68 



' ' ''''' 



Figs. 6i--68. Mucous canals (lateral-line organs). 61. Chlamydoselache, groove-like 

 lateral line. (After GAKMAN.) 62. Plan of lateral line of sharks, longitudinal section. 

 63. Plan of sensory end buds (lateral line). 64. Sensory tracts of head of larval Amia. 

 65. Surface openings of tubules of sensory tracts of head of adult Amia. 66. Ramification 

 of sensory tubules in dermal plate of Amia. 67. Cycloid scales of Amia, showing the 

 openings of the tubules of the lateral line. 68. Cycloid scale of the lateral line of Amia, 



(Figs. 64-68 after ALLIS.) 

 * Denotes an outer opening; s- the direction 



showing the course of the sensory tubule. 

 A 7 . Nerve supply. S. Sensory tissue. 

 of an incoming stimulus. 



5 



