Forebrain and Midbrain of Lizards 
47 
Figure 17. Photomicrograph of a transverse section through the optic tectum of the tuatara, 
Sphenodon. Abbreviations and bar scale same as Figure 15. Note well-developed and highly 
laminated periventricular zone, poorly developed central zone and large retinal lamina 12 in 
contrast to very thin retinal lamina 14. 
