46 



University of California Publications. [Geology 



There are still a number of characters separating them which 

 may as a whole distinguish the groups sufficiently to permit our 

 continuing them as distinct genera. Ailurictis appears, however, 

 to be closely related to the American genera and to represent the 

 same division of the Felidae. 



MEASUREMENTS. 



Skull of Archaelurus debilis major, No. 1681. mm . 

 Axial length from anterior side of premaxillae to posterior side of oc- 

 cipital condyles 225 



Axial length from anterior side of premaxillae to anterior side of infe- 

 rior narial openings 87 



Greatest width across zygomatic arches 150 



Width of palate between inner roots of P 4 56 



Height of inion above foramen magnum 39 



Height of anteroinferior side of orbit above alveolar border at P 4 36 



Length, anterior side of superior canine to posterior side of M 1 81.5 



Length, anterior side of P 3 to posterior side of M 1 48 



Superior canine, length, tip to alveolar border on incompletely erupted 



tooth 38 



Superior canine, antero-posterior diameter at base 16.5 



Superior canine, transverse diameter at base 9.2 



P 1 , antero-posterior diameter 3.9 



P 2 , antero-posterior diameter 6.6 



P 3 , antero-posterior diameter 20.5 



P 4 , antero-posterior diameter 24 



P 4 , transverse diameter across inner root gfj.. 15 



M 1 , antero-posterior diameter 5.7 



M 1 , transverse diameter 8 



Limbs. — Several specimens in the University collection show 

 considerable parts of the appendicular skeleton of feline forms 

 which are very near Archaelurus. Among these there is a hind 

 limb, No. 2256 (pi. 5, fig. 1), lacking only the terminal pha- 

 langes. This furnishes for the first time sufficient material for 

 satisfactorily determining the foot structure in this group. The 

 specimen evidently represents a form close to A. clebilis, though 

 somewhat larger. It is here tentatively referred to A. debilis 

 major. 



The femur is much like that of Nimravus gomplioclus as de- 

 scribed by Cope. 35 It differs from this type in that there is no 

 groove connecting the shallow pit for the round ligament with 



35 Tert. Vert., p. 970, PI. 74, Fig. 2. 



