CRANIAL NERVES OF SIREN LACERTINA 253 
Fig. 1 A projection of the olfactory nerve upon the sagittal plane, showing 
its double origin and distribution. 25. 
Fig. 2 A horizontal section through the olfactory glomeruli at the level where 
the olfactory nerve passes out through the orbitosphenoid bone. The double 
origin and distribution of the nerve is shown. 20. 
Vig. 3 A cross-section through the anterior nasal region, showing chiefly 
skeletal features. The rudimentary maxilla is shown. Section 60. X20. 
