298 NERVE COMPONENTS OF BONY FISHES. 



Figure 8. — Projection of the fourth spinal nerve upon the trans- 

 verse plane, X 33- This and the other diagrammatic cross-sections 

 (figs. 9 to 12) are conventionally colored to correspond with the colors 

 of fig. 3. They were constructed by the superposition of a series of 

 camera lucida outlines of transections. They are diagrammatic, but 

 not hypothetical, since no components are entered save those actually 

 observed in the sections. 



Figure 9. — Similar projection to exhibit the composition of the 

 vagus nerve. 



Figure 10. — Similar projection to exhibit the composition of the 

 glossopharyngeal nerve. 



Figure 11. — Similar projection to exhibit the composition of the 

 facial nerve. 



Figure 12. — Similar projection to exhibit the composition of the 

 trigeminus nerve. 



Figure ij. — Diagram of the relations of the eye-muscle nerves of 

 Menidia. To be compared with fig. 12 of AUis' paper, '97. 



Figure i^. — Similar diagram of the eye-muscle nerves of Ara- 

 blystoma. 



Plate VI. 



Figure /j. — Transection of the oblongata of a young specimen of 

 Mugil cephalus L., the striped mullet, taken at the extreme caudal 

 end of the lobus vagi, + 50. Shows the spinal V tract entering the 

 nucleus funiculi, the caudal part of the nucleus ambiguus and lobus 

 vagi and the cephalic ends of the paracentral nucleus and ventral 

 comu. 



Figure 16. — Transection of Menidia at the level of the first spinal 

 nerve c (714), X 50. Shows the ventral root arising from both the 

 ventral cornu and the fasciculus longitudinalis dorsalis, also the com- 

 position of the brachial plexus. 



.Fz^z^r^ 77. —Transection of Menidia through the lobus vagi and 

 emerging vagus roots (640), X 50. The section includes the caudal 

 tips of the cerebellum and tuberculum acusticum. 



Figure 18. — Transection of Menidia through the tuberculum acus- 

 ticum and cerebellar crest (605), X 50. The section shows the central 

 courses of the sensory and motor IX and the apparent origins of the 

 r. lateralis vagi and the caudal root of the VIII. 



Figure ig. — Transection of Menidia at the apparent origins of the 

 VIII and VII nerves (577), X 50. The cerebellar crest fuses with 

 the lateral lobe of the cerebellum. 



Figure 20. — Transection of Menidia at the level of the apparent 



