1 20 STRONG. [Vol. X. 



forms a prominence on the ventral side of the Acusticus just 

 mesad of the foramen for the entrance of the posterior branch of 

 the latter into the auditory capsule. The ventral VII finally 

 separates from the Acusticus (852), occupying the position pre- 

 viously described (p. 1 16), and is joined by the ventral half of the 

 dorsal VII. This and what will be called hereafter the motor 

 root (VII ab) occupy the outer side of the nerve, the former 

 (% VII b) lying above the latter (VII ab). The whole nerve 

 lies close to the ventral side of the Trigeminus in contact with 

 it but not completely fused with it, i.e., there is always visible 

 a line of demarcation between the two. 



At 8o2d= the inner, fasciculus communis bundle (VII aa) 

 begins to slip ventrad past the other two so that the greater 

 part of it comes to lie below them instead of on their inner 

 side. It then soon becomes ganglionated (7^^). This ganglion 

 occupies the extreme ventral part of the V + VII, lying below 

 the other two facial components [% VII b -\- VII ab). It 

 attains its greatest dimensions when the Gasserian ganglion 

 proper is just beginning to appear in the transverse sections, 

 i.e.y one half of it lies caudad as well as ventrad of the Gasserian 

 ganglion proper. Its anterior part is fused with the ventral 

 side of the Gasserian ganglion, cephalad of 767, so that it is 

 somewhat difficult to distinguish between them at this point. 

 Finally the fibres of the fasciculus communis bundle are seen 

 emerging (760+) from the ventral part of the ganglion and 

 form the R. palatinus facialis. In about the same transverse 

 plane the other two components (>^ VII b + VII ab) begin to 

 pass ectad here from the Gasserian ganglion, a portion of them, 

 presumably that from the dorsal VII, which may now be called 

 the lateral line component, having first come into connection 

 with ganglion cells. They evidently separate, occupying the same 

 relative positions, i.e.^ the lateral line component uppermost. As 

 they separate from the ganglion these two components receive 

 on their ventral side a bundle from the ganglion of the fascic- 

 ulus com.munis component (VII aa, PI. X, Fig. 26). The 

 branch of the Facialis thus constituted is the R. hyomandibu- 

 laris. The R. palatinus VII is thus composed of the bulk of 

 the fasciculus communis component (with possibly the addition 



