258 Journal of Comparative Neurology. 



is not probable. Furthermore, Siren (Wilder, '91, p. 6'j']^ 

 seems to represent a transition stage in this regard between 

 the typical Urodela and the Anura. Wilder finds the facial 

 (geniculate) ganglion of Siren pushed forward into touch with 

 the Gasserian ganglion. This contact is such that he considers 

 it not improbable that the r. alveolaris receives fibers from the 

 trigeminus. A thorough study of Siren by microscopical 

 methods may throw light upon the fundamental relation of 

 Anura and Urodela with regard to the ganglia in question. 



2. — TJie Ophthalmicus Profundus and M axillaris V. 



Strong ('95, Plate XII, C) has given a reconstruction of 

 the roots and ganglia, and of the proximal portion of the 

 trunks of the fifth and seventh nerves in the Amblystoma 

 larva. With regard to the rami issuing from the Gasserian 

 ganglion and the ganglion of the anterior division of the later- 

 alis VII root, this reconstruction is certainly incorrect. The 

 absence of reference latters, also, leaves doubt as to the author's 

 interpretation of his figure. He represents here two lateralis 

 VII rami which leave their ganglion in union with general 

 cutaneous components from the Gasserian ganglion. In addi- 

 tion to these two rami, he figures a third purely lateralis nerve. 

 Now, the only pure lateralis nerve which goes out of this 

 ganglion is the r. ophthalmicus superficialis VII ; while the 

 only nerve in this region which is composed of lateralis and 

 general cutaneous fibers is the t. infra-orbitalis. The second 

 nerve figured by Strong as composed of lateralis and general 

 cutaneous fibers is not found in Amblystoma. 



In an earlier communication (1901) I have discussed the 

 relation of the r. ophthalmicus profundus and r. maxillaris of 

 Amblystoma to the nerves of the same name in Anura. The 

 essential results and argument of that communication may be 

 summarized as follows : 



1. The r. maxillaris V of Rana is represented in Ambly- 

 stoma by a part of the r. ophthalmicus profundus. 



2. The r. maxillaris V in Amblystoma, by which is 

 meant the general cutaneous nerve more or less fused with the 



