2/6 Journal of Comparative Neurology. 



tion. There are sometimes fibers to this muscle in Amblystoma 

 which superficially appear to come from the r. communicans but 

 which in serial sections plainly come from the r. jugularis. 



In view, therefore, of the sensory nature of this nerve in 

 Anura (Strong) and in view of the strong evidence which 

 Amblystoma affords of its sensory nature in Urodela also, 

 Druner's interpretation should be received with a considerable 

 degree of caution. 



^. — Jacobson s Anastomosis. 



Jacobson's anastomosis does not occur in Anura, and is 

 not found in some Urodela. Bowers does not find it in 

 Spelerpes. Druner observes nothing akin to it in Salamandra, 

 but finds fusions of branches of the facialis and glossopharyn- 

 geus to the pharyngeal epithelium in Triton, Proteus and Meno- 

 branchus. In Triton (p. 573) the fusion takes place with the 

 major division of the r. palatinus ; in Proteus (p. 591), by a 

 plexus formed with the most caudal branches of the r. palati- 

 nus ; in Menobranchus, between pharyngeal twigs which are 

 not fully defined. 



The anastomosis in Amblystoma is of variable strength, 

 and twigs from the glossopharyngeal nerve may fuse with twigs 

 from the r. palatinus proper. However, the usual strength of 

 the anastomosis indicates that it is typical for Amblystoma. 

 The fusion of twigs from the glossopharyngeal branch to the 

 anastomosis with twigs from the r. palatinus may be accidental, 

 or they may indicate a tendency towards disintegration of the 

 typical anastomosis into a diffuse plexus such as Druner 

 describes for Proteus and Menobranchus, 



This anastomosis as it appears in Amblystoma may have 

 important bearing upon the question which Herrick and Cole 

 (Herrick, '01, p. 194) have raised concerning the anastomosis 

 of the same name in fishes. As the latter anastomosis is 

 described by Herrick and Cole for the cod fish it appears, 

 superficially, to be identical with that of Amblystoma. How- 

 ever, in view of Cole's view concerning the branchiomeric 

 position of the pseudobranch, Herrick ('01, p. 195) says, "if 



