\ 
/ 
200 
Limb bud 
300 
400 
500 
600 
80S 00 00000DS000B 
J700 
Fig. 4. A projection upon the horizontal plane of the central nervous system: 
and myotomes of larval Amblystoma punctatum, early swimming stage. X 25. 
This projection is reconstructed to scale from transverse sections of 10 yu in 
thickness, the serial numbers of the sections being indicated at the right. 
69 
