TYPES OF KEPTILES. 
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The opposite, or north, side of the table-case displays the 
different modifications in the skull and teeth of living and 
extinct Keptiles. In some, like Crocodiles and Ichthyosaurs, 
the jaws are armed with a full series of sharply pointed teeth, 
while in others, like the Tortoises and Turtles, they are devoid 
of teeth and encased in horn. Very remarkable is the 
approximation to a carnivorous mammalian type presented by 
the dentition of some of the extinct Anomodonts, and equally 
Fig. 3. — Skull of Eyperodapedon, from the Triassic Sandstone of Lossiemouth, 
Elgin, Scotland (J nat. size). A, upper surface of craoium; B, palatal 
aspect of cranium ; C, underside of front of lower jaw ; Pmx, premaxil- 
lary bone ; Mx, maxillary ; PI, palatal teeth ; Md, lower jaw ; 0, orbit ; 
N, anterior nares ; S, supratemporal fossa ; >S", lateral temporal fossa. 
noticeable are the palatal crushing teeth of certain other 
members of the same group (Placochcs and Cyamodus). The 
peculiar dentition of the New Zealand Tuatera, as well of its 
extinct ally llyfcroda'pedon (fig. 3), are likewise shown. 
A 
