_Figures 1, 2, 3, 4, and 6, natural size._
Ithygrammodon cameloides.
Fig. 1.--Left premaxillary, inner view.
Fig. 2.--Left premaxillary, outer view.
Fig. 3.--Right maxillary and premaxillary, outer view, premolar, with dotted
outline indicating its probable position.
Fig. 4.--The premaxillaries in position (probable), view from above, showing
size and position of the incisors. Dotted lines indicate the premaxillary
spine (estimated).
Procamelus occidentalis, Cope, (See Wheeler's Survey, vol. iv., Plate
LXXVII.)
Fig. 5.--Part of right maxillary and premaxillary, showing single incisor
with rudimentary alveolus for a second.