FATE OF THE BLASTOPORE IN RANA TEMPORARIA. 53 
continued posteriorly from the point ne. My figs. 6 and 7 also 
show this. 
Mr. Durhanr’s drawings also are all taken from a later stage, 
but are not intended to illustrate the history of the blastopore 
but the fact of there being a neurenteric canal. In the earliest 
stage which he figures, the rectum is the ventrally inclined 
diverticulum, and is shown exactly as I find it. The blasto- 
pore is occluded previously to this stage. 
Only one series out of over sixty has failed to show this 
history. It was abnormal iu other respects than the blasto- 
pore, and was pi’obably pathological altogether. 
In conclusion, I wish to express my sincere thanks to Pro- 
fessor Milnes Marshall for looking at my specimens, and 
also for much kind advice in reference to the subject of this 
paper. 
