is com 
223 
wissen and deuterencephalon. — The Craniate brain 
os 
two parts of different origin, the first 
being the eee part which represents nothing else but the 
Fig. 13 
eran of the development of the Craniate 
A Archencephalon, cn neurenteric canal, cw 
D deuterencephalon, ek ectoderm, 
en sdntldnd: IT infundibulum, f lamina ter- 
minalis, M mesencephalon, Ms spinal chord, 
notochord, np neuropore, P prosence- 
phalon, pn processus neuroporicus, pr plica 
AE ndr deg pv plica ventralis, 
cephalon, r olfactory placode, ro 
recessus optica fp tuberculum posterius. 
after KUPFFER, 1906, p. 13, 14). 
anterior, somewhat dilated, end of the former stomodaeum, 
a : 
