Kappers, TeJeostean and Selachian Brain. 87 



upper part of the fasciculus dorsalis. In Lophius this nucleus 

 extends generally in a double row of rather large motor cells, 

 along the lower wall of the ventriculus quartus. By further 

 development these cells are crowded together so that some of them 

 take a more ventral position, while others remain immediately 

 under the floor of the ventricle nearer the sensory terminal 

 nucleus. This is the appearance of the motor region in Gadus, 

 in which I quite agree with C. J. Herrick, who, like myself, 

 failed to observe the origin of motor ninth or tenth fibers from a 

 ventral column as Haller describes it. 



That the most posterior vagus root may be considered as A^. 

 accessorius appears from the investigations of C. J. Herrick, 

 who succeeded in following the course of this root in Menidia into 

 the m. trapezius. 



I will not bring this part to a close without returning to the ques- 

 tion, with what parts of the medulla spinalis the lobi vagi, glosso- 

 pharyngei et facialis sensibilis on the one hand, and the nucleus 

 Rolandt, tubercula acustica (lobus lineae lateralis) and the cere- 

 bellum on the other hand correspond, and the grounds and conse- 

 quences of this correspondence. 



As for the communis region, this passes directly into the sensory 

 splanchnic region of the medulla spinalis. The fact that the 

 sensory fibers of seventh, ninth and tenth are visceral fibers 

 (seventh for taste) is in perfect accord with this. The fact which 

 several investigators of the peripheral nervous system of fishes 

 have been able to state, that the end-buds on the barbels of fishes 

 and on their fins are innervated from this system (C. J. Herrick), 

 would not contradict this visceral character, as Johnston records, 

 whose view I repeat, because these end-buds in his opinion are 

 intended for detection of the composition of the surrounding 

 water and would immediately transfer their impressions to the 

 viscera to regulate their functions. 



The somatic sensory region of the oblongata, on the other hand, 

 which both by its position and by its structure is distinguished from 

 the communis region, evidently forms the continuation of the 

 dorsal horns and the dorsal tracts of the spinal cord. It contains 

 the sensory trigeminus, which actually passes back into the funic- 

 uli posteriores, as well as the octavus region (static region) from 

 which the cerebellum is developed, as is well known since 

 Schaper's work on the subject. This somatic sensory region 



