CoGHiLL, Craiiial Nerves of Auiblystouia. 271 



that the m. cerato-hyoideus externus of Urodela is probably 

 always innervated by the n. facialis. And considering the age 

 of the specimens upon which Bowers reported, it is not im- 

 probable that this apparent exception may not hold (MI further 

 examination, and that this muscle will prove to lie wholly 

 within the territory of the facial nerve. 



6. — The Rami Palatini. 



In my discussion of the r. maxillaris V, I have mentioned 

 the important features in which the r. palatinus of Amblystoma 

 corresponds with that of Rana. These nerves were discussed, 

 also, in my communication upon "The Rami of the Fifth Nerve 

 of Amphibia," where it was shown that they correspond closely 

 in the arrangement of their terminal rami with reference to the 

 internal nares. The branching posteriorly of the internal nares 

 takes place relatively earlier in Rana than in Amblystoma, but 

 in both cases each division anastomoses with a general cuta- 

 neous trigeminal nerve. The lateral branches in the two forms 



o 



innervate morphologically equivalent areas. The same is true 

 of the mesial branches. This relation has not been observed 

 in other Urodela but it is probably typical for both Anura and 

 Urodela. 



The r. palatinus caudaliswas described by Herrick ('94) in 

 A. punctatum under the same name. A corresponding nerve in 

 Necturus is described by Platt ('96, p. 532); and it 

 occurs also in Spelerpes (Bowers). Druner (p. 561) reports 

 a similar nerve in Triton, which he considers as a part of the 

 r. palatinus proper. He does not report it in Proteus, Meno- 

 branchus and Salamandra. 



The nerve which Wilder calls posterior palatine in Siren 

 is of doubtful significance. The peculiar relations of the com- 

 munis component of the facial nerve in Siren, by which the r. 

 alveolaris comes to arise from the r. palatinus and the posterior 

 palatine from the r. alveolaris, obscures the true nature of all 

 these nerves. This obscurity is further increased by Wilder's 

 statement that the posterior palatine gives motor fibers to the 

 m. cerato-hyoideus externus. The nerve seems to pass more 



