J. L. Bremer 463 
neuropore, two other areas, shown in the model, where the ectoderm of 
brain and skin are continuous; one in the mouth region, and one behind 
(following the curve of the brain) the neuropore. Moreover just be- 
hind this last area there is a distinct prominence of the brain tube, not 
Fie. 7. Drawing of whole embryo. X 30. 
attached to the skin, which simulates a neural crest, as though for a 
pair of cranial ganglia. This of course must soon disappear, as no such 
pair of ganglia exists at a later period, but its presence is interesting as 
showing a tendency of this anterior portion of the brain to develop as 
do the more posterior portions. 
