635 
the specimens, though when the brains were removed, the attachment 
of this region to the floor of the cranium was evident. The Prosen- 
cephal overlaps the Diencephal except in the small portion occupied 
by the epiphysis, but the two portions of the brain are quite distinct 
as shown by Fig. 10. This figure also shows the very thin floor of 
N 9 __.Rhinen. 
: = 0b. 
--. Prosen. 
---Mesen. 
Af --Epen. 
\ i Meten. 
Wi 
Fig. 2. Fig. 3 
Rhinen. olf. Prosen. Mesen. tr. 
Fig. 5. 
Fig. 1. Brain of a California horned toad. Dorsal 
view, X 3. Rhinen. Rhinencephal. olf. olfactory tract. 
Prosen. Prosencephal. Meten. Metencephal. ep. Epi- 
physis. NMesen. Mesencephal. Zpen. Epencephal. 
Fig. 2. Brain of a snake. Dorsal view, X 3. 
. Fig. 4. Fig. 3. Brain of Anniella pulchra. Dorsal view, 
4 X. 10. tr. trigeminous lobe. My. Myelencephal. 
: Fig. 4. Brain of Anniella pulchra. Ventral view, X 10. 2 second pair of cranial 
nerves. 5 fifth pair of cranial nerves. 
Fig. 5. Brain of Anniella pulchra. Lateral view, X 10. 
the Prosencephal next to the Diencephal. On the left side of this 
figure, is the narrow porta or foramen of Monro, connecting the dia- 
coele or cavity of the “Between Brain” with that of the fore-brain. 
As the section is not quite transverse, the porta on the right side is 
not shown. 
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