upon Luminous Animals . 593 
where it passes down between the muscles, c the ends of the 
muscles of the back, d the shell of the corcelet. 
Fig. 19. Represents the elater ignitus. a is the mass of 
luminous substance of one side, seen indistinctly through the 
back part of the semitransparent portion of the corcelet. b is 
the luminous mass of the other side, exposed by removing a 
part of the shell of the corcelet 
MDCCCX. 
Q<l 
