A deeper section through the thalamencephalon, corresponding to B in (1).
"Text Book of Biology, Part 1: Vertebrata" by H. G. Wells
The Thalamencephalon is much reduced.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7" by Various
Cerebrum (Primitive Fore-brain) < Thalamencephalon (Diencephalon).
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3" by Various
The thalamencephalon in fig.
"The Works of Francis Maitland Balfour, Volume 1" by Francis Maitland Balfour