1 70 STRONG. [Vol. X. 



a small reenforcing branch to the R. oticus, and a stout branch 

 reenforcing the R. hyoideus of the truncus hyoideomandibularis. 

 This agrees with the course of the branches of the dorsal VII 

 in the tadpole, including the stout branch to the R. hyoideus, 

 which obviously represents the ventral half of the dorsal VII 

 which passes ventrad and unites with the Facialis proper in 

 the tadpole. The fact remains, however, that his Trigeminus 

 II includes the dorsal fine-fibred root from the lobus trigemini, 

 obviously the same root as that known as the dorsal genicu- 

 lated root from the lobus trigemini in Teleosts. 



Wright, in his researches on Ammrus (72), has traced to 

 a considerable extent, the fibres from these various roots. 

 According to him, the bulk of the fibres of the Rr. buccalis, 

 oticus, and ophthalmicus superficialis come from the broad- 

 fibred tuberculum acusticum root or roots, and the motor VII 

 is also reenforced by the latter fibres, and by others " of 

 narrower diameter from the ganglionic complex." The bulk 

 of the R. lateralis trigemini and ophthalmicus (profundus) are 

 derived from the fine-fibred dorsal geniculate root. Besides 

 these branches two strands are formed: an " infero-medial " 

 derived principally, but not exclusively, from the dorsal genic- 

 ulate root, and a " supero-lateral " derived principally from the 

 "broad motor" (.?) "fibres of the ascending and transverse root." 

 From the former strand, and consequently principally from the 

 dorsal geniculate root, come the Rr. palatinus and cutaneus 

 palatinus to the mucous membrane of the roof of the mouth 

 and gill cover ; from the latter strand, and consequently from 

 the ascending and transverse root, a branch proceeds to the 

 muse, abductor mandibulae. These two strands are then re- 

 arranged so that both the R. maxillaris and R. mandibularis 

 receive a portion of each strand. The latter divides into an 

 externus and internus, the internus proceeding along the inner 

 aspect of the jaw and ending in the mandibular barblets, teeth, 

 and mucous membrane, as well as the intermandibular muscle. 

 Wright is probably mistaken in speaking of the ascending and 

 transverse root as motor. The former, ascending part, must 

 be sensory, while the transverse is motor. That the former is 

 not all motor may even be inferred from his own description, 



