PLATE 35 
EXPLANATION OF FIGURES 
126 Diagram of a transection through the hemispheres of an embryonic teleost, 
showing the relations of the four primitive columns. 
127 Diagram of a transection through the hemispheres of an adult teleost, 
showing the changes which have taken place through rearrangement of these 
columns. For approximate level see fig. 125 
128 Diagram of a transection through the diencephalon of an embryonic tele- 
ost, showing the relations of the same columns. Practically the same conditions 
hold in the adult. (For level see fig. 125.) 
129-134 Diagrams of transections through the cerebral hemispheres of Ameiu- 
rus, at the level of the anterior commissure, showing the shifting which takes place 
with the gradual eversion of the tenia. Figs. 129 to 133 are camera lucida drawings 
obtained through the kindness of Dr. James M. Wilson, of Washington, D. C. 
Fig. 129, 5 mm. stage; fig. 130,6mm. stage; fig. 131, 9mm. stage; fig. 132, 10 mm. 
stage; fig. 133, 12-13 mm. stage; fig. 134, adult. 
135 Transection through the cerebral hemispheres of Amia calva in the region 
of the anterior commissure, to illustrate the eversion of the hemisphere wall, 
after Mrs. Susanna Phelps Gage (793). 
1, pars dorso-medialis hemisphaerii and epithalamus; 2, pars dorso-lateralis 
hemisphaerili and pars dorsalis thalami; 3, pars ventro-lateralis hemisphaeri 
and pars ventralis thalami; 4, pars ventro-medialis hemisphaerii and hypo- 
thalamus; epithal., epithalamus; hypothal., hypothalamus; pars dors. thal., pars 
dorsalis thalami; pars vent. thal., pars ventralis thalami; s. lim. tel., sulcus 
limitans telencephali; sulc. dien. dors. suleus diencephalicus dorsalis; sulc. dien. 
med., suleus diencephalicus medialis; sule. dien. vent., sulcus diencephalicus 
ventralis. 
