CREODONTA. 295 



Broken metapodial bones are slender and straight. The proximal end 

 of a metacai-pal does not display the interlocking lateral articulation. Two 

 phalanges are depressed in form. 



Measurements. 



M. 



( anteroposterior 0145 



Diameters of a dorsal centrum.? vertical 0075 



( transverse 0115 



Diameters of glenoid cavity scapula ^^°'''™P°8*e"°'' ^^^S 



< transverse 0090 



Depth of olecranon 0110 



Width of bead of radius , 0110 



Width of neck of ilium anteroposteriorly 0120 



Diameter of shaft of tibia at middle 0085 



e anteroposterior 0180 



Diameters of astragalus^ greatest J of trochlea 0140 



' transverse ( of head 0100 



Length of head 0070 



Length of calcaneum 0300 



Width of calcaneum at sustentaculum .0140 



Width of cuboid facet 0066 



Length of cuboid 0120 



, , .( anteroposterior J '^t^l ^'^"^ 



Diameters of cuboid.^ I proximal 0075 



( transverse proximal 0098 



vertical 0050 



transverse 0100 



Diameters of navicnlar < 



anteroposterior^ ^•*'>t'i^«™«ity 0100 



c without tuberosity 0070 



As already remarked, it is possible that the semi-grooved trochlea of 

 the astragalus of this species is an indication that the genus Prototomus 

 must be retained as distinct from Stypolopkus, to which the present species 

 probably truly belongs. 



The specimen described, together with the mandibular ramus of an- 

 other, supporting the last two molar teeth, were found in the bad lands of 

 Wind River, Wyoming, by Mr. J. L. Wortman. A third specimen was 

 found by Mr. Wortman in the true Wasatch bed of the Big Horn River 

 region. This includes a large part of a skull, with one mandibular ramus 

 almost perfect, with an incomplete ulna and fibula. With the aid of the 

 lower jaw I have restored the skull (see Plate XXV d; fig. 1), the occipital 

 region only being inferential. This I have modeled after that of Stypolo- 

 phus caylusi Filh., of which I possess a cast given me by the kindness of 

 Dr. Filliol. 



