Herrick, Cranial Nci'ves of the Cod Fish. 269 



cation to the morphological problems which underlie this study, 

 I shall not dwell upon them except in a few cases. 



II. Descriptive Part. 



/. The Trigemino -facial Complex in General. 



As compared with Menidia, the trigemino-facial complex 

 is very compact. The ganglia, except the sympathetic, are 

 almost entirely intra-cranial and they are all crowded together 

 into a single subspherical mass. I merely summarize the ex- 

 perience of previous workers, as well as my own, when I say 

 that the method of dissection is totally inadequate to resolve 

 the intricacy of this entanglement of fibers and cells. Indeed 

 I doubt if I could have been sure of the real meaning of some 

 of my microscopical findings if I had not had before me the sim- 

 pler paradigm given by Menidia. Nevertheless, in spite of the 

 greater apparent intricacy thus introduced, the complex in Ga- 

 dus reduces to a type almost exactly like that of Menidia. 



Thus, the Gasserian ganglion, though intra-cranial, is in all 

 other important respects similar and it gives off the same gen- 

 eral cutaneous nerves as in Menidia. The geniculate ganglion 

 is much more intimately joined to the Gasserian in Gadus, but 

 gives off communis branches in the same way except that this 

 component is absent from the truncus hyomandibularis, but 

 present in the r. mandibularis V. The lateral line roots, gan- 

 glia and nerves are as in Menidia, save for much greater compact- 

 ness, so that the dorsal and ventral lateral line ganglia are only 

 imperfectly separated. All of the rami arising from this gan- 

 glionic complex except the supra-orbital trunk and the r. recur- 

 rens facialis, or facial root of the r. lateralis accessorius, emerge 

 from the cranium by a common foramen. We shall now review 

 the course of each component through the complex. 



2. The Lateral Line Roots of the Facialis. 



This component lies external to all of the other members 

 fo the trigemino-facial complex and is the easiest to analyze. 

 The two lateralis roots emerge from the oblongata together and 

 in very close relations' on the ventral side to the great auditory 



