230 STRONG. 



EXPLANATION OF PLATE XII. 



A. A reconstruction of the V, VII, IX, and X nerves of the tadpole, showing 

 the different components of these nerves in different colors. One half the head 

 is shown in a horizontal plane and dorsal aspect (see also text, p. 107). X 35. 



B. A reconstruction showing the roots of the V, VII, and VIII nerves, the 

 first two as far as the Gasserian ganglion. Lateral aspect. 



C. A reconstruction showing the roots of the V and VII nerves in the Am- 

 blystoma larva. Dorsal aspect. 



The eye, ear, and brain are indicated in faint neutral tint, with dotted outlines, 

 portions of the brain being omitted, however, where it overlaps certain of the 

 nerves. 



