dis- 

 tinguish them. 



Associated with the lower jaw No. 1680, referred to A. debiiis 

 major, there is in the collections from the Middle John Day a se- 

 ries of four posterior lumbar vertebrae in articulation. The ante- 

 rior member of the series supports a very sharp, thin, inferior 

 keel, and the metapophyses are narrow. There is a rudimentary 

 anapophysis on this vertebra and the succeeding one. The spine 

 and transverse process are broken away. On the third member 

 of the series (text-figure 17) the inferior keel is strong, but not 



