1 88 Bulletin American AI iiseum of Natural Histoiy. [Vol. X, 



These proportions show that the evolution of the carpus in the 

 Amblypoda marks an enlargement of the magnum and trapezium 

 and absorption or coalescence of the cent/ale. 



Hind foot. — The very large pes, 

 probably belonging to P. cavirictus 

 (No. 3963), and small pes of P. 

 '■/■ bathmodun (No. 2550) agree in the 



many primitive characters enumer- 

 ated in the Table, p. 178. Analo- 

 gous to the manus we find a curved 

 first metapodial (Mts. I). As in 

 (t J A il^\\\ Periptychus and in Ursus the fifth 



\ r\ metapodial bears a prominent pro- 



'<?.:->' / ""^ ('__ \ \ ^J ^^^li cess for the peroneus Irrcvis abduc- 

 tors. As in most Creodonts the 

 ^^&^\ cuboid is wedge-shaped proximally 



5 Ts] X^ for the calcaneum and astragalus, 



i|/ "" and the astragalo-tibial facet faces 



obliquely inwards (instead of ui)- 



Fig. 13. Fantolaiiihda caTir/ctiix. ^ ^ _ 



Right pes, directly frnm above. No. wards aS in Corxhtiodou) ; this faCCt 

 3963, Am. Mus. Coll. . .11 



is very narrow, bounded by the 



astragalar foramen posteriorly and 



a deep pit anteriorly. A very important feature in this species is 



the thinning out of the inner side of the navicular, bringing the 



ectocuneiform almost into contact with the astragalus. 



Comparative Measurements. 



p. batk)>ipdoii. P. cainricius. 



MM. MM. 



Astragalus, greatest diameter 20 4^ 



Tarsals, transverse measurement 33 68 



Metatarsal 1 23 35 



II 34 Est. 60 



" III 40 61 



IV 36 60 



" V 28 50 



Suborder PANTODONTA Cope. 



The Pantodonta or Coryphodontia are distinguished by a very 

 great increase in size, the large development of the upper and 



