NOTES ON THE DEVELOPMENT OF THE NEWT. 589 
Fic. 29.—Transverse section through the head end of a Frog embryo, 
showing the origin of the facio-auditory nerve as an outgrowth from the dorsal 
surface of the hind-brain. The thickening of the nervous layer of epiblast to 
form the ear is also shown. 
Fig. 30.—Transversé section through the posterior part of the trunk of the 
same Frog embryo shortly after the closure of the medullary canal, to show 
the neural ridge. 
Fies. 31—35.—Transverse sections through the same embryo as that from 
which Figs. 24 and 26 were taken, but posterior to them. 
Fig. 31. Showing on the right the ganglion and the dorsal and pre- 
branchial branches of the 7th nerve; on the left the ear and the root 
of the 8th nerve, and the 1st visceral cleft. 
Fig, 32. Showing on the right the ganglion of the 7th nerve ; on the left 
the ear and the post-branchial branch of the 7th nerve. 
Fig. 33. Showing on the right the ganglion and pre-branchial branch of 
the 7th nerve ; on the left the ganglion and pre-branchial branch of the 
9th nerve. 
Fig. 34. Showing on the right the ganglion and pre-branchial branch of 
the 7th nerve; on the left the root, ganglion, and dorsal branch of 
the 9th nerve, and also the 2nd visceral cleft. 
Fig. 35. Showing on the right the ear and post-branchial branch of the 
7th nerve; on the left the ganglion and post-branchial branch of the 
9th nerve. 
Fies. 86—38.—Transverse sections through the head end of an embryo, to 
show the relation of the pituitary body to the fore-gut and infundibulum. 
Fig. 36. Showing the fusion of the posterior face of the pituitary body 
with the wall of the fore-gut. It also shows the ear and the ventral 
fusion of the 7th nerve with the epiblast of the dorsal wall of the Ist 
visceral cleft. 
Fig. 37. Slightly anterior to the preceding, showing the pituitary body in 
close contact with the wall of the infundibulum. It also shows on the 
left side the ear, the ganglion of the 7th nerve, and the ventral fusion 
of the nerve with the epiblast. 
Fig. 38. Showing the free tip of the pituitary body in close contact with 
the wall of the infundibulum. 
VOL. XXVI, PART 4.—NEW SER, QQ 
