502 WILLIAM H. F. ADDISON 
and human brain anatomy. In the description of the figures 
as given below, I have followed closely the nomenclature used 
by Beceari (710, ’11), who studied in Edinger’s laboratory. 
The regio olfactoria (olfactory lobe) is seen in figures 1, 2 and 
3, to consist of bulbus olfactorius (which receives the processes 
Fig. 1 Base of brain of rabbit (Lepus cuniculus), a macrosmatic animal with 
small pallium. Shows great development of olfactory and parolfactory struc- 
tures. These extend the entire length of the brain, and include all parts desig- 
nated by letters, mesial to the fovea limbica. > 1}. 
Fig. 2. Base of brain of calf (Bos taurus), a moderately macrosmatic animal, 
with increased size of neopallium. The parts of the cerebrum mesial to the 
fovea limbica, and anterior to and including the region marked l.p., belong to the 
palaeencephalon, and are all olfactory and parolfactory structures. The remain- 
ing parts of the cerebrum shown are neencephalic. The lobus pyriformis is much 
reduced and ends by merging with the uncus of the gyrus hippocampus. The 
increased size of the neopallium is better seen from the lateral aspect. > 4. 
Fig. 3 Portion of base of adult human brain, microsmatie and having great 
development of neopallium. The olfactory bulb is small, and the peduncle is 
much elongated. The eminentia parolfactoria is small, or may be nearly wanting. 
The remains of the lobus pyriformis are within the vallecula Sylvii, and have be- 
come overgrown by and fused with the temporal lobe. The extent of the lobus 
pyriformis is more distinctly seen in the brain of the 5-month fetus. X 3. 
