NOTES ON THE CANIDAH OF THE WHITE RIVER OLIGOCENE. 393 
slender and delicate, is relatively very much less so than in Canis, in which genus the 
fibula has undergone a more extensive reduction than in Cynodictis. Another difference 
from the recent forms is to be found in the fact that the fibula is not so closely applied to 
the tibia, the two bones coming into contact only at their proximal and distal extremities. 
The distal end is expanded and thickened to form a stout external malleolus, which is 
somewhat smaller than in Daphenus or Dinictis, but of much the same shape, and has 
on its outer side a deep suleus for the peroneus tertius tendon. The distal tibial facet is 
a narrow band, with its long diameter directed antero-posteriorly ; obscurely separated 
from it is the larger, subcireular facet for the astragalus. 
Measurements. 
No. 10493. No. 11012. No. 11381. No. 11382. No. 11482. 
elivista eng thisacenessw sees senses seeeceih fae cactcvveceee cot tseseecoskenscseoees | 20.064 
name Dueadthyatracetabulumsecs::-coce:.nccocsseresseckcseneceeececsceace eeeeOsG 037 
Ilium, length fr. acetabulum..............2...00. sesceesceeesenenseseeeeee ?.033 037 
eee OLeACthvotspedunCleracercersereceriaasenet sticneesecsessecesesen ees -011 -010 009 
of See as v amlbenplatencesaa-cseccrossecccesssncseoserereaves cnemen ;  -013 
Ischium, length fr. acetabulum............0...sseesescsseneeeeceeeeeeeeees | 027 26 
Acetabulum, fore-and-aft diameter ..........2.c2ceecccecesesees avceseee | .008 -O11 
IDET, NOMEPH Ncceceseoc cencaanc6 -coossqueqcacouaoDoDNcHopcooooSenpSEDDo gHONIEGCS 095 | .085 -086 
Smee breadthtoMproxmend ees testce tee ceee ence eee ee | | 017 020. | 015 .016 
se «« _ ** distal end... | .016 017 -014 014 
PATS, Toray hase cess oa er i ge | 089 .099 
Cembreadthvofproxaendeessmerse tie eee eters cece | | ls 018 | .014 | .014 
‘« thickness of prox. end | 013 016 -012 012 
«« breadth of distal end........ iat 009 .O1L 012 | 009 -009 
Fibula, thickness of prox. end -007 | 
os ns Sex dastaliendissccesc.ssecesescosseccteeseceesstectec crs 0065 009 | 
VIII. Tux Pres (Pl. XX, Fig. 24). 
The general appearance of the hind foot recalls that of the viverrines. The astra- 
galus is quite like that of Daphenus, but with some differences which tend in the direc- 
tion of the modern Canidae, this bone in Cynodictis standing intermediate in structure 
between the two extremes, though somewhat nearer to Daphenus. The proximal or 
tibial trochlea is but little more deeply grooved than in the latter genus, and is therefore 
much shallower than in Canis, but its borders have the same clean-cut angularity as in 
the modern forms, instead of curving gradually into the facets for the tibial and fibular 
malleoli. Im Canis the tibial trochlea is extended over upon the dorsal side of the neck, 
but this is not the case in either of the White River canines. The neck of the astraga- 
