542 ALLIS. 
EXPLANATION OF PLATE, XXX. 
Fic. 1. Larval Amia, one day old, showing a stage in the development of the 
lateral line, preceding the appearance of definite sense-organs. X 40. 
Fic. 2. Larva four days old. Sense-organs beginning to appear along the sen- 
sory lines of the head. The double line of the body has not yet completed its growth 
backward. Length 10o™™, Ong: 
Fic. 3a. Larva 40"™ long. Lateral line has reached the rays of the caudal fin; 
and while the formation of sense-organs now begins to advance along the body lines, 
the more anterior organs of the head have already disappeared by inclusion in their 
respective canals. 15; 
Fic. 3. Tail of a larva 21™™ long, showing the extension of the lateral-line organs 
onto the caudal rays. X15. 
Fic. 3c. Tail of an adult Q 22% inches long. Half natural size. 
