LATERAL LINE 



eb. 



A. 



pp. 



ps. 



Diagrams showing the relation of the lateral-line canal to the scales on the. trunk oflPerca 

 ftuviatilis, L. A. longitudinal section. B, the scales and the canal seen from the side, a, 

 arch covering the canal ; a.s, anterior region of scale ; ep, epidermis ; l.e, lateral-line cajial ; 

 I. a. lateral-line nerve ; n, nerve to sense-organ ; op, external opening of canal ; p.s, posterior 

 ctenoid edge of scale ; s.o, sense-organ in canal. 



Fig. 195. 



Gadiis morrhm, L. Surface view of the skin, enlarged, showing the lateral line, e.o, cut 

 wall of canal to opening ; c.w, cut wall of main canal ; o, opening ; s, scale ; s.o, sense-organ 

 (neuromast). 



