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CHARLES RROOKOVER 



of the pineal stalk (fig. 30). Kingsbury ('07. a, fig. 4) shows the 

 opening of to the duct of the larval paraphysis. There are many 

 instances in Golgi impregnations that seem tome to show that there 

 is an intrinsic nerve supply to its tubes (fig. 27). Fibers often lie in 

 the closest proximity to the blood vessels on one side and to para- 

 physis tubes on the other. Also, fibers are occasionally found 

 between the tubes of the paraphysis and the ciliated epithelium 

 of the pallium {fig. 27). In the basement membrane of the dorsal 

 and diencephalic sacs there are often found nerve fibers in the 

 same intimate relation with the epithelium on one side and the 



forebrain ventricle 

 X^^N^^cd Lated epithelium 



^■pT; -- jjarapkysis tube 



Fig. 27. Golgi preparation of the meninges of adult Amia showing the relation 

 of the nerve fibers to the paraphysis tubes and to the blood vessels near the pallial 

 covering of the forebrain. X 200. 



blood vessels on the other. The richest supply of nerves is found 

 among the paraphysis tubes to which the majority of the medul- 

 lated fibers entering the cranial cavity were traced. The next 

 richest supply of nerves is furnished to the blood vessles near the 

 ciliated pallial epithelium, but some fibers are found on the walls of 

 the blood vessels in all positions in the cranial cavity. 



The ciliated epithelium just mentioned merits a closer examina- 

 tion into its structure and function. It may be said at the out- 

 set that there is the same essential structure of the pallium of the 



