Fig. 283.— Skulls of reptiles. 



A, Dorsal view of the skull of the tuatara (Spkenodon) ; J2, the same view of the 

 skull of the grass snake {Tropidonotus natrix\ with small portions of the lower 

 jaw ; Cj dorsal, and C, ventral views of the skull of a crocodile. 



l.t.f.i lateral temporal fossa; lac, lachrymal; «*jr., maxilla; «., nasal; «.*., 

 notch into which fits the fourth tooth of the lower jaw; 0.1., opening into which 

 fits the first tooth of the lower jaw ; o.c. t occipital condyle ; ord., orbit ;/.«., pos- 

 terior nares ',P-p.v, t posterior palatine vacuity; /ar. t parietal;//., palatine; 

 pm., premaxilla; prj, % prefrontal; Pro,, prootic; /*., pterygoid; ptf. t post- 

 frontal; pto.y postorbital; y., quadrate; g.j\, quadratojugal ; s.oc. t supra- 

 occipital; sq. t squamosal; st./.y supratemporal foramen; tpt, t transpalatine. 

 For the lizard and turtle, see Figs._4.16 and 285. 



Note that the tuatara and crocodiles have both supratemporal and lateral tem- 

 poral fossa, the ljzeird, being without quadratojugal, has no lateral temporal fossa, 

 the snake has neither fossa, and the turtle should have a supratemporal fossa, but 

 this is covered by plates of bone from the parietal and squamosal. 

 Compare Fig. 278. 



39° 



