Cope. ] 556 |Jan. 18, 
tuberous projection of the angle from the anterior edge of the glenoid sur- 
face. There is a deep fossa at the internal base of the postglenoid process, 
which possibly enters a foramen. No postglenoid foramen, 
Although the skull of the Oyclopidius emydinus is more robust than 
that of C. simus; the length of the tooth-line is the same. The in- 
cisive edge of the premaxillary bone displays one empty alveolus, from ° 
which the single incisor was easily shed. The canine is not large, and 
the base of the crown has a regularly convex anteroexternal face ; apex 
lost. The diastema posterior to it is equal to its diameter. The crowns of 
the premolars are worn; théy are of about the size and proportions of 
the (. siémus. The true molars differ, as I have already pointed out, in 
their greater transverse diameter, and the greater anterior prolongation 
of the anterior horns of the posterior external crescents. The deep notch 
which is enclosed between this fold and the wall of the crescent in front 
of it is filled with cementum. As to the form of the true molars, the 
transverse diameter of the first considerably exceeds its anteroposterior 
diameter ; in the (. simus the former diameter is equal to the latter. In 
O. emydinus the last true molar is as wide as its length without the heel ; 
in the C. simus, the transverse diameter is much less. In C. simus the heel 
is more prominent, and is recurved into a vertical ridge, which is wanting 
in the 0. emydinus. In 0. emydinus this tooth shows but little of the pris- 
matic character, as the roots are of usual length. 
The lower jaw of this species is not yet known. 
. 
Measurements, 
M. 
Length of skull along bases. .seesseeverss db Uae VLRO 
Length from condyles to posterior edge of ay gomatic 
FOVEM OTs vi erasin's ewibii i Weve dees cue vewlewens L042 
Length from condyles to palatonerea! foramen) ss,.44's. -.068 
My “ fo Ine Of leah true molarins ies OV 
ag ‘occipital crests to line of orbite....¢.s.03 074 
is “fi “ ‘oe etal Wetter hui, « 084 
" ie Me “ascending process of 
MALIMATY DOMES isis veView Wha dienere Wares RU mT T ie 115 
Length from occipital crest to free end of nasal bones, .126 
Elevation occiput, including condyles...... veel Vb’ 045 
hid of front at middle of orbit, without molars,. ,035 
ef ‘mexiilary bone. Ate Pty lidies iileses 015 
i Ny ih Pec A ST ge wat is tis i lst bid woe ORO 
Width of skull at occipital condyles.......... 0675 
eee superior edge of meatus audttoniaiis: 057 
fou Moe eo omiddle of zygomatie foramina, 1.4), 008 
«« Drain-case at middle of zygomatic foramina... .029 
(60 4° SUL Qt OP Dies aneus Pe en ree 083 
Me Fo os DOUWRGD. OP UI y Vaeimed eS eee ed iis cuint OMT, 
‘‘muzzle at superior edge of nares.... eas 0215 
