Studies on Avian Anatomy. — II. 
39 
Ur., Ureter. 
1., First cranial nerve. 
11., Second cranial nerve. 
111., Third cranial nerve. 
IV. , Fourth cranial nerve. 
V. , Fifth cranial nerve. 
VI. , Sixth cranial nerve. 
VII. , Seventh cranial nerve. 
VIII. , Eighth cranial nerve. 
IX. , Ninth cranial nerve. 
X. , Tenth cranial nerve. 
XI. , Eleventh cranial nerve. 
XII. , Twelfth cranial nerve. 
All the figures are drawn from free hand sketches. Those of Geococ- 
cyx and Bubo are mostly drawn life size, and have been reduced one- 
half in the reproduction. Those of Aeronautes are mostly twice life 
size, some three times, and have been reduced one-third. In all cases 
the lateral view of the pecten of the eye is three times life size, and 
the view from the apex a little more than three times. 
Plate I. 
Geococcyx calif ornianns. 
Fig. 1. Ventral view of the brain. 
Fig. 2. Dorsal view of brain, with outline of head and nostrils. 
Fig. 3. Brain viewed from left side. 
Fig. 4. Dorsal view of sacral plexus. 
Fig. 5. Lateral view of pecten of the eye. 
Fig. 6. Pecten seen from its free apex. 
Fig. 7. Median longi-section of brain. 
Fig. 7a. Dorsal view of brachial plexus. 
Fig. 8. Female excretory organs, ventral view. 
Fig. 9. Female urogenital organs, ventral view. 
Fig. 10. Dorsal view of tongue and glottis. 
Fig. 11. Ventral view of the posterior portion of alimentary 
tract. 
Fig. 12. Ventral view of internal nares and aperture of Eusta- 
chian tube. 
Fig. 13. Dorsal view of duodenal loop and pancreas. 
Plate II. 
Geococcyx calif ornianus. 
Fig. 14. Superficial muscles of breast and inner arm. 
