Visual System in a Lizard 
85 
Figure 3. Layers of the mesencephalic tectum in the Tegu lizard as identified by the criteria of Ramon 
(1896). A high magnification view (A) is a 90° rotation of the area in the box shown at low magnifica- 
tion view (B). Reprinted with permission of Elsevier Publishing Co. {Brain Research, 85, 1975. p. 223). 
comparative observations on Lacerta vivi- 
para (Armstrong, 1950) ; Xantusia vigilis 
(Butler, 1974) ; Iguana iguana and Anolis 
earolinensis (Butler and Northcutt, 1971) ; 
Tupinamhis nigropunctatus (Ebbesson, 
1970) ; Gekko gecko (Northcutt and Butler, 
1974a). 
Dorsal Thalamus 
In all lizards studied, a projection from the 
retina to the contralateral dorsal lateral 
geniculate has been observed. With the ex- 
ception of Lacerta (Armstrong, 1950), the 
other lizards also have an ipsilateral projec- 
