48 The Journal of Comparative Neurology. 



alad, supplying the skin covering m. masseter and the region 

 of the angle of the jaw; it is evidently a general cutaneous 

 branch and may represent Strong's raums accessorius V. The 

 greater part of ramus niandihularis V enters the inferior maxil- 

 lary by a large foramen about one-third the length of the bone 

 from the proximal end. Just before its entrance into the man- 

 dible it divides into two branches, the caudal of which passes 

 directly through the mandible, appearing on the ventral border 

 almost opposite the point of entrance. The foramen of exit 

 is included between the splenial and angular bones. This por- 

 tion of the nerve innervates m. mylohyoideus anterior, and is 

 traceable almost to the symphysis menti, breaking up into sev- 

 eral branches on the ventral surface of the muscle. C. J. Her- 

 rick finds this branch to contain sensory fibres in Amblystoma, 

 and the same is probably true in the case of Cryptobranchus. 

 The branch in question is called rajtms incntalis by von Plessen 

 and Rabinovicz, but, as Herrick states, the name is more prop- 

 erly applied to the ramus we shall next describe. 



The raimis nientalis V is the cephalic one of the two 

 branches which enter the mandible. It divides almost imme- 

 diately into two branches which are separated by the Meckelian 

 cartilage ; the ental branch is the dental nerve and supples the 

 alveolar region ; the other, a larger branch, lies ectad of the 

 Meckelian cartilege and traverses a canal in the dentary bone. 

 Shortly beyond its point of separation from the inner branch it 

 is joined by the ramus alveolaris VII, which enters a foramen 

 in the ectal surface of the dentary bone. The fibres of the two 

 nerves mingle and pass cephalad through the canal above men- 

 tioned, extending almost to the symphysis menti and giving off 

 some half-dozen clusters of small branches which pierce the 

 ectal surface of the dentary bone at intervals and supply the 

 skin of that region. It is not certain as yet whether these fibres 

 to the skin belong to the ramus mentalis V or to the ramus 

 alveolaris VII. 



Netvus Facialis. — The seventh nerve of Cryptobranchus 

 does not exhibit any very important variations from the con- 

 dition generally found in urodeles. In correlation to the well- 



