375 



since Cole has himself, only a few lines previously, quoted from my 

 work the words, that "the nerve in Amia lies behind the spiracular 

 canal"; and he can not doubt that the spiracular canal, which, even in 

 the adult Amia, still opens on the top of the cartilaginous cranium is 

 a part or remnant of the spiracular cleft (No. 28). Moreover, I did 

 not in my work entirely neglect the embryonic conditions, as Cole's 

 remark implies, for, as stated in my introduction, "Nothing is shown in 

 the adult that was not controlled in larvae" ; and the frequent refer- 

 ences to 12 mm larvae indicate the relatively early age of certain spe- 

 cimens included in the investigation. 



In further discussion of this same internal mandibular nerve, Cole 

 says of it, on p. 201, that it practically fulfils the conditions required 

 of a prespiracular branch of the nerve of the hyoid arch ; that is, that 

 "it should pass along the posterior face of the mandibular arch". In 

 point of fact, while the distal half of the nerve lies along the inner 

 surface of the corresponding ramus of the mandible, its proximal half 

 Hes along the outer surface or the anterior edge of elements that are 

 usually considered as belonging to the hyoid arch. Why then should 

 the position of one half of the length of the nerve have such great 

 morphological significance, and that of the remaining half be left wholly 

 out of consideration ? And if the relation of the distal half of a nerve 

 to the mandible is of such great morphological significance why does 

 not this same principle apply also to that branch of branch 4 of the 

 maxillaris inferior trigemini of Amia that I called the ramus mandi- 

 bularis internus trigemini (No. 2. p. 612 and 745 j ? This nerve in 

 Amia is, for some unaccountable reason, wholly overlooked by Cole 

 in his discussion, and yet it is beyond question a prespiracular 

 nerve, is distributed to the inner surface of the mandible, is wholly 

 sensory, and is the one that I regarded as the probable homologue, 

 in whole or in part, of the chorda tympani (No. 2, p. 640, 745 and 

 748), the very nerve the probable homologue of which Cole is seeking 

 in my internal mandibular. 



On p. 147 Cole says, in referring to my description of the ramus 

 pharyngeus glossopharyngei : "This description hardly tallies with 

 plate XXXVIII." In this he is correct. The description tallies with 

 figure 62 plate XXXVII and not with figures 63 and 64, and some 

 explanation of this should have been made by me. It was not always 

 possible, in the dissections, to cleanly separate the two nerves here 

 concerned, and all of the three drawings were first made as shown in 

 figures 63 and 64. A later dissection having shown definitely and 

 distinctly the conditions given in figure 62, that drawing was changed 

 to show them, but corresponding changes in the other two were not 

 made, for they are correct, as they are, for certain dissections, and 

 changes in a complicated drawing already colored are not easily made. 



On p. 153 Cole discusses the role that I, and others, have 

 ascribed to the nervus glossopharyngeus in the innervation of the lateral 

 sense organs , and then calls attention to the confirmation of what he 



