Herrick, Nerve Components of Bony Fishes. 433 



5. — There is a branch of the vagus for the m. trapezius, 

 /. ^., a true spinal accessory nerve, in Menidia. Section 

 5, IX. 



IV. — Special Results. 



Among the more specific results to which attention is 

 especially invited are the following: 



I. — The fasciculus communis and associated structures 

 of the Ichthyopsida are in a general way homologous with 

 the fasciculus solitarius and its associated structures of 

 the Amniota, though the homology is not exact. 



2. — The innervation of the pseudobranch from the 

 facial nerve supports Maurer's later view that the teleos- 

 tean pseudobranch represents a spiracular demibranch or 

 mandibular gill. This organ is very highly developed in 

 Menidia and has invaded the post-spiracular or hyoidean 

 region of the pharynx so that the pre-trematic ramus of 

 the IX nerve has entirely disappeared. 



3. — The nerve to the pseudobranch represents a pre- 

 trematic ramus of the facialis and supplies the adjacent 

 pharyngeal mucosa. This nerve coexists in some fishes 

 with the chorda tympani, or pre-spiracular extension of 

 the communis component for the hyoid and mandibular 

 arches. The chorda is absent in Menidia and the post- 

 trematic r. mandibularis internus VII of fishes cannot be 

 homologized with it, though in higher forms it is possible 

 that the two nerves fuse into a common trunk. 



4. — The ophthalmicus profundus is apparently repre- 

 sented by a vestigeal bundle of general cutaneous fibres 

 which run out from the Gasserian ganglion with the radix 

 longa of the ciliary ganglion. Having reached the latter 

 ganglion, they can no longer be traced. 



5. — The sensory epithelium of the olfactory organ 



