328 JOURNAL OF COMPARATIVE NEUROLOGY. 
around to the outer surface of the squamosum. After giv- 
ing a branch to the skin whose destination was undoubtedly 
the lateral line sense organs, it divides into two branches, one! 
passing farther caudad and mesad, so as to lie on the mesal side 
of the lower jaw, between the M. submaxillaris and the skin; 
the other passing to the outer side of the lower jaw. From 
these two branches, evidently the lines of sense organs called 
by me* gular, and oral (incl. angular) respectively, receive their 
innervation. It is possible that the gular division contains com- 
munis fibers as well as those destined for the lateral line organs. 
The M. submaxillaris I find to be innervated by the trigeminus 
(R. mandibularis internus V), in this supporting Miss Pratr* 
as against RuGe.' Both divisions are subcutaneous,—i. e. ex- 
ternal to all skeletal and muscular structure. 
The ramus mandibularis internus, separates from the R. 
mandibularis externus as it leaves its ganglion, and passes ven- 
trad and cephalad, on the inner (ventral) side of the quadrate 
soon passing through the suspensorio-hyoid ligament. This is 
the condition ina specimen g.4 centimeters in length. In 
younger specimens the nerve seems to lie on the outer side of 
the ligament, though very closely applied to it. Beyond the 
' This is evidently the branch described by VON PLESSEN and RABINOVICZ 
(Die Kopfnerven von Salamandra maculosa im vorgeriickten Embryostadium, 
1891) as ‘‘Begleiter des R. hyoideo-mandibularis (h. m’)’’—Hyomandibularis 
accessorius. By some these branches have been incorrectly called Rami man- 
divularis internus (alveolaris) and externus. The homology of either of these 
nerves with the chorda tympani, suggested by HERRICK in his ’94 paper (Am- 
blystoma punctatum) and accepted by KINGSLEY ’o2, for Amphiuma, can, of 
course, hardly hold now. COGHILL calls these, Rami mentales externus and 
internus. 
2 "95, KinGspury, B. F. The Lateral Line System of Sense-organs in some 
American Salamanders, and Comparison with the Dipnoans. Proc. Americ, 
Micr. Soc., Vol. XVII, 1895. 
: 98, Pratt, JULIA B. The Development of the Cartilaginous Skull and 
of the Branchial and Hypoglossal-Musculature in Necturus. A/orph. Jahrb., 
Bd. XXV, 1898. 
*°96, Rucr, G. Ueber das peripherische Gebiet des Nervus facialis bei 
Wirbelthieren. Festschrift fiir Carl Cegenbaur, 1896, pp. 195-348. 
