REPTILIA. 



583 



upon itself, the representatives of the scala vestibuli, of the scala 

 tympani, and of iliefenestra rotunda of the human ear can be dis- 

 tinctly identified. 



(641.) The glosso-pharyngeal and pneumogastric nerves in Rep- 

 tiles supply the same or- Fig. 265. 

 gans to which they are dis- 

 tributed in the human sub- 

 ject ; the former being 

 destined to the base of the 

 tongue and the muscles of 

 the pharynx; while the lat- 

 ter, assuming a plexiform 

 arrangement, are appro- 

 priated to the lungs and 

 heart, as well as to the 

 oesophagus and the sto- 

 mach. 



(642.) The hypoglossal 

 pair of the cerebral nerves, 

 which was not met with in 

 Fishes, now becomes dis- 

 tinctly apparent ; and, as 

 in the higher Vertebrata, 

 may be traced in the mus- 

 cles of the tongue. 



(643.) The spinal system 

 of nerves offers no peculia- 

 rity worthy of special de- 

 scription. In the annexed 

 figure, taken from Boja- 

 nus, the nerves derived 

 from the medulla spinalis 

 are seen to issue in the 

 usual manner from the 

 intervertebral foramina ; 

 and they evidently essen- 

 tially correspond with the 

 grand type of structure 

 common to the vertebrate classes. In the apodous Reptilia, as 

 for example in the Serpents, to attempt to divide them into the 

 usual regions is clearly absurd ; but in quadrupedal forms, as 



