106 CHARLES BROOKOVER 



system by way of the fifth nerve, since a sphenopalatine ganglion 

 is mentioned in anatomical works in connection with the fifth 

 nerve which sends fibers into the nasal capsule of higher verte- 

 brates and Sheldon ('08) reported a ramus of the trigeminus 

 nerve running into the nasal capsule of the carp. But in none of 

 my Weigert preparations could I find fibers in Amia entering the 

 nasal capsule in close proximity to the ganglion cells of the nervus 

 terminalis. It may be that a few non-medullated fibers reach the 

 ganglion cells here but no clear evidence of such a condition was 

 found in searching my Golgi and Cajal preparations. The com- 

 bined ophthalmic branches of the 5th and 7th nerves pass above 

 the cavity of the nasal capsule in the membrane lining the inner 

 side of the nasal bone (Allis/ 97, fig. 20), while the superior maxil- 

 lary branch of the 5th and the buccalis branch of the 7th nerve 

 send rami beneath the nasal capsule. It may be mentioned in 

 this connection that no ganglion cells were found in Amia on the 

 ophthalmic branch of the 5th nerve anterior to the point where it 

 sends its ramus into the cranial cavity (fig. 25). Yet this may 

 be different in other fishes and probably any branch found entering 

 the cranial cavity of other fishes will be smaller than in Amia on 

 account of the high degree of development of the meninges of 

 the latter. It may be mentioned here that I have found nerve 

 fibers along the blood vessels ventral of the forebrain of Ameiurus 

 in Golgi preparations of young fishes, and that these preparations 

 show evidence of essentially the same innervation of the pineal 

 stalk as was found in Amia. 



THE NERVUS TERMINALIS OF LEPIDOSTEUS AND TELEOSTS 



As has already been mentioned, a ganglion was found on the 

 olfactory nerve of Lepidosteus in a similar position to the one 

 discovered by Allis in Amia. It can be readily recognized in 

 specimens longer than 10 mm., and is located on the ventro-median 

 side of the olfactory nerve. Stages of known age at close intervals 

 have not been available for working out its early embryonic 

 history. To give a detailed account of its later embryology 

 would be to repeat much of what has been said of Amia. Con- 



