1 66 STRONG. [Vol. X. 



"questions the determination of the upper bundles, 7 «-/, in 

 Fig. 15, as parts of the Facial, on the ground that the ventral 

 position of the Auditory reverses the usual order." It is 

 evident that Spitzka meant by the VII the motor portion which 

 actually is ventral to the VIII and present in nearly all verte- 

 brates, possibly in all. Whether the "VII ?/ and /" which 

 disappears in the higher forms shall be also denominated the 

 VII is largely a question of terminology. 



It will now be advisable to compare the condition of these 

 nerves in the tadpole with that in the lower vertebrates. It is 

 not intended, however, to make here a complete analysis of 

 these nerves in fishes especially as I have not made any 

 extended personal investigation upon them. 



b. Comparison with the Fishes. — In considering the homo- 

 logue of this component among lower forms, Goronowitsch's 

 results on Acipenser (28) form a convenient starting-point and 

 may be analyzed as follows : Respecting the origin of the N. 

 lineae lateralis, he states that it emerges from the medulla 

 somewhat more dorsally than the Acusticus and between the 

 exits of the Acusticus and Glossopharyngeus. It derives its 

 fibres, which are coarse, from the " dorso-lateral " tract. The 

 fibres form both ascending and descending systems, the latter 

 being notably the larger, of somewhat coarser fibres and trace- 

 able to the cerebellum. The Acusticus likewise emerges from 

 the dorso-lateral tract, dorsal to the dorsal root of the VII, 

 "VII" here being used, as we shall see, in a narrower sense. 

 Its principal contingents are from an ascending system in the 

 dorso-lateral tract and a descending system traceable to the 

 lateral part of the cerebellum. The Acusticus also receives 

 fibres from the "durchkreuzten Fasern der hinteren Langs- 

 biindel," a part of which are interrupted by the cells of the 

 anterior horn. Some fibres are also received from a group of 

 large cells ventrad of the dorsal root of the VII, which latter 

 root originates from the lobus vagi. Besides these two nerves 

 from the dorso-lateral tract we have the coarse-fibred ventral 

 root of "Trigeminus II" arising from this tract. This root 

 likewise consists of contingents from ascending and descending 

 systems, the former not traceable, the latter, not distinguishable 



