176 NERVE COMPONENTS OF BONY FISHES. 



development of the vascular arches in Lepidosteus and 

 concludes that (in spite of the anomalous innervation) the 

 pseudobranch is a spiracular (mandibular) gill, while the 

 "hyoid gill" is the demibranch of the anterior wall of the 

 first gill cleft. 



I am inclined to doubt the participation of the IX nerve 

 in the innervation of the teleostean pseudobranch in any 

 case. In Gadus I am sure that its nerve supply comes 

 from the facialis. 



For the morphological discussion of this nerve see the 

 pages immediately preceding. 



VI. — The Ramus Palatinus Facialis. 



After its separation from the nerve last described, the 

 r. palatinus runs forward along the dorsal surface of the 

 m. adductor arcus palatini and beyond the cephalic edge 

 of that muscle (400) reaches the mucous lining of the 

 roof of the mouth near the median line, which it follows 

 up to the tip of the snout. This epithelium is richly sup- 

 plied with taste buds and gland cells during almost the 

 whole of this course and both of these are supplied by 

 this nerve. 



Stannius states (p. 55) that in fishes which have a well 

 developed sub-cranial canal (" Augenmuskelcanal") the 

 r. palatinus traverses it on the way to the roof of the mouth. 

 This certainly does not apply in the case of Menidia. 

 The sub-cranial canal is well developed, but the r. palat- 

 inus does not enter it, but runs along the outer side of the 

 canal, not the inner, as Stannius describes in his types. 



VII. — The Truncus Infra-Orbitalis. 



This trunk (/. inf. ) contains the following nerves : the 

 r. mandibularis V, the r. maxillaris V and the r, buccalis 

 VII. It receives the following components: the general 



