136 AYERS. [Vol. VI. 



As Allis (1889, 4) has shown (loc. cit. p. 513), "the facial 

 nerve is the first one of the cranial nerves that takes any part in 

 supplying the regular organs of the lateral canals." 



"The R. ophthalmicus superficialis facialis supplies all the 

 organs of the supra-orbital canal, a separate branch being seiit 

 from the main nerve to each group of organs [italics mine]. 

 This branch pierces the bony canal of the line immediately 

 below the central organ of the group, and after entering the 

 canal, sends a branch to each organ. This is the method of 

 innervation in all the canals." 



(P. 514.) "The R. buccalis facialis supplies the first thirteen 

 organs of the infra-orbital line, and the R. oticus facialis the 

 next three, making sixteen organs in all of this line supplied by 

 the facial, or all those in front of the line of the opercular canal. 

 The re7naining organs of the infra-orbital line are innervated by 

 the glossopharyngeal and vagus. This alone, or together with 

 the branch to organ of supra-orbital, which leaves the main 

 nerve close to it, probably represents the branch which, accord- 

 ing to Wright {p. 513), supplies the organs of the transverse 

 commissure in Mustelus. Wright is inclined to consider this 

 most posterior of the dorsal twigs of the seventh in Mustelus 

 as homologous with the ramus oticus in Ganoids and Teleosts." 



" The sixteen infra-orbital organs supplied by the facial are 

 separated by their innervation . into four distinct groups. The 

 . , . organs Nos. 14, 15, and 16 form the fourth group of the 

 line, and vary somewhat in their method of innervation. Organs 

 15 and 16 are always supplied by branches of the R. oticus 

 facialis. Organ 14 is sometimes supplied by a branch given off 

 by the ramus oticus after it makes its exit on top of the cranium ; 

 but oftener, in specimens examined, it was innervated by a 

 branch which left the nerve close to its origin, or even from 

 the facial ganglion itself, near the root of the oticus, but a little 

 in front of it." 



(P. 516.) "Organ 17 is supplied by the dorsal branch of the 

 glossopharyngeal. This branch arises by a separate root. . . . 

 On this root a separate ganglion is formed, . . . and from it 

 the dorsal nerve mentioned by Wright arises." 



(P. 517.) "The remaining organs of the infra-orbital canal 

 and those of the supra-temporal cross-commissure, as well as 

 the organs of the lateral line, are all supplied by branches arising 



