CoGHiLL, Cranial Nerves of Triton. 253 



nerve. I see no reason why these may not be muscle-sensory cells 

 which have passed out from the profundus ganglion to the motor 

 nerve. Yet such cells are found upon the sixth nerve when it has 

 no connection with the ganglion or any branch of the fifth. 



THE FIFTH AND SEVENTH NERVES. 



There is no noteworthy difference, so far as my observations go, 

 between Amblystoma and Triton with respect to the roots and 

 ganglia of the fifth and seventh nerves. With respect to certain 

 of the rami, however, there are some peculiarities which demand 

 notice. 



/. The Ramus Ophthalmicus Profundus V. — The most con- 

 spicuous peculiarity of this nerve is that it passes on the dorsal 

 side of the m. rectus superior and the r. superior III. It passes 

 ventrally of these structures in Amblystoma. 



In the arrangement of the smaller branches of this nerve there 

 are pecuharities which are apparently due to the general topog- 

 raphy of the head, but they do not affect the ultin^ate distribution, 

 which can not be distinguished from that of Amblystoma. The 

 peculiarity of the inferior ciliary nerve has been noticed in con- 

 nection with the r. inferior III. The superior ciliary, as in Amblys- 

 toma, in some cases comes in close relation with the r. superior 

 III, and penetrates the muscle rectus superior, while in other cases 

 it comes in touch with neither this nerve nor the muscle, excepting 

 under the insertion of the latter, where it penetrates the sclera to 

 the interior of the eye. 



The terminal branches of the profundus differ from those of 

 Amblystoma only in unimportant details which are probably 

 incident to skeletal peculiarities. The relation between the ven- 

 tral terminal branch and the palatinus VII is obscure unless the 

 sections are cut in exactly the right plane, and even then it requires 

 close study to determine the exact conditions. It is clear enough 

 that a large bundle of profundus fibers passes through the palatine 

 ganglion and unites with fibers from r. palatinus VII. The result- 

 ing nerve continues cephalad on the mesial side of the internal 

 nares. Some of its fibers seem to terminate in the ventral portion 

 of the nasal epithehum and the nerve lies for the most part within 

 the nasal chamber and is intimately associated with branches of 

 the olfactory nerve at different points. Several small branches 



