Turner, Morphology of the Avian Brain. 91 



il//'., metencephalon; <'^. 7'., optic tract; i?//., rhinencephalon; V.F.T., 

 ventro-frontal tuber; I'. A. 7'., ventro-lateral tuber; V.M.F., ventro- 

 median fissure; \'.M.T., ventro-median tuber. 



All surface views are drawn to the same scale. 



PLATE VI. 



Figs, i, .i. 4' 5i 8, 10. Horizontal longitudinal sections of the brain 

 of Hylocichla s-ivainsoni, beginning near the dorsal surface. A.C., 

 anterior commissure; C.F., proliferating area of the corpus striatum; 

 F.L., frontal lobe; F.M.L., fronto-median lobe; O.L., occipital lobe; 

 P.F.L., parieto-frontal lobe; Pd., peduncular tracts; P.O.F., parieto- 

 occipital lobe; T.B., tractus Biimmi. 



Fig. 2. Transverse section of a portion of the prosencephalon of 

 Sialia sia//s, showing the corpus callosum and the anterior commissure^ 

 A.C., anterior commissure; C.C., corpus callosum. 



Fig-, fj. Longitudinal-perpendicular section of the brain of Sidlia 

 sialis. Taken through the crura cerebri. C.P., proliferating area of 

 the corpus striatum. 



Fio-s. ;, 9. Horizontal longitudinal sections of a portion of the 

 prosencephalon of Hayporliinchiis riifiis, for comparison with Figs. 5, 8. 

 10. 'i\B., tractus Bummi. 



PLATE VII. 



Figs. 1, -2, 4. Longitudinal perpendicular sections of the brain of 

 Sialia sialis. C.P., proliferating area of the corpus striatum; Ep., 

 epencephalon; /.</., internal capsule; M. T'., ventricle of the optic lobe; 

 T. Til., taenia thalami. 



Fig. ,3. Mesal section of the brain of Mcleagris oallipa-'o\ A.C., 

 anterior commissure; ('. (^'., corpus callosum; t^,r//., optic chiasm; Pti., 

 pineal body; R/i., rhinencephalon; S.C., superior commissure. 



Figs. 5, 7. Horizontal longitudinal sections of the brain of Alelca- 

 gris gallipavo to the same scale as Fig. 3. A.C., anterior commisure; 

 C.C., corpus callosum; O.L., occipital lobe. 



Fig. 6. Transverse section of the rhinencephalon of the goose; a. 

 outer layer of olfactory fibres; /'., gelatinous layer; c, dense clusters of 

 Deiter's corpuscles in the gelatinous layer; d., clear granular layer; e., 

 specific olfactory cells; /., dense cluster of Deiter's corpuscles; g., epi- 

 thelium of the ventricle. 



Fig. 8. Transverse section through the middle of the rhinenceph- 

 alon of Passer domesficd. a., outer layer of olfactory fibres; b., gela- 

 tinous layer; d., clear granular layer; r., specific olfactory cells; /., 

 dense cluster of Deiter's corpuscles. 



Fig. 9. Nerve cells from the rhinencephalon of Hylociclila sxvain- 

 soni . 



Fig. 10. Transverse section through the rhinencephalon of Hylo- 

 ciclila szvaiiisoui. Nomenclature the same as in Fig. S. 



