518 H. W. NORMS .AND SALLY P. HUGHES 



in the vicinity of the tentacle (fig. 2). At its final terminations 

 there is much conmiingling and some anastomosing with fibers 

 of the ramus ophthalmicus profundus V. The lateral branch 

 of the ramus maxillaris (figs. 20, 16, 14-8, mx.2), which has no 

 anastomoses with the ramus palatinus VII, is distributed to the 

 skin at the side of the head. 



In Ichthyophis (fig. 19) the lateral division of the maxillaris 

 (mx.2) is the main nerve. The whole of the small medial divi- 

 sion (mx.l) unites with a medial palatine branch (pal.l),th.e 

 combined nerve having a distribution similar to the correspond- 

 ing nerve in Herpele. As in Herpele, a lateral palatine branch 

 {pal2) unites temporarily, if at all, with the maxillaris. 



In Deniiophis the main maxillary nerve divides into a smaller 

 lateral and a larger medial portion. The lateral division passes 

 out to the skin. Two anastomoses of the medial branch occur, 

 much as in Herpele. 



The ramus maxillaris in Geotrypetes does not divide into 

 main medial and lateral branches, but from it there passes ven- 

 trally, medially, and posteriorly around the lateral border of 

 the orbit, a branch that unites with the ramus palatinus VII. 

 Along this anastomosis there also passes, as mentioned in a previ- 

 ous section (p. 508) a small' branch of the ramus mandibularis 

 V (md.l) to innervate the compressor muscle of the orbital glands 

 (fig. 18, md.l + mx.l). At the point where the maxillary branch 

 joins the ramus palatinus, from the latter a small branch (pal. 

 2) runs laterally and anteriorly to join the main maxillaris. In 

 this way there is formed a double anastomosis of palatine and 

 trigeminal elements so characteristic of the Urodela. In the 

 latter, however, the trigeminal component is from the ophthal- 

 micus profundus and not from the maxillaris. The posterior 

 maxillo-palatine anastomosis in Geotrypetes grazes the lateral 

 border of* the profundus ganglion, and possibly a similar condi- 

 tion in Ichthyophis and Siphonops was mistaken by Wieders- 

 heim for an anastomosis between the maxillaris and profundus. 

 The presence of a motor element (md.l) in the anastomosis may 

 explain the supposition of Wiedersheim that the compressor 

 muscle of the orbital glands was innervated through the ramus 

 maxillaris. 



