1892.] NATURAL SCIENCES OF PHILADELPHIA. 319 



M, is much smaller tbau m, and in some species is greatly reduced ; it 

 is of simple tritubercular pattern, without hypocone or conules. The 

 lower premolars are much compressed and have posterior cusps. 

 Ml has an extremely high trigonid which, however, forms but a 

 primitive sectorial blade, as the paraconid retains its internal posi- 

 tion and the protoconid is but little enlarged, except in height, con- 

 spicuously exceeding in this respect the other two cusps which are 

 of nearly equal size. Consequent on this arrangement the shear- 

 ing surface is anterior rather than external ; the talon is low and 

 basin-shaped. ^ is very much smaller than ^i and has a tubercu- 

 lar crown, but, as Cope has pointed out, this tooth is clearly derived 

 from a tuberculo-sectorial, all the elements of the trigonid being 

 still preserved as small but acute cusps, which rise slightly above 

 the level of the talon. 



The skull, so far as it is known, is of the ordinary creodont type, 

 with short tapering face, orbits far forward and deep postorbital 

 constriction. The mandible has a long and narrow horizontal 

 ramus, with very narrow symphyseal portion. The lumbar vertebrae 

 have the creodont type of zygapophyses ; the metapophyses and 

 anapophyses are small. The humerus has small tuberosities, a wide 

 bicipital groove and very prominent deltoid ridge ; an entepicondy- 

 lar foramen is present. The ulna has the very high olecranon so 

 general among creodonts; the sigmoid notch is deep, but the 

 humeral facet small; the shaft is very broad. The radius has a 

 transversely oval head, which occupies most of the humeral trochlea. 

 The carpus is very low, the scaphoid and lunar separate, and the 

 unciform shaped as in the viverrines (e. g., Arciictis). The pollex 

 is short and relatively rather stout, the other metacarpals much 

 more slender; though proportionately much weaker, the general 

 character of the metacarpals and phalanges is quite like that in the 

 viverrines, and the interlocking of the metacarpals is similar. 

 No. II touching the magnum and No. Ill the unciform though 

 not by extended surfaces. The ungual phalanges are compressed and 

 sharp and very like those of Cynogale, without the cleft at the tips 

 which occurs in nearly all creodonts. 



The ilium is short and prismatic. The femur has a slender com- 

 pressed shaft and a very large 2nd and small but distinct ord tro- 

 chanter. The tibia is long and slender, Avith gentle sigmoid curva- 

 ture ; the astragalar surface is but obscurely grooved and the large 

 malleolar process has an articular surface upon the distal end. The 



