264 
HILT. 
REFERENCE LETTERS. 
Cartilage. 
Cerebrum. 
Cerebellum. 
Choroid plexes. 
Posterior epiphysial vesicle. 
Anterior epiphysial vesicle. 
Primary fore-brain. 
Frontal bone. 
Integument. 
Boundary between prosen- 
cephalon and thalamen- 
cephalon. 
Organ of the lateral line. 
Mid-brain. 
Medulla. 
Me. Sut. Median suture of frontal 
bones. 
Mt. Col. Colloid (?) mass. 
Nast. pt. Nasal pit. 
iV. Nerve-fibres in stalk of epi- 
physis. 
iVrv. cl. Nerve-cells in epiphysis. 
Opt. ves. Optic vesicle. 
P. Posterior commissure. 
far. Paraphysis.” 
Prs. en. Prosencephalon. 
Re. Recessus infrapinealis. 
S. Superior commissure. 
Vs. Sng. Blood-vessels. 
3 wv. * Third ventricle. 
The figures were all made from camera outlines. 
