PAL.^OSYOPS LEIDY, AND ITS ALLIES. 
293 
occipital region of the skull in both forms is closely similar, although the auditory 
processes and glenoid articulation are different. 3. — The elongated zygomatic fossa 
and the position of the orbit is similar in both forms. 4. — The orbital processes are 
moi’e developed iu Palceosyops than in Tapirus. 5. — The facial region of this 
species is quite different from that of the Tapir. 6. — The zygomatic arch is 
much stronger and more bear-like than in the Tapir’sskull. 7. — The separation 
of the foramen ovale from the foramen lacerum medium is different from that of the 
Tapir in which these two foramina are fused into one. 
Skull Measukements. 
P. paludosus- 
M. • 
P. megarhinus 
M. 
L. laticeps 
M. 
P. Isevidens. 
M. 
T. cultridens. 
Basal length of cranium 
Length from premaxillary to ant. 
■420 
•355 
■420 
border of orbit 
Vertical height of skull at ant. 
•170 
•125 
•142 
•125 
•165 
border of orbit 
Length from i)remaxillary suture 
•084 
•095 
•082 
•110 
•105 
to postglenoid 
•345 
•285 
•370 
■310 
Length of na.sals .... 
•125 
•100 
Length of nasal notch • . . ‘ . 
•115 
■084 
•112 
•110 
■125 
Length of orbit 
•035 
■045 
•050 
0-45 
•055 
Length of floor of orbit at middle 
•056 
•064 
•054 
•070 
Length of temporal fossa 
Vertical height of temporal fossa 
•200 
•210 
•225 
at middle .... 
Anterior border of orbit to end of 
•115 
•100 
•110 
postglenoid process 
Greatest distance of z 3 'goma from 
■220 
■ 160 
— 
skull (one side) 
•140 
•092 
■145 
■090 
Height of occiput 
Width of occiput between post- 
■133 
■105 
•140 
— 
tympanies .... 
■165 
•140 
•210 
Total width of condyles 
■098 
•098 
•100 
•092 
Width of fi>ramen magnum 
•043 
•037 
■030 
Length of palate .... 
•180 
•165 
■180 
•180 
•220 
Width of palate between canines 
Breadth of skull between post- 
•050 
■045 
■050 
— 
■052 
orbital processes 
Length of premaxillaries along | 
•1,35 • 
•150 
palate 
Length of sui^erior border of pre- i 
•084 1 
■025 
•042 
•053 
maxillaries . . . . ! 
•080 i 
•065 j 
■OtiS 
•095 
AXIAL SKELETON. 
Getteral Characters . — The collection of Princeton College contains a series of 
eleven vertebrm, which belong to this species. Of these there are three cervicals, 
six dorsals from the same individual, another dorsal from the posterior limit of this 
