GANGLION CELLS OF THE NERVUS TERMINALIS IN 

 THE DOGFISH (MUSTELUS CANIS) 



PAUL S. McKIBBEN 

 From the Anatomical Laboratory of the University of Chicago 



SIX FIGURES 



Within the last few years the nervus terminalis has furnished 

 the material for many observations. This nerve has now been 

 studied in fishes, where it was first described, in amphibians, 

 reptiles and mammals. In a few of these studies, cells have been 

 observed associated with the nerve. In some cases these cells 

 are grouped into well-marked ganglia. 



In Locy's description of the nerve in twenty-seven species 

 of selachians (Locy '05) a well-marked ganglion was found 

 situated on the nerve usually near the olfactory bulb. It was 

 also noted by Locy that there might be two ganglia on a single 

 nerve with minute accessory clusters of cells. 'Tn general 

 structure," Locy ('05) has stated, "one of these ganglia resembles 

 a spinal ganglion." Further, "In the ganglia so far studied, 

 there is a preponderance of bipolar nerve cells, but, in a few cases, 

 other ganglion cells have been observed with angular outlines 

 and three (or more) processes, suggesting the presence of a 

 limited number of multipolar cells." In this study Locy dealt 

 with sections of these ganglia, from Squalus and Alopias, stained 

 by the usual histological methods. 



Through the kindness of the Commissioner of Fisheries and 

 the Director of the Biological Laboratory at the Wood's Hole 

 Station of the United States Bureau of Fisheries, opportunity 

 has been afforded the author for studying the nervus terminalis 

 of the live dogfish. The purpose of the present contribution 

 is to report the appearance of the cells of the ganglion of the 

 nervus terminalis after treatment with methylene blue. 



437 



THE JOURNAL OF COMPARATIVE NEUROLOGY, VOL. 24, NO. 5 

 OCTOBER, 1914 



