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Ad ALLIS. 
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Sul, 
EXPLANATION OF PLATE XXxXI 
Fic. 4. Side view of larva four days old (10™™ lone). The surface organs appear 
X 40. 
in a line above and below the eye. 
Fic. 5. Front view of same larva. 
Fic. 6. Side view of larva six days old (11%™™ long). Lateral-line organs of 
Surface organs multiplying X 40. 
head lying in half-closed canals. 
Fic. 7. Front view of same larva. 
