237 
VAN WYHE (1882, p 18), reaching from a point over the 
optic vesicles to a little distance in front of the latter. The 
dorsal end of this frontal or terminal suture, the angulus 
terminalis, according to HIS, represents the fore-end of the 
medullary suture or the dorsal brain axis, its ventral 
-extremity, the recessus infundibuli, the termination of the 
dorsal suture 
Angulus terminalis — 
(anterior end of the floor after Kupfferf) > ii 
after His: frontal suture 
after Kupffer: primary floor 
> 
anterior end of the floor”; e 5 
after His. involution S 
ja 
= 1 
notochord, 
Fig, 15. Diagram oi the Craniate brain and its main axis 
from FRORIEP, 1894 (Ergebn. Anat. Entw. III). 
Axis cf the medullary plate or the basal brain axis, its 
middle, about the recessus opticus, the fore-end of the 
median brain-axis. Thus the brain does not end in 
The existence of such a suture in front of the recessus 
neuroporicus or angulus terminalis is, however, denied by 
V. KUPFFER (1894, p. 102). 
isde he ere of the neuropore in Urodelans and 
Anu haps some observations made by me on the 
choinrre of t the cerebral plate in Amphibians may contribute 
